Method for eliminating original grain boundary of nickel-based powder metallurgy superalloy

A nickel-based superalloy and superalloy technology, which is applied in the field of alloy materials, can solve the problems of grain growth, coarse grain structure, unsatisfactory structure conditions, etc., achieve fine and uniform grain size, and eliminate powder particle boundaries. , the effect of preventing excessive growth

Inactive Publication Date: 2018-03-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

figure 1 is the relationship between the grain size of the powder superalloy and the hot isostatic pressing temperature. figure 1 It can be seen that as the hot isostatic pressing temperature increases, the grain size gradually increases. When the temperature is near the subsolidus line, the grain size increases rapidly. Although high temperature can be used to promote the dissolution of carbides and oxides, Reduce the original powder particle boundary (PPB), but at the same time it is easy to cause problems such as coarsening and unevenness of the grain structure, resulting in excessive grain growth and affecting the mechanical properties of the material; the third is to eliminate PPB by hot extrusion deformation and crushing, but Insufficient tissue conditions or improper deformation conditions may cause grain coarsening

Method used

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  • Method for eliminating original grain boundary of nickel-based powder metallurgy superalloy
  • Method for eliminating original grain boundary of nickel-based powder metallurgy superalloy
  • Method for eliminating original grain boundary of nickel-based powder metallurgy superalloy

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preparation example Construction

[0039] The preparation method of the nickel-based powder superalloy described in this application is aimed at all nickel-based powder superalloys. As a preferred solution, the nickel-based powder superalloy includes: 13wt% to 30wt% of Co, 8wt% to 18wt% of Cr, 1wt% to 8wt% of Mo, 1wt% to 8wt% of W, 1wt% to 5wt% of Al, 1wt% to 5wt% of Ti and traces of C, B, Zr and Hf, and the balance is Ni; further, The nickel-based powder superalloy includes: 25wt% to 30wt% of Co, 10wt% to 15wt% of Cr, 3wt% to 6wt% of Mo, 3wt% to 6wt% of W, 2wt% to 4wt% of Al, 2wt% % to 4wt% of Ti, the content of C, B, Zr and Hf are independently greater than or equal to 0.02wt%, and the sum is less than or equal to 0.5wt%, and the balance is Ni. Further, in the nickel-based powder superalloy Containing trace elements: 0.05-0.25wt% of Hf, 0.02-0.1wt% of C, 0.02-0.09wt% of B, 0.02-0.8wt% of Zr, and the contents of other components are in the same range as above.

[0040] This application provides a method for e...

Embodiment 1

[0044] The main components of the nickel-based superalloy used in this embodiment are shown in Table 1,

[0045] Table 1 Composition Table of Alloy 1 (wt.%)

[0046]

[0047] The nickel-based superalloy powder is prepared by argon atomization, and the nickel-based superalloy powder is sieved by a vibrating sieve to obtain a powder with a particle size range of -200 mesh. The powder is put into a bag, degassed and sealed. , and then put it into the hot isostatic pressing equipment to start hot isostatic pressing. The complete dissolution temperature of the γ' phase of the nickel-based superalloy in this embodiment is between 1140-1150 ° C. The hot isostatic pressing process system selected for this alloy is 1120℃ / 150MPa / 4h, that is, the hot isostatic pressing temperature is 1120℃, the hot isostatic pressing pressure is 150MPa, and the hot isostatic pressing holding time is 4h.

[0048] The microstructure of the nickel-based superalloy prepared by the above hot isostatic pre...

Embodiment 2

[0055] The main components of the nickel-based superalloy used in this embodiment are shown in Table 2,

[0056] Table 2 Composition Table of Alloy 2 (wt.%)

[0057]

[0058] The nickel-based superalloy powder is prepared by the plasma rotating electrode method, and the superalloy powder is sieved by a vibrating sieve to obtain a uniform particle size range of -100 mesh to +270 mesh powder. Put the powder into the package, degas and seal, and then put it into the hot isostatic pressing equipment to start hot isostatic pressing. The complete dissolution temperature of the γ' phase of the nickel-based superalloy in this embodiment is between 1120-1130 °C During the period, the hot isostatic pressing process system selected for this alloy is 1100 ° C / 150 MPa / 4h, that is, the hot isostatic pressing temperature is 1100 ° C, the hot isostatic pressing pressure is 150 MPa, and the hot isostatic pressing holding time is 4 h.

[0059] The microstructure of the nickel-based supe...

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Abstract

The invention provides a method for eliminating the original grain boundary of a nickel-based powder metallurgy superalloy, belonging to the technical field of superalloys. According to the invention,the method adopts hot isostatic pressing and intense-plastic-deformation hot extrusion at a temperature below the complete dissolution temperature of a gamma' phase, makes full use of the pinning effect of the gamma' phase on the grain boundary in the hot isostatic pressing stage to control the grain size of the superalloy and prevent excessive grain growth, and then carries out optimized designon hot extrusion parameters to further refine grains and to crush and eliminate the original powder grain boundary. The method provided by the invention can eliminate the original grain boundary in the nickel-based powder metallurgy superalloy and prepare workpieces with particularly fine and uniform grain sizes.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a method for obtaining a nickel-based powder superalloy with particularly fine crystal grains while eliminating the original powder particle boundaries in the nickel-based powder superalloy. Background technique [0002] High-temperature alloy materials generally use nickel-based alloys, iron-based alloys and cobalt-based alloys. In order to meet the harsher use environment, it is necessary to continuously improve the degree of alloying of superalloy materials, but the higher the degree of alloying of the material, the more likely the alloy is to suffer from serious segregation, uneven structure, and deterioration of thermal processing performance. Therefore, traditional casting , The superalloy produced by the deformation process can no longer meet the requirements of service performance. [0003] The pre-alloyed powder is prepared by rapid solidification technology, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22C19/05C22C30/00B22F3/15B22F3/20
CPCB22F3/15B22F3/20B22F2003/208B22F2998/10C22C19/056C22C19/057C22C30/00C22F1/10
Inventor 不公告发明人
Owner CENT SOUTH UNIV
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