文献类型：期刊文献

英文题名：Build direction-mediated microstructural regulation of passive film stability in selective laser melted 316L stainless steel

作者：Huang, Yangming[1,2];Li, Yajing[1];Tan, Bowen[1];Huang, Yuhui[1,2];Xuan, Fu-Zhen[1];Yang, Bo[3]

机构：[1]East China Univ Sci & Technol, Minist Educ, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China;[2]Shanghai Inst Aircraft Mech & Control, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Shanghai Inst Special Equipment Inspect & Tech Res, Shanghai 200062, Peoples R China

年份：2026

卷号：41

起止页码：6688

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：;EI(收录号：20261020216728);WOS:【SCI-EXPANDED(收录号:WOS:001709422200001)】；

基金：This work was financially sponsored by National Natural Science Foundation of China (Grant No. 52375147 and Grant No. 5250053816) . State Administration for Market Regulation Science and Technology Program (Grant No. 2024MK029) , Shanghai Gaofeng Project for Uni-versity Academic Program also sponsored this work.

语种：英文

外文关键词：Selective laser melting; Build orientation; 316L stainless steel; Electrochemical property; Passive film

摘要：This study systematically investigates the influence of build directions (BDs) (0 degrees, 45 degrees, 90 degrees) on the passive film stability of selective laser melted (SLM) 316L stainless steel in a simulated marine environment (3.5 wt% NaCl solution). Through a combination of microstructural characterization, residual stress measurement, and electrochemical testing, the intrinsic mechanisms by which BD governs corrosion resistance via the modulation of grain orientation, texture, residual stress and dislocation density were elucidated. The results indicate that the 0 degrees BD specimen, characterized by a high fraction of <111>-oriented grains, moderate grain size, the highest proportion of low-angle grain boundaries, and the highest geometrically necessary dislocation density, formed the most compact and stable passive film. In contrast, the 45 degrees built specimen exhibited the poorest corrosion resistance due to coarse grains and unfavorable texture, while the 90 degrees BD specimen showed intermediate performance. Analysis of passive film kinetics and pitting morphology further corroborated this performance hierarchy. This work provides critical insights for tailoring the microstructure through SLM processing to enhance the service reliability of additively manufactured stainless steel components in aggressive environments.