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WO2018143088A1 - Mélange de poudres pour métallurgie des poudres, et corps fritté ainsi que procédé de fabrication de celui-ci - Google Patents

Mélange de poudres pour métallurgie des poudres, et corps fritté ainsi que procédé de fabrication de celui-ci Download PDF

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Publication number
WO2018143088A1
WO2018143088A1 PCT/JP2018/002495 JP2018002495W WO2018143088A1 WO 2018143088 A1 WO2018143088 A1 WO 2018143088A1 JP 2018002495 W JP2018002495 W JP 2018002495W WO 2018143088 A1 WO2018143088 A1 WO 2018143088A1
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Prior art keywords
powder
alloy steel
iron
mass
steel powder
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PCT/JP2018/002495
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English (en)
Japanese (ja)
Inventor
小林　聡雄
中村　尚道
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JFE Steel Corp
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JFE Steel Corp
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Priority claimed from JP2017251991A external-priority patent/JP6627856B2/ja
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to CN201880009127.6A priority Critical patent/CN110234448B/zh
Priority to KR1020197022897A priority patent/KR102250915B1/ko
Priority to SE1950951A priority patent/SE543167C2/en
Priority to US16/482,120 priority patent/US11414731B2/en
Priority to CA3051387A priority patent/CA3051387C/fr
Publication of WO2018143088A1 publication Critical patent/WO2018143088A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys

Definitions

  • the present invention relates to a mixed powder for powder metallurgy (mixed powder for powder metallurgy), and more particularly to a mixed powder for powder metallurgy having excellent compressibility.
  • the present invention also relates to a sintered body using the mixed powder for powder metallurgy and a method for producing the sintered body.
  • Powder metallurgy technology is a technique that can form parts with complex shapes into shapes that are very close to the product shape (so-called near net shape molding), and that can be manufactured with high dimensional accuracy. Powder metallurgy technology greatly increases cutting costs. Can be reduced. Therefore, powder metallurgy products are used in various fields as various machines and parts.
  • an alloy element having an effect of improving the hardenability is added to the iron-based powder.
  • (1) pre-alloyed steel powder (partially diffusion-alloyed steel powder) and (2) partial diffusion alloy steel powder (partially diffusion-alloyed steel powder) are known. Yes.
  • Prealloyed steel powder is a powder obtained by fully alloying alloying elements in advance.
  • segregation of alloy elements can be completely prevented, so that the structure of the sintered body becomes uniform.
  • complete alloying causes solid solution hardening over the entire grains of the powder, so that the compressibility of the powder is low, and as a result, there is a problem that the molding density is difficult to increase during press molding.
  • Partially diffused alloy steel powder is a powder obtained by partially adhering and diffusing each alloying element powder on the surface of pure iron powder or prealloyed steel powder.
  • Partially diffused alloy steel powder is obtained by mixing a metal powder of an alloy element or its oxide with pure iron powder or prealloyed steel powder and heating it in a non-oxidizing or reducing atmosphere. It is manufactured by diffusion bonding of alloying element powder to the surface of prealloyed steel powder.
  • the partial diffusion alloy steel powder since the structure can be made relatively uniform, the mechanical properties of the product can be stabilized as in the case of using the (1) pre-alloy steel powder.
  • partially diffused alloy steel powder has a portion that does not contain alloy elements or has a small amount of alloy elements, (1) compression during press forming compared to prealloyed steel powder. Excellent in properties.
  • Mo having an effect of improving hardenability is widely used as a basic alloy component used in the above prealloyed steel powder and partially diffused alloy steel powder.
  • Mo, Mn, Cr, Si, and the like are known as alloy elements having an effect of improving hardenability, but since Mo is relatively difficult to oxidize among these elements, it is possible to produce alloy steel powder. This is because it is easy.
  • pre-alloyed steel powder can be easily manufactured by making molten steel added with Mo as an alloy element into powder by a water atomizing method and subjecting it to final reduction in a normal hydrogen atmosphere.
  • a partial diffusion alloy steel powder can be easily produced by mixing Mo oxide with pure iron powder or alloy steel powder and subjecting it to finish reduction in a normal hydrogen atmosphere.
  • Mo having an effect of improving hardenability
  • the formation of ferrite is suppressed during the quenching process, bainite or martensite is generated, and the matrix phase is strengthened by transformation.
