T91钢焊缝硬度偏高分析及建议  

Analysis and Prevention Measures of High Hardness of T91 Steel Welded Joints

作　　者：刘响亮[1] 冯琳杰[2] 王理博[1] 吴利飞[3] 穆思思 任兵兵[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032 [2]华能平凉电厂,甘肃平凉744032 [3]上海锅炉厂有限公司,上海200245

出　　处：《热加工工艺》2016年第3期251-253,共3页Hot Working Technology

摘　　要：对某电厂1000 MW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。The hardness, tensile, bending and metallographic tests of welded joints of T91 steel for superheater of a boiler in 1000MW unit were conducted. The metallurgical structure of welded joints was coarse lath martensitic and its hardness was higher than that of upper specification. Consequently, fracture happens easily during bending test because of too high hardness, excessive heat input during welding and improper operation of heat treatment. Less welding heat input and bulk heat treatment afterwards were recommended to avoid high hardness of welded joints.

关 键 词：锅炉 过热器 T91 焊缝 硬度 

分 类 号：TG457.11[金属学及工艺—焊接]