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WO2013035351A1 - Composition d'alliage pour un moule de coulée sous pression d'aluminium et son procédé de fabrication - Google Patents

Composition d'alliage pour un moule de coulée sous pression d'aluminium et son procédé de fabrication Download PDF

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Publication number
WO2013035351A1
WO2013035351A1 PCT/JP2012/053051 JP2012053051W WO2013035351A1 WO 2013035351 A1 WO2013035351 A1 WO 2013035351A1 JP 2012053051 W JP2012053051 W JP 2012053051W WO 2013035351 A1 WO2013035351 A1 WO 2013035351A1
Authority
WO
WIPO (PCT)
Prior art keywords
alloy
aluminum
mold
alloy composition
die
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/053051
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English (en)
Japanese (ja)
Inventor
千葉　晶彦
云平 李
寧 唐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tohoku University NUC
Original Assignee
Tohoku University NUC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tohoku University NUC filed Critical Tohoku University NUC
Priority to JP2013532462A priority Critical patent/JP6086444B2/ja
Publication of WO2013035351A1 publication Critical patent/WO2013035351A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/07—Alloys based on nickel or cobalt based on cobalt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B22C9/061—Materials which make up the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2209—Selection of die materials
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon

Definitions

  • the present invention relates to an alloy composition for an aluminum die-casting mold, which has low reactivity with molten aluminum and is suitable as a mold material for an aluminum die-casting product, and a method for producing the same.
  • a special steel such as JIS SKD61 which is excellent in high-temperature tensile strength, is generally used as a material for a die of aluminum die-cast (hereinafter also referred to as aluminum die-cast).
  • the conventional mold material mainly composed of iron has high reactivity with the molten aluminum, and in particular, in the sleeve portion of the mold where the contact time with the molten aluminum is long, the iron component is a mixture of the molten aluminum. It reacts to become an intermetallic compound, and as a result, the phenomenon that the mold material melts into the molten aluminum occurs, the mold cannot be used in a short time, and the mold needs to be replaced frequently. There was a problem that there was.
  • the present invention has been made paying attention to such problems, and the raw material cost is slightly higher than that of the iron-based alloy, but the mold life is long, and as a result, the number of times of mold replacement is reduced.
  • An aluminum die-casting die that uses a Co—Cr—Mo-based alloy having low reactivity with molten aluminum, optimizes its chemical composition, and further forms a composition on the surface that is not soluble in molten aluminum by surface treatment It is an object of the present invention to provide an alloy composition and a method for producing the same.
  • Si, Mn, Fe, Zr, C, N, and / or inevitable impurities are preferably less than 1% by weight.
  • an alloy composition for an aluminum die-cast mold which is characterized by comprising an fcc ⁇ phase, an hcp ⁇ phase, or a mixed crystal phase thereof.
  • a method for producing an alloy composition for cast molds is obtained.
  • the raw material cost is slightly higher than that of the iron-based alloy, but the mold life is long, and as a result, the number of times of mold replacement is reduced.
  • To provide an alloy composition for an aluminum die-casting die, which uses a Mo-based alloy optimizes its chemical composition, and further forms a composition on the surface that does not dissolve in molten aluminum by surface treatment, and a method for producing the same. it can.
  • the Co—Cr—Mo alloy for aluminum die casting has better thermal fatigue resistance than conventional iron alloys, the corrosion resistance of the die for aluminum die casting manufactured using this alloy can be improved. it can.
  • the Co—Cr—Mo alloy for aluminum die casting is effective as a die casting die for zinc and magnesium in addition to an aluminum die casting die.
  • the X-ray diffraction analysis results of the surface before and after the high temperature oxidation treatment of the Co-29Cr-6Mo-0.14N alloy in the method for producing an alloy composition for an aluminum die-cast mold according to the embodiment of the present invention are shown. It is a graph to show. It is the microscope picture of the (a) surface after the atmospheric oxidation process which shows the alloy composition for aluminum die-casting molds of embodiment of this invention, (b) cross section. It is the microscope picture of the surface (Surface) and cross section (Cross section) after the oxidation process in air
  • Co-Cr-Mo-0.14N alloy which is an alloy composition for an aluminum die-casting mold according to an embodiment of the present invention after unheated and oxidized in air, is placed in a molten aluminum at 720 ° C. for 1 hour. It is a microscope picture which shows the cross section after being immersed. It is a graph which shows the time change of cross-sectional thickness when each alloy shown in FIG. 5 is immersed in the molten metal of 720 degreeC aluminum.
