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A Method for Reducing Internal Residual Stress in Nickel-Based Superalloys

A nickel-based superalloy and internal residual stress technology, which is applied to nickel-based superalloys to reduce the internal residual stress of nickel-based superalloys, can solve the problems of reduced material performance, no relevant reports, potential safety hazards, etc., and achieve dimensional stability of materials Sex-enhancing effect

Inactive Publication Date: 2015-12-30
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Nickel-based superalloy is a superalloy with nickel as the matrix (generally greater than 50%) and has high strength and good oxidation resistance and gas corrosion resistance in the range of 650-1000 °C; in the 1950s, the development of vacuum After the smelting and precision casting process, a series of casting alloys with good high temperature strength were developed; in the mid-1960s, directional crystallization and single crystal superalloys and powder metallurgy superalloys with better performance were developed; they are mainly used for aircraft engines and other important Structural materials of parts; as far as the current preparation process is concerned, nickel-based alloys are mainly formed by casting, and there are more residual stresses in the as-cast alloy due to shrinkage imbalance during casting; in modern industry, nickel-based alloys are mainly used in In key parts such as aircraft engine components, the residual stress remaining in the components that has not been eliminated will be released during the service process of the components, causing stress corrosion, reducing the performance of the material, and easily causing safety hazards; therefore, a nickel-based alloy is provided residual stress method is very necessary
[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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  • A Method for Reducing Internal Residual Stress in Nickel-Based Superalloys
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  • A Method for Reducing Internal Residual Stress in Nickel-Based Superalloys

Examples

Experimental program
Comparison scheme
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 table 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: Udmet500 Cold and hot cycle treatment scheme and dimensional stability improvement effect of nickel-based superalloy

[0039] Table 3 The 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 war...

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Abstract

The present invention involves nickel -based high -temperature alloys, which refers to a method that reduces the internal residual stress of the nickel -based high -temperature alloy.That is, based on the type of nickel -based alloy, design the corresponding hot and cold circulation processing process, mainly to regulate the main parameters of the cooling speed, low temperature treatment temperature, thermal insulation time, temperature recovery temperature and processing time, and the number of cycles during cold treatment.The purpose of residual stress within the consequences, at this time, the size of the casting size can be increased by 40-45%, which is of great significance for improving the safety of nickel-based alloy.

Description

technical field [0001] The invention relates to a nickel-based high-temperature alloy, in particular to a method for reducing the internal residual stress of the nickel-based high-temperature alloy and improving its dimensional stability, and belongs to the field of material preparation. Background technique [0002] Nickel-based superalloy is a superalloy with nickel as the matrix (generally greater than 50%) and has high strength and good oxidation resistance and gas corrosion resistance in the range of 650-1000 °C; in the 1950s, the development of vacuum After the smelting and precision casting process, a series of casting alloys with good high temperature strength were developed; in the mid-1960s, directional crystallization and single crystal superalloys and powder metallurgy superalloys with better performance were developed; they are mainly used for aircraft engines and other important Structural materials of parts; as far as the current preparation process is concern...

Claims

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Application Information

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