文献类型：期刊文献

英文题名：Creep crack propagation in additively manufactured 316L stainless steel: Experimental insights and numerical modeling

作者：Wu, Lin-Sen[1];Hu, Hua-Yan[1,2];Pan, Yu-Jie[1];Shu, Yang[1];Wang, Yong-Jie[1];Song, Miao[2,5];Wen, Jian-Feng[1,3,4];Tu, Shan-Tung[1,3]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China;[3]Shanghai Inst Aircraft Mech & Control, Shanghai 200237, Peoples R China;[4]Longyan Univ, Coll Phys & Mech & Elect Engn, Longyan 364012, Peoples R China;[5]Nucl Power Addit Mfg Key Lab Sichuan Prov, Chengdu 610213, Peoples R China

年份：2026

卷号：341

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20261820620893);WOS:【SCI-EXPANDED(收录号:WOS:001756340700001)】；

基金：We gratefully acknowledge the financial support of National Natural Science Foundation of China (No. 52475156) and the National Key Research and Development Program of China (2024YFF0618904) and the Shanghai Gaofeng Project for University Academic Program Development. MS acknowledges the support by National Natural Science Foundation of China (No. 12275176 and No.12575295) and Nuclear Power Additive Manufacturing Key Laboratory of Sichuan Province.

语种：英文

外文关键词：Additive manufacturing; 316L stainless steel; Creep damage; Creep crack growth; Finite element analysis

摘要：Creep crack propagation significantly limits the service life of additively manufactured (AM) components at high-temperature creep condition. However, the studies on the creep crack growth (CCG) behavior and the ability of crack propagation prediction in AM materials remain acutely scarce. In this work, the CCG behavior of as-built 316L stainless steel (SS), fabricated using laser powder bed fusion (LPBF) technique, was investigated under various initial stress intensity factors at 600 degrees C using compact tension specimens loaded parallel and perpendicular to the build direction, respectively. As expected, anisotropic crack growth rates were observed under low and moderate loads, with cracks propagating faster under perpendicular loading than under parallel loading, as the columnar grain boundaries provided an easier path for intergranular crack propagation. However, under high loads, isotropic crack growth rates were observed due to highstress-induced transgranular propagation under parallel loading, which likely increased the crack growth rate. Compared with documented data for conventional 316L SS, the steady-state CCG rate of LPBF 316L SS under perpendicular loading was approximately three times higher, whereas the rate in the parallel loading direction was comparable. Crack path analysis indicates that cracks propagate more easily along the grain boundaries between coarse and fine grains, likely due to higher stress concentrations at these boundaries that promote void nucleation and coalescence. Additionally, the Wen-Tu model was used to predict crack propagation rates and morphologies. The predicted results showed reasonable agreement with experimental data if the anisotropic uniaxial creep behavior of LPBF 316L SS is considered.