  • Mo distributes to the mother phase and strengthens the mother phase in solid solution, and forms fine carbides in the mother phase to strengthen the mother phase by precipitation.
  • Mo has a gas carburizing property and is a non-grain boundary oxidizing element, and therefore has an effect of strengthening carburizing.
  • alloy steel powder using Mo examples include, for example, Patent Documents 1 and 2.
  • Patent Document 1 proposes an alloy steel powder in which Mo is further diffused and adhered to the surface of a pre-alloy steel powder containing Mo as an alloy element.
  • Patent Document 2 it is proposed to apply a twice-molded twice-sintering method in order to further improve the strength of the sintered body when using Mo prealloyed steel powder.
  • the alloy steel powder is once molded and pre-sintered, and then molding and main sintering are performed again.
  • One measure to increase the strength of iron-based powder press-molded products and iron-based powder sintered products is to increase the density.
  • the density By increasing the density, the rearrangement of iron powder particles progresses, the void volume ratio inside the molded product decreases, and the area where iron powder particles come into contact with each other increases.
  • Mechanical properties such as tensile strength, impact value, and fatigue strength of iron-based powder sintered products are improved.
  • the partially diffused alloy steel powder has a part that does not contain an alloy element or has a small amount of alloy element (hereinafter referred to as a “low alloy part”). Compared to pre-alloyed steel powder, it has excellent compressibility during press molding. Although it is considered that the compressibility can be further improved by increasing the proportion of the low alloy portion, it is necessary to diffuse and attach a certain amount of alloy elements in order to bring the characteristics such as hardenability into a desired range. Therefore, the proportion of the low alloy part cannot be increased beyond a certain level, and therefore sufficient compressibility cannot be ensured.
  • This invention is made
  • an object of this invention is to provide the sintered compact using the said mixed powder for powder metallurgy, and its manufacturing method.
  • the present inventors obtained the following knowledge as a result of studies to solve the above-mentioned problems.
  • the root of high compressibility in the partially diffused alloy steel powder is a low alloy part existing inside the particles constituting the partially diffused alloy steel powder, that is, a part that does not contain alloy elements or has a small amount of alloy elements.
  • the low alloy part the solid solution strengthening by the alloy element is small, and deformation is easy during press forming.
  • the alloy element diffuses and adheres to the surface of the particle, the alloy element concentration is high and deformation is difficult.
  • the partially diffused alloy steel powder has a property that the surface is difficult to deform and the inside is easily deformed.
  • the partial diffusion alloy steel powder is more likely to rearrange the particles than the pre-alloy powder, so that the molding density is likely to increase.
  • the surface of the surrounding particles is more It is desirable that it can be deformed according to the shape.
  • the particle surface contains an alloy component, so that the above-described particle surface cannot be soft.
  • the present inventors have conceived to use an iron-based powder not containing Mo and an alloy steel powder containing Mo instead of softening the particle surface.
  • the iron-based powder having a low hardness and containing no Mo the compressibility at the time of press molding is improved even in the normal one-time molding, and the first molding is also performed in the two-time molding-two-time sintering method. Even if the alloy element is diffused by sintering, a portion not containing Mo remains sufficiently, so that high compressibility is maintained even in the second molding.
  • the amount of the iron-based powder not containing Mo is too small, such an effect is insufficient, and conversely if too large, the mechanical properties are degraded.
  • the present invention has been conceived as a result of various studies on conditions that can achieve both compressibility and mechanical properties. That is, the gist configuration of the present invention is as follows.
  • a powder mixture for powder metallurgy (A) an iron-based powder containing Si: 0 to 0.2% by mass and Mn: 0 to 0.4% by mass, the balance being Fe and inevitable impurities, and (b) Mo: 0.3 to 4. Alloy steel powder containing 5% by mass, Si: 0 to 0.2% by mass and Mn: 0 to 0.4% by mass, the balance being Fe and inevitable impurities, Containing
  • the ratio of (b) alloy steel powder to the total of (a) iron-based powder and (b) alloy steel powder is 50 to 90% by mass
  • the mixed powder for powder metallurgy, wherein the ratio of Mo to the total of (a) iron-based powder and (b) alloy steel powder is 0.20 mass% or more and less than 2.20 mass%.
