Effect of thermal and mechanical factor on type IV creep cracking of P92 steel

摘要：

Early damage of Type IV cracking will occur in main steam pipelines of new heat-resistant steel, such as P92 subjected to high temperature and high pressure in the period of long-term service. Welded joint is considered to be the weak link. However, the mechanism of Type IV cracking has not yet been understood unequivocally. The simulation of temperature field and welding residual stress for welded joint of P92 main steam pipeline is demonstrated using finite element software of ABAQUS. Experimental measured data obtained from infrared thermal imaging system and X-ray diffraction technique are conducted to verify simulation. The simulation result and experimental data were in good agreement. The research results show that: (a) thermo-cycle curve play an important role in Type IV cracking, (b) The concentration of welding residual stress results in maximal equivalent stress. The equivalent stress is a crucial cause inducing Type IV cracking.

关键词： P92 steel Type IV cracking Temperature field Welding residual stress Equivalent stress Finite element simulation Experiment

作者: Xiaojun Hao Xiaoguang Niu Zhen Dai Shangqian Jing Changfu Liu Guozhen Dong

作者单位: Hebei Electric Power Research Institute, Shijiazhuang 050021, China Guodian Science and Technology Research Institute, Nanjing 210031, China

会议类型: 国际会议

会议名称: 2012 International Symposium on Structural Integrity 2012国际结构完整性学术研讨会 ISSI 2012

会议地点: 济南

会议语种:英文

页码: 301-306

在线出版日期: 2012-10-31（万方平台首次上网日期，不代表论文的发表时间）