Nanoindentation Characterization of Creep-fatigue Interaction on Local Creep Behavior of P92 Steel Welded Joint

作     者：Yuxuan Song Yi Ma Zhouxin Pan Yuebing Li Taihua Zhang Zengliang Gao Yuxuan Song;Yi Ma;Zhouxin Pan;Yuebing Li;Taihua Zhang;Zengliang Gao

作者机构：Institute of Process Equipment and Control EngineeringCollege of Mechanical EngineeringZhejiang University of TechnologyHangzhou 310014China Institute of Micro/Nano‑Mechanical Testing Technology&ApplicationCollege of Mechanical EngineeringZhejiang University of TechnologyHangzhou 310014China Institute of Solid MechanicsBeihang UniversityBeijing 100000China Engineering Research Center of Process Equipment and Re‑manufacturingMinistry of EducationHangzhou 310014China 

出 版 物：《Chinese Journal of Mechanical Engineering》 (中国机械工程学报（英文版）)

年 卷 期：2021年第34卷第6期

页      面：85-97页

核心收录：

学科分类：080503[工学-材料加工工程] 080802[工学-电力系统及其自动化] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Supported by National 13th Five-Year Key Technologies R&D Program of China(Grant No.2016YFC0801902) National Natural Science Foundation of China(Grant No.11727803,11672356,52075490) Fundamental Research Funds for the Provincial Universities of Zhejiang(Grant No.RF-A2020010) 

主　　题：P92 steel Welded joint Creep-fatigue interaction Nanoindentation Creep behavior 

摘      要：In modern fossil and nuclear power plants,the components are subjected to creep,fatigue,and creep-fatigue(CF)due to frequent start-up and shut-down operations at high *** CF interaction on the in-service P92 steel welded joint was investigated by strain-controlled CF tests with different dwell times of 30,120,300,600 and 900 s at 650℃.Based on the observations of the fracture surface by scanning electron microscope(SEM),the character-istic microstructure of fatigue-induced damage was found for the CF specimens with short dwell times(30 and 120 s).The hardness,elastic modulus and creep deformation near the fracture edges of four typical CF specimens with 30,120,600 and 900 s dwell times were measured by *** to specimens with post-weld heat treatment(PWHT),lower hardness and creep strength were found for all CF *** addition,significant reduc-tions in hardness,elastic modulus,and creep strength were measured near the fracture edges for the CF specimens with short dwell times compared to the PWHT *** to PWHT specimens(0.007),the increased strain rate sensitivities(SRS)of 0.010 to 0.17 were estimated from secondary *** increased values of SRS indicate that the room temperature creeps behavior is strongly affected by the decrease in dislocation density after the CF tests.