Haynes 282焊接接头长时热暴露后的力学性能和组织稳定性

doi:10.11896/cldb.24050002

材料导报

2025, Vol. 39

Issue (14): 24050002-7 https://doi.org/10.11896/cldb.24050002

金属与金属基复合材料

Haynes 282焊接接头长时热暴露后的力学性能和组织稳定性

刁旺战^1,2, 徐祥久^1,2,*, 王萍^1,2, 赵卫君^1,2, 刘海^1,2, 张松^1,2

1 低碳热力发电技术与装备全国重点实验室,哈尔滨 150046
2 哈尔滨锅炉厂有限责任公司,哈尔滨 150046

Mechanical Properties and Microstructural Stability of Haynes 282 Weld Joints Experienced Long-term Thermal Exposure

DIAO Wangzhan^1,2, XU Xiangjiu^1,2,*, WANG Ping^1,2, ZHAO Weijun^1,2, LIU Hai^1,2, ZHANG Song^1,2

1 State Key Laboratory of Low-carbon Thermal Power Generation Technology and Equipments, Harbin 150046, China
2 Harbin Boiler Company Limited, Harbin 150046, China

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摘要采用热丝TIG焊工艺对镍基高温合金Haynes 282进行焊接,焊后进行时效强化热处理(1 010 ℃/2 h/空冷+(788±15) ℃/8 h/空冷),热处理后在使用温度(750 ℃)下对焊接接头进行时长分别为1 000 h、3 000 h、5 000 h、8 000 h和10 000 h的长时热暴露实验,并开展热暴露后的微观组织和力学性能演变研究。热暴露5 000 h后,焊缝中开始析出μ相,且μ相数量随热暴露时长的增加(至10 000 h)而逐步增多。焊接接头中母材和焊缝的γ′相粗化速率均符合Lifshitz-Slyozov-Wagner(LSW)熟化理论。热暴露10 000 h后,冲击韧性(试样尺寸55 mm×10 mm×7.5 mm)由时效强化热处理后的33.2 J/cm²下降到15.6 J/cm²。焊接接头力学性能随热暴露时长的增加先升高后降低,此趋势产生的原因一方面跟γ′与位错之间的相互作用由弱耦合位错剪切向强耦合位错剪切转化有关,另一方面与μ相的析出、形态和数量变化有关。

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关键词: Haynes 282 热暴露焊接微观组织演变力学性能

Abstract: The nickel based high-temperature alloy Haynes 282 was welded using the hot-wire TIG welding process, followed by aging strengthening heat treatment (1 010 ℃/2 h/air cooling+(788±15) ℃/8 h/air cooling). After heat treatment, long-term thermal exposure tests with time lengths of 1 000 h, 3 000 h, 5 000 h, 8 000 h, and 10 000 h were conducted on the welded joints at the service temperature of 750 ℃. After 5 000 hour thermal exposure, μ-phase began to precipitate in the weld, and the amount of μ-phase gradually increased with further prolonged thermal exposure (up to 10 000 h). The coarsening rates of γ′-phase in both the base metal and the welded joint conformed to the Lifshitz-Slyozov-Wagner (LSW) ripening theory. After 10 000 hour thermal exposure, the impact toughness (specimen size:55 mm×10 mm×7.5 mm) decreased from 33.2 J/cm² after aging treatment to 15.6 J/cm². The mechanical properties of the welded joint first increased and then decreased with increasing thermal exposure time length. This trend can be attributed to two factors:(ⅰ) the interaction between γ′-phase and dislocations transformed from weakly coupled dislocation shearing to strongly coupled dislocation shearing; (ⅱ) the precipitation, morphology, and quantity changes of the μ-phase.

Key words: Haynes 282 thermal exposure welding evolution of microstructure mechanical property

出版日期: 2025-07-25 发布日期: 2025-07-29

ZTFLH:

TG444+.74

基金资助: 黑龙江省自然科学基金(LH2022E077)

通讯作者: * 徐祥久,硕士,正高级工程师。目前主要从事电站锅炉、压力容器以及新能源产品的焊接和热处理技术工作,以及新材料、新结构高效焊接技术开发,先进焊接设备研制等。xuxj@hbc.com.cn

作者简介: 刁旺战,高级工程师,目前就职于哈尔滨锅炉厂有限责任公司,主要从事电站锅炉、压力容器用耐热钢和高温合金的焊接工艺、焊接接头力学性能和微观组织等的研究。

引用本文:

刁旺战, 徐祥久, 王萍, 赵卫君, 刘海, 张松. Haynes 282焊接接头长时热暴露后的力学性能和组织稳定性[J]. 材料导报, 2025, 39(14): 24050002-7.
DIAO Wangzhan, XU Xiangjiu, WANG Ping, ZHAO Weijun, LIU Hai, ZHANG Song. Mechanical Properties and Microstructural Stability of Haynes 282 Weld Joints Experienced Long-term Thermal Exposure. Materials Reports, 2025, 39(14): 24050002-7.

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https://www.mater-rep.com/CN/10.11896/cldb.24050002 或 https://www.mater-rep.com/CN/Y2025/V39/I14/24050002

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