火电厂中铁素体/奥氏体钢焊接接头的蠕变断裂行为研究进展

Research Progress on Creep Rupture Behavior of Ferritic/AusteniticSteel Welded Joints in Thermal Power Plant

摘要: 综述了火电厂中铁素体/奥氏体钢焊接接头在服役过程中的显微组织演变和Ⅳ型裂纹的形成、扩展及蠕变断裂机制，重点分析了该类焊接接头薄弱位置的蠕变断裂行为，总结了铁素体钢热影响区发生蠕变断裂的影响因素，并给出了提高焊接接头蠕变性能的相关建议，最后对未来的研究方向进行了展望。

Abstract: The microstructure evolution, formation and propagation of type Ⅳ cracks, and creep rupture mechanism of ferritic/austenitic steel welded joints in thermal power plant during service are reviewed. The creep rupture behavior of weak position of the welded joints is emphatically analyzed. The influencing factors of creep rupture in the heat-affected zone of ferritic steel are summarized, and relevant suggestions for improving the creep performance of welded joints are given. Finally, the future research direction is prospected.