  • FIG. 4 is a photomicrograph showing a cross section after an untreated Co—Cr—Mo—0.14N alloy is immersed in a molten aluminum at 720 ° C. for 1 hour.
  • Cross section after immersing Co—Cr—Mo—0.14N alloy which is an alloy composition for an aluminum die-casting mold according to an embodiment of the present invention, after oxidation in air for 2 hours in molten aluminum at 720 ° C.
  • FIG. 1 is a result of XRD (X-ray diffraction) analysis before and after high-temperature oxidation treatment of a Co-29Cr-6Mo-0.14N alloy according to an embodiment of the present invention at 750 ° C. for 24 hours in the atmosphere.
  • a low temperature stable HCP is obtained from a ⁇ phase having a FCC crystal structure stable at a high temperature while oxidizing a Co—Cr—Mo—0.14N alloy at a phase transformation point (850 ° C.) or lower.
  • a phase transformation of the crystal structure to the ⁇ phase occurs.
  • the oxide formed on the surface is a (Cr.M) 2 O 3 oxide mainly containing Cr.
  • M is another element (Co, Si, Mo, etc.) contained in the alloy.
  • FIG. 2 shows a surface structure after the Co—Cr—Mo—0.14N alloy (CCM alloy) according to the embodiment of the present invention is oxidized in the atmosphere at 750 ° C. for 24 hours. As shown in FIG. 2, it can be confirmed that the oxide on the surface is uniformly formed with an average particle diameter of 100 to 500 nm. The oxide film is dense with no pores. After oxidation in the atmosphere at 750 ° C. for 24 hours, the thickness of the oxide film (Oxide layer) is at the 300 to 400 nm level.
  • CCM alloy Co—Cr—Mo—0.14N alloy
  • FIG. 3 shows the oxidation treatment of the Co—Cr—Mo—0.14N alloy according to the embodiment of the present invention at 600 ° C. for 24 hours (T600-24h) and 800 ° C. for 24 hours (T800-24h), respectively. It is the surface texture after the execution.
  • the oxide film (Oxide layer) heat-treated at 600 ° C. for 24 hours has many surface defects (holes), the film is thin, and the oxidized film is thinner than the result at 800 ° C. for 24 hours.
  • the crystal grain size of the product is fine. From this, it is considered that by performing the oxidation treatment at a high temperature and increasing the thickness of the oxide film, it is possible to more effectively prevent the mold from melting into the molten aluminum.
  • FIG. 4 shows a Co—Cr—Mo—0.14N alloy with different roughness on the sample surface, according to an embodiment of the present invention, at 600 ° C. for 24 hours (T600-24h) and 800 ° C. for 24 hours ( This is a surface texture after oxidation treatment at T800-24h).
  • the oxide film is formed more uniformly in the sample that has been subjected to oxidation treatment by moderately roughing the surface of the sample, but in the sample after oxidation treatment at a high temperature (800 ° C.) This trend is not clearly seen.
  • FIG. 5 shows that a Co—Cr—Mo—0.14N alloy (thickness 2 mm) after 750 ° C. and 24 hours oxidation treatment according to an embodiment of the present invention is used as an aluminum melt at 720 ° C. It is a cross-sectional structure after time immersion.
  • FIG. 6 shows the time change of the thickness of the cross section of the sample when those samples were immersed in the molten metal of 720 ° C. As shown in FIGS. 5 and 6, the thickness (X) of the untreated sample is greatly reduced, but the thickness of the sample after the oxidation treatment (Treated sample) is not changed, and the mold is made of aluminum. It is very effectively prevented from melting into the molten metal.
  • FIG. 7 shows a cross-sectional structure after immersing an untreated Co—Cr—Mo—0.14N alloy in molten aluminum at 720 ° C. for 1 hour.
  • the surface of the sample and the molten aluminum react vigorously, and the Co—Cr—Mo is formed between the Co—Cr—Mo—0.14N alloy (CCM alloy) and the molten aluminum (Al).
  • CCM alloy Co—Cr—Mo—0.14N alloy
  • Al molten aluminum
  • a metal compound of -Al is formed, and the Cr-Mo-Al phase is dispersed in the molten aluminum.
  • composition (at%) of the Co—Cr—Mo—Al metal compound is about 83.5Al-10.86Co-4.94Cr-0.71Mo, and the composition of the dispersed Cr—Mo—Al phase is 7.12Cr-2.22Mo-89.97Al.
  • FIG. 8 shows a structure of a cross-section after immersing a Co—Cr—Mo—0.14N alloy oxidized at 750 ° C. for 24 hours in an aluminum melt at 720 ° C. for 2 hours according to an embodiment of the present invention. It is.
  • a direct reaction occurs between the alloy and the molten aluminum, The metal compound described with reference to FIG. 7 is formed and expansion occurs, and a cone-shaped structure (cone-shaped structure) is formed.
  • the sleeve material of the aluminum alloy molten metal injection device was made of the developed alloy (Co-29Cr-6Mo-0.05C-0.05Zr-0.14N alloy).
  • a sleeve material for an aluminum alloy molten metal injection device was manufactured using JIS SKD61 steel.
  • the molten aluminum alloy was 700 ° C.
  • the SKD61 sleeve cracked after 35,000 shots, but the developed alloy sleeve was usable even after 380,000 shots. From this, it was found that the developed alloy is excellent as a through material for aluminum die casting.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

