Thermal fatigue behavior of 441 ferritic stainless steel in air and synthetic automotive exhaust gas

作     者：ZHAN JianMing BI HongYun LI MouCheng ZHAN JianMing;BI HongYun;LI MouCheng

作者机构：Materials Genome InstituteShanghai UniversityShanghai 200072China Research InstituteBaoshan Iron&Steel Co.Ltd.Shanghai 200431China Institute of MaterialsSchool of Materials Science and EngineeringShanghai UniversityShanghai 200072China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2022年第65卷第1期

页      面：169-178页

核心收录：

学科分类：08[工学] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China and Baowu Steel Group Co. Ltd.(Grant No.U1660205) 

主　　题：stainless steel automobile exhaust gas thermal fatigue oxidation precipitation 

摘      要：The thermal fatigue behavior of 441 ferritic stainless steel was investigated in air and synthetic automotive exhaust gas by the cyclic tests under 100℃-800℃ and 900℃ *** the fracture failure,the microstructure,oxide film,and precipitated phases were analyzed using optical microscopy,X-ray diffraction,scanning electron microscopy,and transmission electron *** both atmospheres,increasing the maximum temperature from 800℃ to 900℃ results in lower strength and fatigue life and higher elongation and grain *** the same maximum temperature,the thermal fatigue life of the specimen is lower in the synthetic exhaust gas than in the *** the higher maximum temperature and the synthetic exhaust gas facilitate fatigue *** failure mechanism is discussed according to the grain size,thermal stress,high-temperature oxidation rate,and the precipitation of secondary *** precipitated carbides play an important role in the rapid fatigue failure of specimens in the synthetic exhaust gas.