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EP2761044A2 - Nickel alloy - Google Patents

Nickel alloy

Info

Publication number
EP2761044A2
EP2761044A2 EP12775775.5A EP12775775A EP2761044A2 EP 2761044 A2 EP2761044 A2 EP 2761044A2 EP 12775775 A EP12775775 A EP 12775775A EP 2761044 A2 EP2761044 A2 EP 2761044A2
Authority
EP
European Patent Office
Prior art keywords
weight
nickel
based alloy
alloy
alloy according
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.)
Granted
Application number
EP12775775.5A
Other languages
German (de)
French (fr)
Other versions
EP2761044B1 (en
Inventor
Karine DESCHANDOL
Nicole FOUCARD
Michel RAGUET
François TIEVANT
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.)
Safran Aircraft Engines SAS
Original Assignee
SNECMA SAS
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 SNECMA SAS filed Critical SNECMA SAS
Publication of EP2761044A2 publication Critical patent/EP2761044A2/en
Application granted granted Critical
Publication of EP2761044B1 publication Critical patent/EP2761044B1/en
Active legal-status Critical Current
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Classifications

    • 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
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/057—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being less 10%

Definitions

  • the subject of the invention is a nickel-based alloy.
  • the alloy proposed herein comprises, in a nickel base, from 9.5% to 9.90% by weight of cobalt, from 8.70% to 9.00% by weight of chromium, from , 65% to 7.05% by weight of tungsten, from 3.67% to 3.87% by weight of tantalum, from 1.77% to 1.97% by weight of molybdenum, from 0.10% to 0% by weight. 12% by weight of carbon; and it differs from the conventional composition of René 125 by contents of 4.80% to 5.00% by weight of aluminum, from 1.48% to 1.52% by weight of hafnium, 2.28% to 2.33% by weight of titanium, from 0.0005% to 0.01% by weight of boron.
  • the alloy does not in principle include other ingredients, except at levels much lower than those mentioned so far, or only in the form of traces or impurities. It is thus emphasized in particular that zirconium, which is quite abundant in René 125, is completely or almost completely removed from the present alloy (at most 0.007% by weight), as is phosphorus and sulfur (at most 0.001% by weight). each) . Certain other criteria corresponding to secondary aspects of the invention can still be advantageously respected as will be detailed below.
  • This alloy is much more resistant to hot crack formation than René 125; it can therefore be used in foundry manufacturing processes of complex shapes.
  • Phosphorus and sulfur deserve the same comments, but their importance is less since their content is already reduced in René 125.
  • Titanium and hafnium their effect was the same but less important, so that their total suppression is not recommended, a slight drop in the content sufficient to greatly reduce the probability of cracks.
  • the levels proposed in the invention lead to probabilities of cracks at least four times lower than in Rene 125 (the comparative tests each time focused on a single variant element).
  • Total content of hafnium, titanium and aluminum the scrap rate was at a low level between approximately 8.73% and 8.77% (cumulative levels), then increased abruptly by being at least four times higher.
  • Aluminum does not per se have the detrimental role of the other elements mentioned above and its content is even increased in the invention, but this criterion shows that it can not be excessively.
  • the total content is advantageously less than the last digit.
  • Nickel The percentage of part waste due to crack decreased from 59.71% nickel, and reached a plateau corresponding to very low scrap rates from around 59.83%. The content is advantageously greater than the latter figure.
  • Silicon it is at most 0.10% by weight in René 125, and advantageously present in the form of traces in the invention.
  • the heat treatment used for the tests as well as for the molding of the blowers was a T3R, ie heating at 1175 ° C for 30 minutes, then cooling to 1095 ° C in 6 to 10 minutes, then cooling baked at 650 ° Celsius, then air-cooled, and annealed at 815 ° C for 16 hours under vacuum or protective atmosphere.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Mold Materials And Core Materials (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Ceramic Products (AREA)
  • Continuous Casting (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention relates to a nickel alloy derived from René 125, but with reduced levels of certain elements (Zr, B, P, S, Si and, to a lesser extent, Ti and Hf) in order to limit the appearance of cracks upon solidification in a moulding process. Specifically, 4.80 % <= Al <= 5.00 %, 1.48 % <= Hf <= 1.52 %, 2.28 % <= Ti <= 2.33 %, 0.005 % <= B <= 0.01 %, 1.77 % <= Mo <= 1.97 %, and Zr <= 0.007 %. Other elements can have levels that match those of René 125.