L'invention concerne une composition d'alliage pour un moule de coulée sous pression d'aluminium, fabriquée par maintien d'un alliage à base de Co-Cr-Mo qui consiste en 60 à 70 % en masse de Co, 25 à 33 % en masse de Cr, et 4 à 7 % en masse de Mo, le complément consistant en Si, Mn, Fe, Zr, C, N et/ou les impuretés inévitables, dans l'atmosphère à une température de 600 à 900 °C pendant 0,5 à 5 heures pour oxyder la surface de celle-ci, et consistant en une phase γ fcc, une phase ε hcp ou un mélange des deux. L'invention porte également sur un procédé de fabrication de cette composition.
PCT/JP2012/053051 2011-09-08 2012-02-10 Composition d'alliage pour un moule de coulée sous pression d'aluminium et son procédé de fabrication Ceased WO2013035351A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013532462A JP6086444B2 (ja) 2011-09-08 2012-02-10 アルミニウムダイキャスト金型用合金組成物およびその製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011195781 2011-09-08
JP2011-195781 2011-09-08

Publications (1)

Publication Number Publication Date
WO2013035351A1 true WO2013035351A1 (fr) 2013-03-14

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PCT/JP2012/053051 Ceased WO2013035351A1 (fr) 2011-09-08 2012-02-10 Composition d'alliage pour un moule de coulée sous pression d'aluminium et son procédé de fabrication

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JP (1) JP6086444B2 (fr)
WO (1) WO2013035351A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103952596A (zh) * 2014-05-12 2014-07-30 四川省有色冶金研究院有限公司 一种用于金属增材制造的钴铬钼合金粉体及其制备方法
CN106282671A (zh) * 2016-08-29 2017-01-04 深圳市圆梦精密技术研究院 Co‑Cr‑Mo合金、微创手术刀的加工方法和微创手术刀

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004269994A (ja) * 2003-03-11 2004-09-30 Japan Science & Technology Agency 生体適合性Ｃｏ基合金及びその製造方法
JP2006265633A (ja) * 2005-03-24 2006-10-05 Iwate Univ ＭＲＩ対応生体用Ｃｏ−Ｃｒ−Ｍｏ合金およびその製造方法
JP2008038179A (ja) * 2006-08-03 2008-02-21 Hiroshi Kai ホットチャンバーダイカストマシンとその鋳造方法
WO2010026996A1 (fr) * 2008-09-05 2010-03-11 国立大学法人東北大学 PROCÉDÉ DE FORMATION DE FINS GRAINS CRISTALLINS DANS UN ALLIAGE DE Co-Cr-Mo DOPÉ À L'AZOTE ET ALLIAGE DE Co-Cr-Mo DOPÉ À L'AZOTE
JP2010215960A (ja) * 2009-03-16 2010-09-30 Iwate Univ 機械部品の製造方法及び機械部品

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004269994A (ja) * 2003-03-11 2004-09-30 Japan Science & Technology Agency 生体適合性Ｃｏ基合金及びその製造方法
JP2006265633A (ja) * 2005-03-24 2006-10-05 Iwate Univ ＭＲＩ対応生体用Ｃｏ−Ｃｒ−Ｍｏ合金およびその製造方法
JP2008038179A (ja) * 2006-08-03 2008-02-21 Hiroshi Kai ホットチャンバーダイカストマシンとその鋳造方法
WO2010026996A1 (fr) * 2008-09-05 2010-03-11 国立大学法人東北大学 PROCÉDÉ DE FORMATION DE FINS GRAINS CRISTALLINS DANS UN ALLIAGE DE Co-Cr-Mo DOPÉ À L'AZOTE ET ALLIAGE DE Co-Cr-Mo DOPÉ À L'AZOTE
JP2010215960A (ja) * 2009-03-16 2010-09-30 Iwate Univ 機械部品の製造方法及び機械部品

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103952596A (zh) * 2014-05-12 2014-07-30 四川省有色冶金研究院有限公司 一种用于金属增材制造的钴铬钼合金粉体及其制备方法
CN103952596B (zh) * 2014-05-12 2016-03-23 四川省有色冶金研究院有限公司 一种用于金属增材制造的钴铬钼合金粉体制备方法
CN106282671A (zh) * 2016-08-29 2017-01-04 深圳市圆梦精密技术研究院 Co‑Cr‑Mo合金、微创手术刀的加工方法和微创手术刀

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JP6086444B2 (ja) 2017-03-01

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