Method for reducing inner residual stress of nickel-based superalloy

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...

Examples

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...

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...

Examples

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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