  • (E) contains a lubricant, The ratio of (e) lubricant to the total of (a) iron-based powder, (b) alloy steel powder, (c) Cu powder, and (d) graphite powder is 0.2 to 1.5 mass%. 4. Mixed powder for powder metallurgy according to 3 above.
  • a method for producing a sintered body wherein the mixed powder for powder metallurgy according to any one of the above 1 to 4 is molded and sintered to obtain a sintered body.
  • the mixed powder for powder metallurgy according to the present invention is superior in compressibility to conventional partially diffusion alloy steel powder, and is not limited to the normal one-time molding-one-time sintering method but also the two-time molding-two-time sintering method.
  • a press-molded product having a high molding density can be obtained.
  • strength can be obtained.
  • mixed powder for powder metallurgy in one embodiment of the present invention contains (a) iron-based powder and (b) alloy steel powder as essential components.
  • iron-based powder As the iron-based powder, an iron-based metal powder containing Si: 0 to 0.2% and Mn: 0 to 0.4%, the balance being Fe and inevitable impurities is used.
  • the iron-based powder has an effect of ensuring compressibility during press forming by mixing with the (b) alloy steel powder. Therefore, it is desirable that the iron-based powder is as soft as possible. If an element other than Fe is contained in the iron-based powder, it causes a decrease in compressibility. Therefore, iron powder composed of Fe and inevitable impurities (also referred to as “pure iron powder”) is used as the iron-based powder. It is preferable.
  • general iron-based powder contains Si and Mn as impurities.
  • Si and Mn are elements having an effect of improving hardenability in addition to an effect of improving strength by solid solution strengthening. Therefore, when Si and Mn are included, the strength of the sintered body may be improved depending on the cooling conditions and quenching / tempering conditions when sintering the press-molded product, which may be advantageous. is there.
  • the iron-based powder is allowed to contain one or both of Si and Mn within the range described below.
  • Si 0 to 0.2% Si is an element having an effect of improving the strength of steel by improving hardenability and solid solution strengthening.
  • the Si content in the iron-based powder exceeds 0.2%, the generation of oxide increases, the compressibility decreases, and the oxide becomes a starting point of fracture in the sintered body, resulting in fatigue strength. And reduce toughness. Therefore, the Si content of the iron-based powder is 0.2% or less.
  • the Si content is low from the viewpoint of compressibility, and therefore the Si content may be 0%. Therefore, the Si content of the iron-based powder is 0% or more.
  • Mn 0 to 0.4% Mn, like Si, is an element that has the effect of improving the strength of steel by improving hardenability and strengthening solid solution.
  • Mn content in the iron-based powder exceeds 0.4%, the generation of oxides increases, the compressibility decreases, and the oxides become the starting point of fracture in the sintered body, resulting in fatigue strength. And reduce toughness. Therefore, the Mn content of the iron-based powder is 0.4% or less.
  • the Mn content of the iron-based powder is 0% or more.
  • the amount of inevitable impurities (excluding Si and Mn) contained in the iron-based powder is not particularly limited, but is preferably 1.0% by mass or less in total, and more preferably 0.5% by mass or less. Preferably, it is more preferable to set it as 0.3 mass% or less.
  • the P content is preferably 0.020% or less.
  • the S content is preferably 0.010% or less.
  • the O content is preferably 0.20% or less.
  • the N content is preferably 0.0015% or less.
  • the Al content is preferably 0.001% or less.
  • the Mo content is preferably 0.010% or less.
  • the alloy steel powder contains Mo: 0.3 to 4.5%, Si: 0 to 0.2% and Mn: 0 to 0.4%, with the balance being Fe and inevitable Use alloy steel powder which is an impurity.
  • the alloy steel powder has a role of supplying Mo which is an alloy element.
  • Mo 0.3-4.5%
  • Mo is difficult to oxidize and can be reduced to the same extent as Fe. Therefore, alloy steel powder containing Mo can be manufactured relatively easily.
  • Mo in addition to the effect of strengthening the parent phase during the quenching process due to the effect of improving hardenability, the effect of partitioning into the mother phase to strengthen the solid phase, and forming fine carbides in the parent phase It has the effect of precipitation strengthening the matrix.
