Numerical simulation of mechanical controlling parameters for Type IV cracking on the welding joints of martensitic heat-resistant steel

作     者：Jian-Qiang ZHANG Bing-Yin YAO Tai-Jiang LI Fu-Guang LIU Ying-Lin ZHANG 

作者机构：State Key Lab of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China Xi'an Thermal Power Research Institute Co. Ltd Xi'an 710032 China School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China 

出 版 物：《中国高等学校学术文摘·材料科学》 (FRONTIERS OF MATERIALS SCIENCE IN CHINA)

年 卷 期：2010年第4卷第2期

页      面：210-216页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：the State Key Lab of Advanced Welding Production Technology  Harbin Institute of Technology and the Natural Science Fund of Hubei Province  China 

主　　题：martensitic heat-resistant steel Type Ⅳ cracking von Mises equivalent stress equivalent creep strain numerical simulation 

摘      要：The maximum principal stress, von Mises equivalent stress and equivalent creep strain in the welding joint of martensitic heat-resistant steel (9CrlMoVNb) are simulated by finite-element method (FEM) under the condition of 600℃ and applied stress of 80MPa. The results show that the maximum principal stress and von Mises equivalent stress are high on the curved points of two sides of the groove face near the fine-grain heataffected zone (HAZ). The creep strain mainly concentrates in the fine-grain HAZ; the maximum creep strain locates in the bottom of fine-grain HAZ of specimen. The stress triaxiality in the fine-grain HAZ is maximum, and creep cracking occurs because of the intensive constrain of base metal and weld. The simulation result is good in agreement with those of crack initiation site and propagation path by using the stress triaxiality as the mechanical controlling parameter of weld joint of martensite heat-resistant steel. Therefore, it is reasonable that the stress triaxiality is used for analysis initiation and propagation of Type IV cracking in the fine-grain HAZ.