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Heat treatment technology for improving high-temperature tensile ductility of Ni-Fe-Cr based deformation high-temperature alloy

A technology for deforming superalloys and tensile plasticity, applied in the field of heat treatment, can solve the problems of low tensile plasticity, high alloy yield and fracture strength, and achieve the effect of improving tensile plasticity and grain boundary strength

Active Publication Date: 2017-06-13
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The intergranular grain boundary shape obtained by this kind of heat treatment process is mostly straight, and the yield and fracture strength of the alloy are high, but the tensile plasticity is low

Method used

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  • Heat treatment technology for improving high-temperature tensile ductility of Ni-Fe-Cr based deformation high-temperature alloy
  • Heat treatment technology for improving high-temperature tensile ductility of Ni-Fe-Cr based deformation high-temperature alloy

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Effect test

Embodiment 1

[0026] see figure 1 , taking a nickel-iron-chromium-based superalloy within the composition range in the summary of the invention, the precipitation temperature of the γ' phase is 971°C. The deformed nickel-iron-chromium-based superalloy sample was subjected to high-temperature solution treatment, the solution temperature was 1150°C, and the holding time was 1 hour; then it was slowly cooled to 900°C at a rate of 4°C / min, held for 2 hours, and then air-cooled to Room temperature; low temperature aging treatment at 650°C, heat preservation for 16 hours and air cooling to room temperature; then medium temperature aging at 780°C, heat preservation for 8 hours and air cooling to room temperature. The tensile plasticity of the alloy at 750 °C is shown in Table 1.

Embodiment 2

[0028] Taking a nickel-iron-chromium-based superalloy within the composition range in the summary of the invention, the precipitation temperature of the γ' phase is 971°C. The deformed nickel-iron-chromium-based superalloy sample was subjected to high-temperature solution treatment, the solution temperature was 1150°C, and the holding time was 1 hour; then it was slowly cooled to 900°C at a rate of 4°C / min, held for 2 hours, and then air-cooled to Room temperature; followed by aging, the aging temperature is 780°C, the holding time is 8 hours, and then air-cooled to room temperature. The tensile plasticity of the alloy at 750 °C is shown in Table 1.

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Abstract

The invention discloses a heat treatment technology for improving high-temperature tensile ductility of Ni-Fe-Cr based deformation high-temperature alloy. The technology includes the steps that heat preservation lasts for 0.5-2h within the temperature range of 1050-1200 DEG C for performing solution treatment; the temperature is lowered to 20-150 DEG C below a gamma' phase precipitation temperature from the solution temperature at the speed of 0.1-20 DEG C / min, and air cooling is conducted to an indoor temperature after heat preservation lasts for 0.5-4h; and heat preservation is performed for 4-30h at the temperature 150-350 DEG C below the gamma' phase precipitation temperature, and air cooling is conducted again to the indoor temperature. According to the heat treatment technology, the method with high-temperature solution, slow cooling and low-temperature aging combined is adopted, the grain size of an obtained alloy structure is moderate, a bent sawtooth crystal boundary is formed among grains, and M23C6-type carbide is evenly distributed on the crystal boundary; and the crystal boundary has a good reinforcement effect under the high-temperature condition, and the high-temperature tensile ductility of the alloy is high.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a heat treatment process for improving the high-temperature tensile plasticity of a nickel-iron-chromium-based deformed superalloy. Background technique [0002] In order to meet the demand for electricity from the rapid development of the national economy and to meet the severe requirements of environmental protection, the development of new power station technologies with high efficiency, energy saving, large capacity, clean environmental protection, and high reliability is an important challenge for thermal power generation. Steam parameters are one of the main ways to achieve this goal. At present, the boiler steam parameters are developing towards 650°C, 700°C / 35MPa and above. To realize the reliable operation of the high steam parameter unit, the key pipelines of the boiler, such as the final superheater, the final reheater, the main steam pipeline, the header, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22C30/00C22C30/02C22C19/05
CPCC22C19/055C22C19/056C22C19/058C22C30/00C22C30/02C22F1/10
Inventor 赵新宝党莹樱袁勇尹宏飞鲁金涛杨珍杨征谷月峰
Owner HUANENG POWER INT INC
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