  • Mo has a carburizing property and is a non-grain boundary oxidizing element, and therefore has an effect of strengthening carburizing. Therefore, Mo is very useful as a strengthening element.
  • the Mo content as a whole powder metallurgy mixed powder is lower than the original alloy steel powder.
  • the ratio of the alloy steel powder is 50 to 90% as will be described later.
  • the Mo content is 1 ⁇ 2 to 9/10.
  • the Mo content of the alloy steel powder is set to 0.3% or more. If the Mo content is less than 0.3%, the effect of Mo as a strengthening element cannot be sufficiently obtained.
  • the Mo content of the alloy steel powder exceeds 4.5%, the toughness is lowered. Therefore, the Mo content in the alloy steel powder is 4.5% or less.
  • alloy steel powder contains Si and Mn as impurities.
  • Si and Mn are elements having an effect of improving hardenability in addition to an effect of improving strength by solid solution strengthening. Therefore, when Si and Mn are included, the strength of the sintered body may be improved depending on the cooling conditions and quenching / tempering conditions when sintering the press-molded product, which may be advantageous. is there.
  • the alloy steel powder is allowed to contain one or both of Si and Mn within the range described below.
  • Si 0 to 0.2% Si is an element having an effect of improving the strength of steel by improving hardenability and solid solution strengthening.
  • the Si content in the alloy steel powder exceeds 0.2%, the generation of oxides increases, the compressibility decreases, and the oxides become the starting point of fracture in the sintered body, resulting in fatigue strength. And reduce toughness. Therefore, the Si content of the alloy steel powder is 0.2% or less.
  • the Si content is set to 0% or more.
  • Mn 0 to 0.4% Mn, like Si, is an element that has the effect of improving the strength of steel by improving hardenability and strengthening solid solution.
  • Mn content in the alloy steel powder exceeds 0.4%, the generation of oxides increases, the compressibility decreases, and the oxides become the starting point of fracture in the sintered body, resulting in fatigue strength. And reduce toughness. Therefore, the Mn content of the alloy steel powder is set to 0.4% or less.
  • the Mn content of the alloy steel powder is 0% or more.
  • the amount of inevitable impurities (excluding Si and Mn) contained in the alloy steel powder is not particularly limited, but is preferably 1.0% by mass or less in total, and more preferably 0.5% by mass or less. Preferably, it is more preferable to set it as 0.3 mass% or less.
  • the P content is preferably 0.020% or less.
  • the S content is preferably 0.010% or less.
  • the O content is preferably 0.20% or less.
  • the N content is preferably 0.0015% or less.
  • the Al content is preferably 0.001% or less.
  • the alloy steel powder is not particularly limited, and any alloy powder having the above component composition can be used.
  • the alloy steel powder can be one or both of a pre-alloy steel powder and a partially diffusion alloy steel powder.
  • the partial diffusion alloy steel powder one or both of those obtained by diffusing and adhering alloy elements on the surface of iron powder (pure iron powder) and those obtained by diffusing and adhering alloy elements on the surface of prealloyed steel powder are used. Can be used.
  • Alloy steel powder ratio 50-90%
  • the ratio of the mass of (b) alloy steel powder to the total mass of (a) iron-based powder and (b) alloy steel powder (hereinafter simply referred to as “alloy steel powder ratio”) is 50 to 90%.
  • the ratio of alloy steel powder is less than 50%, that is, when the ratio of iron-based powder exceeds 50%, the iron-based powder portion having low strength is connected inside the sintered body, and the strength of the sintered body is increased when stressed. Cracks develop in the lower part and it tends to break. Therefore, the ratio of alloy steel powder is 50% or more.
  • the ratio of the alloy steel powder exceeds 90%, that is, the ratio of the iron-based powder is less than 10%, the soft part contributing to the compressibility will decrease, and the compressibility of the mixed powder as a whole will be insufficient. To do. Therefore, the ratio of alloy steel powder is 90% or less. Further, since the tensile strength of the sintered body tends to become maximum when the ratio of the alloy steel powder is about 80%, the ratio of the alloy steel powder is preferably 70 to 90%.
