Post-weld heat treatment method for high-temperature alloy

A post-weld heat treatment and high-temperature alloy technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as overaging, aging cracks, and inability to effectively eliminate welding residual stress, and achieve the effect of restoring mechanical properties

Inactive Publication Date: 2021-06-11
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is likely to cause overaging of the base metal adjacent to the HAZ, and because the welding residual stress cannot be effectively eliminated at the aging treatment temperature, it is easy to cause strain aging cracks in the HAZ

Method used

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  • Post-weld heat treatment method for high-temperature alloy
  • Post-weld heat treatment method for high-temperature alloy

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Experimental program
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Effect test

Embodiment 1

[0022] See Table 1 and figure 1 According to thermodynamic calculations, the recrystallization temperature of Inconel740H is 995°C, and the γ' phase precipitation temperature is 976°C. Post-weld heat treatment for Inconel740H welded joints: 1025°C / 1h low temperature solid solution + 800°C / 5h / air cooling aging treatment , no defects such as welding cracks, HAZ hardness is 290HV, base metal hardness is 295HV.

Embodiment 2

[0024] See Table 1 and figure 2 According to thermodynamic calculations, the recrystallization temperature of Haynes282 alloy is 988°C, and the γ' phase precipitation temperature is 989°C. Post-weld heat treatment for Haynes282 welded joints: 1010°C / 2h low temperature solid solution + 788°C / 8h / air cooling aging After treatment, no defects such as welding cracks occur, the hardness of the HAZ is 290HV, and the hardness of the base metal is 310HV.

[0025] Table 1 embodiment welding wire and base metal measured chemical composition (mass fraction %)

[0026] chemical composition C Fe Cr co Al Ti mn Mo Nb Si B Ni Inconel 740H 0.03 1.0 25.0 20.0 1.4 1.4 0.3 0.5 1.5 0.2 0.001 Remain Haynes 282 0.04 1.0 19.5 10.0 1.5 2.1 0.3 8.5 - 0.1 0.003 Remain

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Abstract

The invention discloses a post-weld heat treatment method for a high-temperature alloy, belongs to the field of material heat treatment, and particularly relates to a post-weld heat treatment method for a precipitation strengthening type high-temperature alloy for a high-temperature component of an advanced ultra-supercritical (A-USC) power station. The post-weld heat treatment method comprises the following steps of 1) low-temperature solid solution, specifically, keeping the temperature of 20-40 DEG C above the gamma' phase precipitation temperature or the recrystallization temperature (the higher temperature is selected) for 1-2 hours, and then performing air cooling to the aging temperature; and 2) aging, specifically, keeping the temperature for 4-16 hours in a gamma' phase precipitation temperature range, and then air-cooling to room temperature. According to the high-temperature alloy welding joint obtained through the post-weld heat treatment method, the welding residual stress is eliminated to the maximum extent, gamma' strengthening phases are evenly distributed in crystals, strain aging cracks of a welding heat affected zone are effectively avoided, and the mechanical property of the heat affected zone is recovered to the base metal level.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment, and relates to a precipitation-strengthening post-weld heat treatment method for superalloys. Background technique [0002] With the development of 700°C ultra-supercritical coal-fired power generation technology, the steam parameters of power stations have increased from 600°C ultra-supercritical and subcritical to 700°C, requiring high-temperature alloy materials (such as Haynes 282 and Inconel740H) for key high-temperature components. Since welded joints have always been the weak link of key high-temperature components in power stations, the quality and performance of welded joints are related to the safe operation of the unit. [0003] Precipitation-strengthened superalloy welded joints are affected by welding heat cycles, and the temperature of the welding heat-affected zone (HAZ) exceeds the precipitation temperature of the γ′ phase, resulting in the remelting of the γ′ phas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C21D9/50
CPCC22F1/10C21D9/50
Inventor 尹宏飞袁勇鲁金涛党莹樱杨珍谷月峰严靖博
Owner XIAN THERMAL POWER RES INST CO LTD
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