Description

ALLIAGE A BASE DE NICKEL  NICKEL ALLOY

Le sujet de l'invention est un alliage à base de nickel. The subject of the invention is a nickel-based alloy.

II a été conçu pour améliorer la fabrication en fonderie de certaines pièces de forme complexe comme des aubages distributeurs utilisés dans les stators de moteurs en aéronautique. Ces pièces sont constituées de pales encastrées dans des plate-formes, dont l'assemblage sur moteur constitue un anneau. Certaines de ces pièces sont traditionnellement construites en un alliage à base de nickel appelé René 125, mais qui est particulièrement susceptible de produire des criques au moulage, lors de la solidification du métal liquide, ce qui peut constituer une cause de rebut importante.  It has been designed to improve the foundry fabrication of some complex shaped parts such as distributor blades used in aerospace engine stators. These parts consist of blades embedded in platforms, the engine assembly is a ring. Some of these parts are traditionally constructed of a nickel-based alloy called René 125, but which is particularly likely to produce mold cracks, during the solidification of the liquid metal, which can be a significant cause of rejection.

On a donc recherché un alliage de composition analogue à celle du René 125 afin de conserver pour l'essentiel les propriétés favorables de cet alliage, mais qui serait beaucoup moins propice à la formation de criques.  An alloy with a composition similar to that of René 125 has therefore been sought in order to preserve essentially the favorable properties of this alloy, but which would be much less conducive to the formation of cracks.

Selon l'invention, l'alliage proposé ici comprend, dans une base de nickel, de 9,5% à 9,90 % en poids de Cobalt, de 8,70% à 9,00% en poids de chrome, de 6,65% à 7,05% en poids de tungstène, de 3,67% à 3,87% en poids de tantale, de 1,77 % à 1,97% en poids de Molybdène, de 0,10% à 0,12% en poids de carbone ; et il se distingue de la composition classique du René 125 par des teneurs de 4,80 % à 5,00% en poids d'aluminium, de 1,48% à 1,52% en poids de hafnium, de 2,28% à 2,33% en poids de titane, de 0, 0005% à 0,01% en poids de bore. L'alliage ne comprend en principe pas d'autres ingrédients, sauf à des teneurs beaucoup plus faibles que celles qu'on a mentionnées jusqu'ici, ou seulement à l'état de traces ou d'impuretés. On souligne ainsi en particulier que le zirconium, assez abondant dans le René 125, est supprimé entièrement ou presque du présent alliage (au plus 0, 007% en poids), de même que le phosphore et le soufre (au plus 0,001% en poids chacun) . Certains autres critères, correspondant à des aspects secondaires de l'invention, peuvent encore avantageusement être respectés comme on le détaillera plus loin. According to the invention, the alloy proposed herein comprises, in a nickel base, from 9.5% to 9.90% by weight of cobalt, from 8.70% to 9.00% by weight of chromium, from , 65% to 7.05% by weight of tungsten, from 3.67% to 3.87% by weight of tantalum, from 1.77% to 1.97% by weight of molybdenum, from 0.10% to 0% by weight. 12% by weight of carbon; and it differs from the conventional composition of René 125 by contents of 4.80% to 5.00% by weight of aluminum, from 1.48% to 1.52% by weight of hafnium, 2.28% to 2.33% by weight of titanium, from 0.0005% to 0.01% by weight of boron. The alloy does not in principle include other ingredients, except at levels much lower than those mentioned so far, or only in the form of traces or impurities. It is thus emphasized in particular that zirconium, which is quite abundant in René 125, is completely or almost completely removed from the present alloy (at most 0.007% by weight), as is phosphorus and sulfur (at most 0.001% by weight). each) . Certain other criteria corresponding to secondary aspects of the invention can still be advantageously respected as will be detailed below.