  • Mo ratio 0.20% or more and less than 2.20%
  • Mo ratio The ratio of the mass of Mo to the total mass of (a) iron-based powder and (b) alloy steel powder (hereinafter simply referred to as “Mo ratio”) is If it is less than 0.20%, the effect of Mo as a strengthening element becomes insufficient. Therefore, the Mo ratio is 0.20% or more. On the other hand, excessive addition of Mo leads to an increase in alloy cost, so the Mo ratio is less than 2.20%.
  • the mixed powder for powder metallurgy in one embodiment of the present invention may be composed of only (a) iron-based powder and (b) alloy steel powder (iron-based powder + alloy steel powder: 100%) Any other ingredients can also be included.
  • the ratio of the total mass of (a) iron-based powder and (b) alloy steel powder to the total mass of the powder mixture for powder metallurgy is not particularly limited and can be any value. However, by increasing the ratio, the mechanical properties of the sintered body can be further improved. Therefore, the ratio of the total mass of (a) iron-based powder and (b) alloy steel powder to the total mass of the powder mixture for powder metallurgy is preferably 90% or more, and more preferably 95%. On the other hand, the upper limit of the ratio is not particularly limited, and may be 100%.
  • (c) Cu powder and (d) graphite powder can be further added to the mixed powder for powder metallurgy.
  • the strength of the sintered body can be further improved.
  • Cu powder Cu is an element having an action of promoting solid solution strengthening and hardenability improvement of the iron-based powder and increasing the strength of the sintered body. If the added amount of Cu powder is less than 0.5%, the above-described effect cannot be obtained sufficiently. Therefore, when using Cu powder, the added amount of Cu powder is set to 0.5% or more. The amount of Cu powder added is preferably 1.0% or more. On the other hand, if the added amount of Cu powder exceeds 4.0%, not only the strength improvement effect of the sintered part is saturated, but also the sintered density is lowered. Therefore, the addition amount of Cu powder is 4.0% or less. The amount of Cu powder added is preferably 3.0% or less.
  • “addition amount of Cu powder” here is (c) Cu powder with respect to the total mass of (a) iron base powder, (b) alloy steel powder, (c) Cu powder, and (d) graphite powder. The mass ratio.
  • (D) Graphite powder Graphite (graphite) is an effective component for increasing the strength. If the added amount of graphite powder is less than 0.2%, the above effect cannot be obtained sufficiently. Therefore, when using graphite powder, the amount of graphite powder added is 0.2% or more. The amount of graphite powder added is preferably 0.3% or more. On the other hand, when the amount of graphite powder added exceeds 1.0%, the amount of cementite precipitated due to hypereutectoid increases, leading to a decrease in strength. Therefore, the amount of graphite powder added is 1.0% or less. The amount of graphite powder added is preferably 0.8% or less.
  • “addition amount of graphite powder” means (d) graphite powder with respect to the total mass of (a) iron-based powder, (b) alloy steel powder, (c) Cu powder, and (d) graphite powder. The mass ratio.
  • a lubricant can be further added to the powder mixture for powder metallurgy.
  • a lubricant it is possible to reduce the friction when press-molding the mixed powder for powder metallurgy, extend the life of the mold, and further increase the density of the compact.
  • (E) Lubricant When the addition amount of the lubricant is less than 0.2%, the above effect is hardly exhibited. Therefore, when a lubricant is used, the amount of the lubricant added is 0.2% or more. The addition amount of the lubricant is preferably 0.3% or more. On the other hand, when the addition amount of the lubricant exceeds 1.5%, the non-metallic portion in the mixed powder increases, the molding density is hardly increased, and the strength is lowered. Therefore, the addition amount of the lubricant is set to 1.5% or less. The addition amount of the lubricant is preferably 1.2% or less.
  • the “addition amount of lubricant” means (e) the total mass of (a) iron-based powder, (b) alloy steel powder, (c) Cu powder, and (d) graphite powder. The mass ratio.
  • the lubricant is not particularly limited, and any lubricant can be used.
  • the lubricant for example, one or more selected from the group consisting of fatty acids, fatty acid amides, fatty acid bisamides, and metal soaps can be used. Among them, it is preferable to use a metal soap such as lithium stearate or zinc stearate, or an amide-based lubricant such as ethylene bisstearamide.
  • a method of directly applying the lubricant to the mold can be used, and a method of combining both can also be used.
  • a sintered body can be produced using the powder mixture for powder metallurgy.
