Creep behavior and microstructural evolution of P92 steel used in ultra supercritical plants

摘要：

Creep behavior and microstructural evolution during creep exposure were investigated in ASME grade 92 steel. Creep tests were carried out at 650℃ under varied load. The microstructures of the creep specimens were analyzed by optical microscopy, and the precipitations were identified by Scanning Electron Microscopy (SEM) equipped with an energydispersive X-ray spectrometry. Creep rupture specimens show that creep fracture mode is ductile fracture, and the value of stress exponent is 13.9 at 650℃. During creep exposure, martensitic lath structure and grain size do not change a lot, and only enlarge the size of grain slightly. On the other hand, the precipitation of MX is stable, but the coarsening rate of M23C6 is fast, and Laves phase nucleates and grows rapidly during creep at 650℃.

关键词： P92 steel Ultra Supercritical (USC) Creep Microstructure

作者: Xiaofeng Guo Jianming Gong Yong Jiang

作者单位: School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China

会议类型: 国际会议

会议名称: 2011 International Symposium on Structural Integrity 2011国际结构完整性学术研讨会--核工程结构完整性技术 ISSI 2011

会议地点: 合肥

会议语种:英文

页码: 133-137

在线出版日期: 2011-10-27（万方平台首次上网日期，不代表论文的发表时间）