TP347H奥氏体不锈钢锅炉管开裂原因分析  

Cracking Cause Analysis for TP347H Austenitic Stainless Steel Boiler Tube

作　　者：郑坊平[1] 张红军[1] 高磊[1] 刘森[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032

出　　处：《热加工工艺》2014年第21期225-228,共4页Hot Working Technology

摘　　要：通过宏观检查、化学成分分析、金相检验、硬度试验、断口分析及能谱分析等方法,对某电厂超临界锅炉末级再热器奥氏体不锈钢管的开裂原因进行了分析。结果表明:TP347H异径管的横向开裂是在材质处于敏化状态、管子晶界受损的条件下,应力集中薄弱部位受轴向工作应力、弯矩和一定的焊接残余应力,发生了由外壁向内壁扩展的沿晶应力腐蚀开裂。By visual testing, chemical composition analysis, metallographic examination, hardness testing, fracture analysis and energy spectrum analysis, the cracking causes for austenitic stainless steel of finishing reheater in supercritical boiler were analyzed. The results show that the transverse crack of TP347H reducer is intergranular stress corrosion cracking, which is from outside wall into inside wall, when the material is in the sensitized state and the tube grain boundary damages, and the stress concentration part has the axial working stress, bending moment and welding residual stress.

关 键 词：奥氏体不锈钢 材质敏化 沿晶应力腐蚀 横向开裂 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—金属材料]