  • the method for producing the sintered body is not particularly limited and can be produced by an arbitrary method. Usually, according to a conventional method in powder metallurgy, a powder mixture for powder metallurgy is press-molded to form a compact, and then, What is necessary is just to sinter.
  • the density of the molded body (sometimes referred to as “molding density”) is not particularly limited, but is 7.00 Mg / m 3 or more from the viewpoint of ensuring sufficient mechanical properties (toughness, etc.). Is preferred. Moreover, although the tensile strength calculated
  • Example 1 A mixed powder for powder metallurgy was produced using iron-based powder and alloy steel powder containing Si and Mn only as inevitable impurities, and the performance was evaluated.
  • the specific procedure is as follows.
  • the iron-based powder was subjected to a final reduction treatment at 900 ° C. for 60 minutes in a hydrogen atmosphere for decarburization and deoxidation on the iron powder produced by the water atomization method. It was manufactured by crushing.
  • the component composition of the obtained iron-based powder is shown in Table 1. Each element shown in Table 1 is contained as an inevitable impurity in the iron-based powder.
  • the pre-alloyed steel powder was produced by the same method as the iron-based powder except that a metal containing Mo was used as the molten metal for water atomization. As a result, an alloy steel powder to which all Mo as an alloy element was added as a pre-alloy was obtained.
  • the component composition of the obtained alloy steel powder is shown in Table 1.
  • the composite type alloy steel powder is manufactured in the same manner as the above prealloyed steel powder by producing a prealloyed steel powder containing 1.5% by mass of Mo, and Mo is further diffused on the surface of the obtained prealloyed steel powder. Manufactured by attaching. In the diffusion adhesion, the prealloyed steel powder is mixed with 0.4 mass%, 0.7 mass%, 1.0 mass%, 1.4 mass%, 2.3 mass%, 5.4 mass% Mo. Each was mixed with MoO 3 powder corresponding to the content, and heat-treated at 900 ° C. for 60 minutes in a hydrogen atmosphere.
  • the prealloyed steel powder was decarburized and deoxidized, and Mo produced by the reduction of MoO 3 was diffused and adhered to the prealloyed steel powder.
  • a composite alloy steel powder in which Mo was diffused and adhered to the surface of the prealloyed steel powder was obtained.
  • the component composition of the obtained composite type alloy steel powder is shown in Table 1 together.
  • the obtained (a) iron-based powder and (b) alloy steel powder are mixed for 15 minutes by a V-type mixer in the combinations and ratios shown in Table 2, and the mixed powder of iron-based powder and alloy steel powder is obtained. Obtained.
  • the mixing ratio of (a) iron-based powder and (b) alloy steel powder is such that the ratio of Mo to the total of (a) iron-based powder and (b) alloy steel powder is 0.3% by mass and 2.0%.
  • the calculated value of the ratio of Mo is shown in Table 2 with the aim of becoming mass%.
  • Cu powder, graphite powder, and Wax lubricant powder are added to the mixed powder of the iron-based powder and alloy steel powder in the proportions shown in Table 2, and mixed for 15 minutes with a V-type mixer. A mixed powder was obtained. In addition, No. In 1-3, only the lubricant was added without using Cu powder and graphite powder.
  • the characteristics of the obtained powder mixture for powder metallurgy were evaluated by the following procedure.
  • a press-molded body as a test piece was prepared, and the density was evaluated.
  • the press-molded body was in the form of a ring having an outer diameter of 38 mm ⁇ , an inner diameter of 25 mm ⁇ , and a height of 10 mm, and the molding pressure was 686 MPa.
  • the weight of the obtained molded body was measured, and the density was determined by dividing by the volume calculated from the dimensions. The results were as shown in Table 2.
  • a sintered body as a tensile test piece was prepared from each of the mixed powders for powder metallurgy, and the tensile strength was measured.
  • the tensile test piece is obtained by forming the mixed powder for powder metallurgy into a tensile test piece having a parallel portion with a width of 5.8 mm and a height of 5 mm and performing a sintering process at 1130 ° C. for 20 minutes in an RX gas atmosphere. Produced. The results are shown in Table 2.
  • Example 2 A mixed powder for powder metallurgy was produced in the same manner as in Example 1 except that iron-based powder containing Mn and alloy steel powder were used, and the performance was evaluated.
