用显微组织、力学性能和扫描电镜等方法,分析了1900 t/h超临界锅炉用TP347H高温过热器弯管在高温运行近1 000h下产生裂纹的原因,结果表明,TP347H奥氏体钢冷加工成形后未经过固溶处理,腐蚀敏感性增强.在高温及烟气、煤灰覆盖层等运行环境下,在综合应力的作用下,加速腐蚀过程,在弯头应力集中部位产生了晶间应力腐蚀裂纹.
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