Cet alliage résiste beaucoup mieux à la formation à chaud de criques que le René 125 ; il peut donc être employé dans des procédés de fabrication en fonderie de pièces de formes complexes.  This alloy is much more resistant to hot crack formation than René 125; it can therefore be used in foundry manufacturing processes of complex shapes.

Le tableau ci-après indique les compositions respectives de l'alliage René 125 (en valeurs nominales) et de l'alliage conforme à l'invention, en valeurs minimales et valeurs maximales. Seuls les éléments significatifs ont été rapportés, d'autres étant en général présents à l'état de traces ou d'impuretés. The following table shows the respective compositions of Rene alloy 125 (in nominal values) and of the alloy according to the invention, in minimum values and maximum values. Only the significant elements have been reported, while others are generally present as traces or impurities.

TABLE (% en poids) TABLE (% by weight)

Voici maintenant quelques indications sur les effets obtenus. Il est apparu au cours d'essais que le bore, le zirconium, le silicium, le soufre, le phosphore, le hafnium et le titane étaient favorables à l'apparition des criques à chaud, et c'est pourquoi les teneurs en ces éléments sont réduites par rapport à la composition de l'alliage de départ René 125. D'un point de vue quantitatif, le titane et le hafnium ont vu leur teneur le plus réduite, et le zirconium, le phosphore et le soufre deviennent des éléments présents seulement à l'état de trace, alors que le zirconium était forcément présent et à une teneur non négligeable dans l'alliage de départ. La teneur de certains autres éléments, qu'on n'incrimine pas comme favorisant l'apparition des criques, a aussi été réduite significativement afin d'accroître la teneur en la base de nickel, puisqu'il a été constaté que les criques étaient moins nombreuses avec une teneur en nickel élevée . Here are some indications on the effects obtained. It appeared during tests that boron, zirconium, silicon, sulfur, phosphorus, hafnium and titanium were favorable to the appearance of hot cracks, and this is why the contents of these elements are reduced relative to the composition of the starting alloy Rene 125. From a quantitative point of view, titanium and hafnium have their lowest content, and zirconium, phosphorus and sulfur become present elements only in the trace state, while the zirconium was necessarily present and a significant content in the starting alloy. The content of some of the other elements, which are not credited with favoring the appearance of cracks, was also significantly reduced in order to increase the nickel base content, since the cracks were found to be less many with a high nickel content.

On peut ainsi expliquer l'effet favorable de la réduction ou de la quasi-suppression de ces éléments : les particules qu'ils forment s'accumulent aux joints de grains de l'alliage au cours de la solidification. Les contraintes internes qui se développent à la solidification tendent à produire des fissurations aux joints de grains, et d'autant plus facilement que ces derniers sont encore liquides. La réduction de teneur de ces éléments favorise la solidification des joints de grains à des températures plus proche de celle des grains et accroît donc la cohésion de l'alliage.  One can thus explain the favorable effect of the reduction or the quasi-suppression of these elements: the particles which they form accumulate at the grain boundaries of the alloy during the solidification. The internal stresses that develop in the solidification tend to produce cracks at the grain boundaries, and all the more easily as they are still liquid. The reduction in the content of these elements promotes the solidification of the grain boundaries at temperatures closer to that of the grains and thus increases the cohesion of the alloy.

Voici maintenant des indications plus détaillées sur les différents éléments.  Here are some more detailed indications on the different elements.

Bore et zirconium : il est apparu que ces éléments étaient ceux qui contrariaient le plus la solidification aux joints de grains, et étaient donc responsables d'une solidification à une température bien inférieure à celle des grains eux-mêmes dans le René 125. Leur teneur est donc fortement réduite voire supprimée dans l'alliage de l'invention. En ce qui concerne le bore, des probabilités de criques beaucoup plus faibles (quatre fois plus faible ou encore moins) que dans le René 125 ont toutefois été observées aux teneurs proposées dans l'invention, si bien que la suppression totale de cet élément n'est pas préconisée. Boron and zirconium: it appeared that these elements were the ones that most interfered with the solidification at the grain boundaries, and were therefore responsible for solidification at a much lower temperature than the grains themselves in the René 125. Their content is therefore greatly reduced or suppressed in the alloy of the invention. As far as boron is concerned, much smaller crack probabilities (four times lower or even less) than in René 125 have nevertheless been observed at the contents proposed in the invention, so that the total elimination of this element is not recommended.