  • Table 3 shows the composition of the iron-base powder and alloy steel powder used, and Table 4 shows the blending ratio of each component and the evaluation results.
  • Example 1 As can be seen from the results shown in Table 4, as in Example 1, the mixing ratio of the iron-based powder increases, the molding density increases, and the tensile strength decreases once after increasing. In the example satisfying the conditions of the present invention, a molding density of 7.00 Mg / m 3 or more and a tensile strength of 500 MPa or more are obtained.
  • Example 3 A mixed powder for powder metallurgy was produced in the same manner as in Example 1 except that iron-based powder and alloy steel powder containing Si and Mn were used, and the performance was evaluated.
  • Table 5 shows the composition of the iron-base powder and alloy steel powder used, and Table 6 shows the blending ratio of each component and the evaluation results.

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Abstract

L'invention fournit un mélange de poudres pour métallurgie des poudres qui présente une compressibilité supérieure à une poudre d'acier allié partiellement dispersée, et qui permet d'obtenir une densité de moulage élevée. Plus précisément, l'invention concerne un mélange de poudres pour métallurgie des poudres qui comprend : (a) une poudre à base de fer qui comprend 0 à 0,2% en masse de Si et 0 à 0,4% en masse de Mn, le reste étant du Fe et des impuretés inévitables ; et (b) une poudre d'acier allié qui comprend 0,3 à 4,5% en masse de Mo, 0 à 0,2% en masse de Si, et 0 à 0,4% en masse de Mn, et le reste étant du Fe et des impuretés inévitables. Le rapport de la poudre d'acier allié (b) vis-à-vis du total de ladite poudre à base de fer (a) et de ladite poudre d'acier allié (b), est compris entre 50 et 90% en masse. Le rapport de Mo vis-à-vis du total de ladite poudre à base de fer (a) et de ladite poudre d'acier allié (b), est supérieur ou égal à 0,20% en masse et inférieur à 2,20% en masse.
PCT/JP2018/002495 2017-02-02 2018-01-26 Mélange de poudres pour métallurgie des poudres, et corps fritté ainsi que procédé de fabrication de celui-ci Ceased WO2018143088A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201880009127.6A CN110234448B (zh) 2017-02-02 2018-01-26 粉末冶金用混合粉、烧结体及烧结体的制造方法
KR1020197022897A KR102250915B1 (ko) 2017-02-02 2018-01-26 분말 야금용 혼합분, 소결체, 및 소결체의 제조 방법
SE1950951A SE543167C2 (en) 2017-02-02 2018-01-26 Mixed powder for powder metallurgy, sintered body, and method for producing sintered body
US16/482,120 US11414731B2 (en) 2017-02-02 2018-01-26 Mixed powder for powder metallurgy, sintered body, and method for producing sintered body
CA3051387A CA3051387C (fr) 2017-02-02 2018-01-26 Melange de poudres pour metallurgie des poudres, et corps fritte ainsi que procede de fabrication de celui-ci

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JP2017-017878 2017-02-02
JP2017017878 2017-02-02
JP2017251991A JP6627856B2 (ja) 2017-02-02 2017-12-27 粉末冶金用混合粉および焼結体の製造方法
JP2017-251991 2017-12-27

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CN113677459A (zh) * 2019-04-05 2021-11-19 杰富意钢铁株式会社 粉末冶金用铁基混合粉末和铁基烧结体

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JPS6479303A (en) * 1987-09-21 1989-03-24 Daido Steel Co Ltd Low-alloy steel powder for sintering
JP2016108651A (ja) * 2014-12-05 2016-06-20 Ｊｆｅスチール株式会社 粉末冶金用合金鋼粉および焼結体

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JPS6479303A (en) * 1987-09-21 1989-03-24 Daido Steel Co Ltd Low-alloy steel powder for sintering
JP2016108651A (ja) * 2014-12-05 2016-06-20 Ｊｆｅスチール株式会社 粉末冶金用合金鋼粉および焼結体

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113677459A (zh) * 2019-04-05 2021-11-19 杰富意钢铁株式会社 粉末冶金用铁基混合粉末和铁基烧结体
US12378645B2 (en) 2019-04-05 2025-08-05 Jfe Steel Corporation Iron-based mixed powder for powder metallurgy and iron-based sintered body

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