T91钢焊缝硬度偏高分析及建议

Xiangliang LIU,Linjie FENG,Libo WANG,Lifei WU, Sisi MU,Bingbing REN

Hot Working Technology（2016）

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Abstract

对某电厂1000MW机组锅炉过热器管屏T91钢对接焊缝进行了硬度测量、拉伸试验、弯曲试验、金相组织观察和焊接、热处理工艺分析.结果表明,硬度高于标准要求的焊缝金相组织为粗大的板条状马氏体,弯曲试验易发生断裂.分析认为,焊缝硬度高与焊接时线能量输入过大及热处理工艺执行不当有关,建议T91钢焊接应采用小的线能量输入,焊后最好进行整体热处理.

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