Le phosphore et le soufre méritent les mêmes commentaires, mais leur importance est moindre puisque leur teneur est déjà réduite dans le René 125.  Phosphorus and sulfur deserve the same comments, but their importance is less since their content is already reduced in René 125.

Titane et hafnium : leur effet était le même mais moins important, de sorte que leur suppression totale n'est pas préconisée, une légère baisse de la teneur suffisant à diminuer énormément les probabilités de criques. De même que pour le bore, les teneurs proposées dans l'invention entraînent des probabilités de criques au moins quatre fois inférieures que dans le René 125 (les essais comparatifs portaient à chaque fois sur un seul élément variant) . Titanium and hafnium: their effect was the same but less important, so that their total suppression is not recommended, a slight drop in the content sufficient to greatly reduce the probability of cracks. As for boron, the levels proposed in the invention lead to probabilities of cracks at least four times lower than in Rene 125 (the comparative tests each time focused on a single variant element).

Teneur totale en hafnium, titane et aluminium : le taux de rebut avait un palier bas entre 8,73% et 8,77% environ (cumul des teneurs), puis augmentait brusquement ensuite en étant multiplié par quatre au moins environ. L'aluminium n'a pas en soi le rôle néfaste des autres éléments mentionnés ci-dessus et sa teneur est même accrue dans l'invention, mais ce critère montre qu'elle ne peut l'être à l'excès. La teneur totale est avantageusement inférieure au dernier chiffre. Nickel : le pourcentage de rebut des pièces pour cause de criques diminuait à partir d'une teneur de 59,71% en nickel, et atteignait un palier correspondant à des taux de rebut très bas à partir de 59,83% environ. La teneur est avantageusement supérieure à ce dernier chiffre. Total content of hafnium, titanium and aluminum: the scrap rate was at a low level between approximately 8.73% and 8.77% (cumulative levels), then increased abruptly by being at least four times higher. Aluminum does not per se have the detrimental role of the other elements mentioned above and its content is even increased in the invention, but this criterion shows that it can not be excessively. The total content is advantageously less than the last digit. Nickel: The percentage of part waste due to crack decreased from 59.71% nickel, and reached a plateau corresponding to very low scrap rates from around 59.83%. The content is advantageously greater than the latter figure.

Silicium : il est à au plus 0,10% en poids dans le René 125, et avantageusement présent à l'état de traces dans l'invention.  Silicon: it is at most 0.10% by weight in René 125, and advantageously present in the form of traces in the invention.

Le traitement thermique utilisé pour les essais comme pour la fabrication par moulage des distributeurs aubagés était un T3R, à savoir un chauffage à 1175° Celsius pendant 30 minutes, puis un refroidissement jusqu'à 1095° Celsius en 6 à 10 minutes, puis un refroidissement au four jusqu'à 650° Celsius, puis un refroidissement à l'air, et un recuit à 815° Celsius pendant 16 heures sous vide ou atmosphère protectrice.  The heat treatment used for the tests as well as for the molding of the blowers was a T3R, ie heating at 1175 ° C for 30 minutes, then cooling to 1095 ° C in 6 to 10 minutes, then cooling baked at 650 ° Celsius, then air-cooled, and annealed at 815 ° C for 16 hours under vacuum or protective atmosphere.

