Method for reducing inner residual stress of nickel-based superalloy

A technology of nickel-based superalloys and internal residual stress, which is applied in the field of nickel-based superalloys to reduce the internal residual stress of nickel-based superalloys, can solve the problems of reducing material performance, safety hazards, stress corrosion, etc., and achieve material dimensional stability Improved effect

Inactive Publication Date: 2014-03-26
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Nickel-based superalloys are based on nickel (the content is generally greater than 50%) and have high strength and good oxidation resistance and anti-oxidation in the range of 650-1000 °C High-temperature alloys with gas corrosion ability; in the 1950s, after the development of vacuum melting and precision casting processes, a series of casting alloys with good high-temperature strength were developed; in the mid-1960s, directional crystals and single crystals with better performance were developed. Superalloys and powder metallurgy superalloys; mainly used as structural materials for important parts such as aircraft engines; as far as the current preparation process is concerned, nickel-based alloys are mainly formed by casting, and there are relatively large amounts of alloys in the as-cast alloy due to shrinkage imbalance during casting. Multiple residual stresses; in modern industry, nickel-based alloys are mainly used in key parts such as aircraft engine components, and the residual stress remaining in the components that has not been eliminated will be released during the service of the components, causing stress corrosion and reducing the performance of the material , it is also easy to cause safety hazards; so it is very necessary to provide a method for eliminating the residual stress of nickel-based alloys
[0003]Current research reports on eliminating residual stress in nickel-based alloy castings are mainly as follows: For the residual stress generated by welding, it can be realized by overall high-temperature tempering after welding; Hole method and X-ray diffraction and other methods to measure the internal residual stress of the alloy; however, there is no relevant report on how to effectively eliminate the residual stress caused by the internal casting or pressure processing of the alloy

Method used

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  • Method for reducing inner residual stress of nickel-based superalloy

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1: Cold and hot cycle treatment scheme and dimensional stability improvement effect of CMSX4 nickel-based superalloy

[0017] Table 1 Composition list of high temperature nickel-based alloy CMSX4

[0018]

[0019] In vacuum smelting, the CMSX4 nickel-based alloy was smelted according to the above composition ratio, and it was formed by investment casting; the alloy was subjected to solution treatment at 1312°C for 6 hours, and then air-cooled to room temperature after heat treatment.

[0020] The cold and hot cycle treatment process is:

[0021] The cooling rate during cold treatment is 5°C / min;

[0022] Low temperature treatment temperature is -150°C;

[0023] Holding time 24h;

[0024] Set the temperature at 200°C for 22 hours during the warm-up treatment;

[0025] The number of heating and cooling cycles is 2;

[0026] After the above cold and heat cycle treatment, the dimensional stability of CMSX4 increased by 40%.

Embodiment 2

[0027] Example 2: Cold and hot cycle treatment scheme and dimensional stability improvement effect of CMSX10N nickel-based superalloy

[0028] Table 2 Composition list of nickel-based superalloy CMSX10N

[0029]

[0030] In vacuum melting, the CMSX10N nickel-based alloy was smelted according to the above composition ratio, and it was formed by investment casting; the alloy was subjected to solid solution treatment at 1360°C for 24 hours, and air-cooled to room temperature after heat treatment.

[0031] The cold and hot cycle treatment process is:

[0032] The cooling rate during cold treatment is 15°C / min;

[0033] Low temperature treatment temperature is -175°C;

[0034] Holding time 36h;

[0035] Set the temperature at 250°C for 18 hours during the warm-up treatment;

[0036] The number of heating and cooling cycles is 2;

[0037] After the above cold and heat cycle treatment, the dimensional stability of CMSX4 increased by 45%.

Embodiment 3

[0038] Embodiment three: Udmet 500 Cold and hot cycle treatment scheme and dimensional stability improvement effect of nickel-based superalloy

[0039] Table 3 Composition list of Udmet500 nickel-based superalloy

[0040]

[0041] In vacuum melting, Udmet500 nickel-based alloy is smelted according to the above composition ratio, and it is formed by investment casting; the alloy is subjected to four-stage solution aging treatment, specifically: solution treatment, 1175 ° C, 2 hours, air cooling; intermediate treatment , 1080°C, 4 hours, air-cooled; primary aging treatment, 843°C, 24 hours, air-cooled; secondary aging treatment, 760°C, 16 hours, air-cooled.

[0042] Air-cool to room temperature after heat treatment; cold and heat cycle treatment process is:

[0043] The cooling rate during cold treatment is 20°C / min;

[0044] Low temperature treatment temperature is -196°C;

[0045] Holding time 48h;

[0046] Set the temperature at 755°C for 24 hours during the warm-u...

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Abstract

The invention relates to nickel-based superalloy, and particularly relates to a method for reducing the inner residual stress of the nickel-based superalloy. The method is characterized in that a corresponding thermal-cold cycling treatment technology is designed based on the variety of nickel-based alloy; by adjusting main parameters such as cooling rate during cold treatment, low-temperature treatment temperature, heat preserving time, tempering temperature, treatment time, cycle numbers and the like, the purpose of reducing the inner residual stress of the nickel-based superalloy is realized, and the dimensional stability of castings can be improved by 40-45%. The method has important significance for improving the service safety of the nickel-based superalloy.

Description

Technical field [0001] The present invention involves nickel -based high -temperature alloys. It refers to a method that reduces the internal residual stress of the nickel -based high -temperature alloy to improve its size stability and belongs to the field of material preparation. Background technique [0002] Nickel -based high -temperature alloys are high -temperature alloys that have high strength and good antioxidant and resistance to fuel corrosion in the range of 650 to 1000 ° C with nickel -based alloy (content is generally greater than 50%).After the melting and precision casting process, a series of cast alloys with good high temperature intensity have been developed; in the mid -1960s, they developed better directional crystals and single crystal high -temperature alloys and powder metallurgy high -temperature alloys; mainly used as an important aircraft engine and other important important aircraft engines.The structural material of the component; in terms of the curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C21D11/00
CPCY02P10/20
Inventor 李桂荣王宏明
Owner JIANGSU UNIV
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