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Heat treatment process for improving high-temperature tensile plasticity of heat-resistant alloy

A heat-resistant alloy and tensile plasticity technology is applied in the field of heat treatment process for improving high-temperature tensile plasticity of heat-resistant alloys, which can solve the problems of reduced high-temperature yield strength and low strength, achieve good tensile plasticity, improve strength, and prevent cracking. Effect

Active Publication Date: 2022-01-18
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, austenite is more ductile than martensite, but not as strong
Therefore, improving the high-temperature tensile plasticity of heat-resistant alloys by increasing the austenite content often leads to a decrease in the high-temperature yield strength

Method used

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  • Heat treatment process for improving high-temperature tensile plasticity of heat-resistant alloy
  • Heat treatment process for improving high-temperature tensile plasticity of heat-resistant alloy
  • Heat treatment process for improving high-temperature tensile plasticity of heat-resistant alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Take the deformed heat-resistant alloy whose composition is heat-resistant alloy 1 in Table 1, the precipitation temperature of the second phase at the grain boundary of the heat-resistant alloy and the complete austenitization A c3 The temperatures were measured by experimental instruments and were 1102°C and 700.6°C, respectively. Now heat the heat-resistant alloy to 1000°C at a heating rate of 15°C per min, keep it warm for 30 minutes, and complete the solution treatment, and then water-cool to room temperature. Sample, the microstructure of the sample after solid solution treatment is as follows figure 1 shown. From figure 1 It can be seen that after the treatment in step 1, massive discontinuous precipitates precipitate at the austenite and martensite grain boundaries of the heat-resistant alloy, and their average size does not exceed 4 μm.

[0038] Step 2: Heat the sample after solid solution treatment to 750°C at a rate of 10°C per min, keep it warm fo...

Embodiment 2

[0040] Step 1: Take the deformed heat-resistant alloy whose composition is heat-resistant alloy 2 in Table 1, the precipitation temperature of the second phase at the grain boundary of the heat-resistant alloy and the complete austenitization A c3 The temperatures were measured by experimental instruments and were 1108°C and 706.4°C, respectively. Now heat the heat-resistant alloy to 990°C at a heating rate of 15°C / min, hold it for 30 minutes, and complete the solution treatment, then water-cool to room temperature, and the temperature of the cooling medium used for water cooling is not higher than 30°C. After the treatment in step 1, blocky phases are discontinuously precipitated at the grain boundary between austenite and martensite, with an average size of no more than 4 μm.

[0041]Step 2: Heat the sample after solid solution treatment to 750°C at a heating rate of 10°C / min, hold it for 12 hours, complete the aging treatment, and then water-cool, the temperature of the coo...

Embodiment 3

[0051] Step 1: The deformed heat-resistant alloy includes the following components by weight percentage, C: 0.05%, Cr: 11.5%, Ni: 1.6%, Mn: 10%, Si: 0.3%, B: 0.007%, Mo: 1.5 %, W: 4%, Cu: 1.2%, Al: 1%, and the balance is Fe.

[0052] It is measured that the precipitation temperature of the second phase at the grain boundary of the alloy is 1106°C, and its complete austenitization A c3 The temperature was 705°C. Now heat the heat-resistant alloy to 998°C at a heating rate of 15°C / min, hold it for 30 minutes, and complete the solution treatment, then water-cool to room temperature, and the temperature of the cooling medium used for water cooling is not higher than 30°C. After solution treatment, massive phases are discontinuously precipitated at the grain boundary between austenite and martensite, and the average size does not exceed 4 μm.

[0053] Step 2: Heat the sample after solid solution treatment to 760°C at a heating rate of 10°C / min, keep it warm for 12 hours, complete...

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Abstract

The invention discloses a heat treatment process for improving high-temperature tensile plasticity of a heat-resistant alloy, which comprises the following steps: 1) heating the heat-resistant alloy in a deformation state to 100-150 DEG C below the second phase dissolution temperature of a grain boundary, carrying out solution treatment for 30-45 min, and then performing cooling; and 2) heating the heat-resistant alloy treated in the step 1) to the temperature higher than a complete austenitizing temperature and lower than 50 DEG C, carrying out aging treatment, and then performing cooling. The structure morphology of the alloy is controlled through simple heat treatment, and the high-temperature ductility is improved by 70% or above under the condition that the tensile yield strength at the high temperature of 650 DEG C is not lost.

Description

technical field [0001] The invention relates to the field of heat treatment of heat-resistant alloys, in particular to a heat treatment process for improving the high-temperature tensile plasticity of heat-resistant alloys. Background technique [0002] Global warming has become one of the major issues in the world today. In order to cope with global warming and improve the human living environment, it is necessary to continuously reduce the emission of greenhouse gases such as carbon dioxide and carbon monoxide. Improving the parameters of thermal power units is one of the effective ways to reduce carbon dioxide and carbon monoxide emissions and improve thermal efficiency. However, increasing the parameters of thermal power units has higher requirements for the selection of key high-temperature components of the boiler. [0003] The key high-temperature components of boilers require not only high-temperature strength, flue gas corrosion resistance, and steam oxidation cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/54C22C38/44C22C38/42C22C38/06C21D1/18C21D6/00
CPCC22C38/58C22C38/02C22C38/54C22C38/44C22C38/42C22C38/06C21D1/18C21D6/004C21D6/005C21D6/008C21D2211/008C21D2211/001
Inventor 张鹏杨征严靖博袁勇谷月峰杨珍周永莉鲁金涛
Owner HUANENG POWER INTERNATIONAL
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