Claims

REVENDICATIONS 1) Alliage à base de nickel, comprenant de 9,50% à 9,90% en poids de cobalt, de 8,70% à 9,00% en poids de chrome, de 6,65% à 7,05% en poids de tungstène, de 3,67% à 3,87% en poids de tantale, de 0,10% à 0,12% en poids de carbone, de 1,77% à 1,97% en poids de molybdène, caractérisé en ce qu'il comprend de 4,80% à 5,00% en poids d'aluminium, de 1,48% à 1,52% en poids de hafnium, de 2,28% à 2,33% en poids de titane, de 0,005% à 0,01% en poids de bore, et moins de 0,007% en poids de zirconium, le reste étant de nickel et éventuellement d'autres éléments à l'état de traces ou d' impuretés .  1) Nickel-based alloy, comprising from 9.50% to 9.90% by weight of cobalt, from 8.70% to 9.00% by weight of chromium, from 6.65% to 7.05% by weight weight of tungsten, from 3.67% to 3.87% by weight of tantalum, from 0.10% to 0.12% by weight of carbon, from 1.77% to 1.97% by weight of molybdenum, characterized in that it comprises from 4.80% to 5.00% by weight of aluminum, from 1.48% to 1.52% by weight of hafnium, from 2.28% to 2.33% by weight of titanium, from 0.005% to 0.01% by weight of boron, and less than 0.007% by weight of zirconium, the balance being nickel and possibly other elements in the form of traces or impurities. 2) Alliage à base de nickel suivant la revendication 1, caractérisé en ce qu'il comprend encore moins de 0,001% en poids de phosphore et moins de 0,001% en poids de soufre.  2) Nickel-based alloy according to claim 1, characterized in that it comprises still less than 0.001% by weight of phosphorus and less than 0.001% by weight of sulfur. 3) Alliage à base de nickel suivant l'une quelconque des revendications 1 ou 2 caractérisé en ce qu'il comprend plus de 59,83% en poids de nickel.  3) nickel-based alloy according to any one of claims 1 or 2 characterized in that it comprises more than 59.83% by weight of nickel. 4) Alliage à base de nickel suivant l'une quelconque des revendications 1 à 3 caractérisé en ce qu'il comprend moins de 8,77% en poids total de titane, hafnium et aluminium.  4) Nickel-based alloy according to any one of claims 1 to 3 characterized in that it comprises less than 8.77% by total weight of titanium, hafnium and aluminum. 5) Alliage à base de nickel suivant l'une quelconque des revendications précédentes, caractérisé en ce qu' il est utilisé pour fabriquer en fonderie une pièce de distributeur aubagé d'un stator de moteur d' aéronautique . 6) Alliage à base de nickel la revendication 5, caractérisé en ce qu' il est utilisé avec un traitement thermique T3R. 5) Nickel-based alloy according to any one of the preceding claims, characterized in that it is used to manufacture in the casting a bladed distributor part of an aircraft engine stator. 6) Nickel-based alloy according to claim 5, characterized in that it is used with a heat treatment T3R.
EP12775775.5A 2011-09-28 2012-09-27 Nickel alloy Active EP2761044B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1158705A FR2980485B1 (en) 2011-09-28 2011-09-28 NICKEL ALLOY
PCT/FR2012/052187 WO2013045847A2 (en) 2011-09-28 2012-09-27 Nickel alloy

Publications (2)

Publication Number Publication Date
EP2761044A2 true EP2761044A2 (en) 2014-08-06
EP2761044B1 EP2761044B1 (en) 2015-08-19

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US (1) US20140241936A1 (en)
EP (1) EP2761044B1 (en)
JP (1) JP2014530299A (en)
CN (1) CN103827331B (en)
BR (1) BR112014007419A2 (en)
CA (1) CA2850238A1 (en)
FR (1) FR2980485B1 (en)
RU (1) RU2014116986A (en)
WO (1) WO2013045847A2 (en)

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US20200102628A1 (en) 2017-03-31 2020-04-02 Siemens Aktiengesellschaft High-temperature nickel-based alloys
CN113265564B (en) * 2021-05-06 2022-04-29 中国联合重型燃气轮机技术有限公司 A kind of superalloy with good long-term stability and preparation method thereof

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Also Published As

Publication number Publication date
WO2013045847A2 (en) 2013-04-04
WO2013045847A3 (en) 2013-10-24
CN103827331A (en) 2014-05-28
EP2761044B1 (en) 2015-08-19
BR112014007419A2 (en) 2017-04-04
FR2980485A1 (en) 2013-03-29
CN103827331B (en) 2016-05-11
JP2014530299A (en) 2014-11-17
CA2850238A1 (en) 2013-04-04
US20140241936A1 (en) 2014-08-28
FR2980485B1 (en) 2014-07-04
RU2014116986A (en) 2015-11-10

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