| 长时高温服役T91/Inconel601异种钢焊接接头失效分析 |
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| 引用本文： | 杜宝帅,王金海,孙国强,徐艳,张忠文,李新梅.长时高温服役T91/Inconel601异种钢焊接接头失效分析[J].金属热处理,2012(6):122-126. |
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| 作者姓名： | 杜宝帅 王金海 孙国强 徐艳 张忠文 李新梅 |
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| 作者单位： | 山东电力研究院;华能德州电厂;大唐黄岛发电有限责任公司 |
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| 基金项目： | 山东电力集团公司科学技术项目(2010A-24) |
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| 摘 要： | 对长时高温服役状态下发生开裂的T91/Inconel601异种钢焊接接头进行了组织结构表征和失效原因分析。结果表明,焊接接头的开裂性质为蠕变损伤造成的脆性开裂。焊接接头较高应力水平是构成开裂的力学因素,而熔合线靠近T91钢一侧碳化物富集带的产生是开裂的冶金因素。碳活度差异驱动的碳元素迁移和镍基焊缝中较低的碳原子扩散速度的综合作用造成熔合线附近T91钢侧碳化物富集析出。
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| 关 键 词： | T91/Inconel601异种钢 焊接接头 失效 蠕变损伤 |
Failure analysis of T91/Inconel601 dissimilar metal welded joint under long-time and high-temperature service |
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| DU Baoshuai,WANG Jinhai,SUN Guoqiang,XU Yan,ZHANG Zhongwen,LI Xinmei.Failure analysis of T91/Inconel601 dissimilar metal welded joint under long-time and high-temperature service[J].Heat Treatment of Metals,2012(6):122-126. |
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| Authors: | DU Baoshuai WANG Jinhai SUN Guoqiang XU Yan ZHANG Zhongwen LI Xinmei |
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| Affiliation: | 1(1.Shandong Electric Power Research Institute,Jinan Shandong 250002,China;2.Huaneng Dezhou Power Plant, Dezhou Shandong 253024,China;3.Datang Huangdao Power Generation Co.,Ltd.,Qingdao Shandong 266500,China) |
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| Abstract: | T91/Inconel601 dissimilar metal weld joint which cracked during long-time and high-temperature service was characterized in terms of microstructure and the reason of failure was also analyzed.The results show that weld joint fails in the mode of brittle cracking caused by creep damage.Relatively high stress level of weld joint is the mechanical factor of cracking,and the presence of carbide-rich zone formed along the fusing line near T91 steel is the metallurgical factor.Due to synergetic effect of carbon diffusion driven by difference of carbon activity and relatively lower carbon atom diffusion speed in the nickel-based weld metal,carbide enriched and precipitated in the zone of T91 steel near the fusing line. |
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| Keywords: | T91/Inconel601 dissimilar steel weld joint failure creep damage |
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