文献类型：期刊文献

英文题名：Effect of surface modification on the high temperature low cycle fatigue performance of LPBF 316L austenitic steel

作者：Gu, Jiayuan[1,2];Wang, Xiaowei[1,2];Gao, Yuntao[1];Chen, Yefeng[1,2,3];Zhang, Zhen[4];Wen, Jianfeng[5];Gong, Jianming[1,2]

机构：[1]Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R China;[2]Nanjing Tech Univ, Inst Reliabil Ctr Mfg IRCM, Nanjing 211816, Peoples R China;[3]Ctr Excellence Adv Mat, Dongguan 523808, Guangdong, Peoples R China;[4]Nanjing Inst Technol, Sch Mat Sci & Engn, Nanjing 211167, Peoples R China;[5]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China

年份：2024

卷号：302

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20241615938722);WOS:【SCI-EXPANDED(收录号:WOS:001289046500001)】；

基金：The authors gratefully acknowledge the financial support of Guangdong Major Project of Basic and Applied Basic Research (No. 2020B0301030001) , the Key Project of University Natural Science Research in Jiangsu province (20KJA460002) , Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX21_1119) . Financial supports from National Natural Science Foundation of China (52122506) and National Science and Technology Major Project (J2019-IV-0010-0078) are gratefully acknowledged.

语种：英文

外文关键词：Low cycle fatigue; Laser powder bed fusion; 316L stainless Steel; Surface treatment; Fatigue life estimation

摘要：In this study, high temperature low cycle fatigue (LCF) tests at 550 degrees C were conducted on LPBF (Laser powder bed fusion) 316L with three different surface states, including the As-built surface (AB), fill contour (FC) manufacturing surface, and the surface combining FC and electropolishing (FC + EP). The effect of surface treatment on the high temperature LCF performance of LPBF 316L was investigated. Experimental results showed that the FC + EP surface treatment had the most significant effect on enhancing life. The difference in enhancing the fatigue life behavior was mainly attributed to the various crack initiation mechanisms with different surface states. The cracks on the surfaces of AB and FC mostly originate from the powder adhesion areas and the boundaries of the melt pool, while FC + EP surface treatment weaken the damage induced by powder adhesion. Furthermore, a parameter representing the fatigue crack propagation driving force that considers the surface condition has been defined, and a proposed life prediction model can provide guidance for surface modification and post-treatment of additive manufacturing materials as well as other metal materials.