文献类型：期刊文献

英文题名：Stress corrosion cracking b ehavior of 316 L manufacture d by different additive manufacturing techniques in hydrofluoric acid vapor

作者：Dai, Hailong[1,2];Zhang, Shuyao[1,2];Li, Yajing[3];Yu, Jingtai[1,2];Kuang, Yue[1,2];Xuan, Fuzhen[3];Chen, Xu[1,2]

机构：[1]Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China;[2]Tianjin Key Lab Chem Proc Safety & Equipment Techn, Tianjin 300350, Peoples R China;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：191

起止页码：33

外文期刊名：JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20240615520775);WOS:【SCI-EXPANDED(收录号:WOS:001180293100001)】；

基金：This work was partially supported by the National Key Re- search and Development Program of China (Nos. 2022YFC30 0450 0 , 2018YFC0808600) , the Ningbo Natural Science Foundation (No. 2021J006) , and the China Postdoctoral Science Foundation (No. 2023TQ0113) , the Shanghai Pujiang Programme (No. 23PJD022) .

语种：英文

外文关键词：Selective laser melting; Directed energy deposition; Stress corrosion cracking; Dislocation cell

摘要：Selective laser melting (SLM) and directed energy deposition (DED), as two important additive manufacturing (AM) methods, have garnered widespread industrial applications attributing to their advantages in fabricating complex structures. Since the complex nature of microstructures produced by different AM technologies, it is necessary to carry out a thorough investigation of the stress corrosion cracking (SCC) behavior affected by these microstructures in harsh environments (i.e. hydrofluoric acid (HF)). In this study, the SCC susceptibility of DED and SLM-fabricated 316 L in HF vapor was first systematically studied by comparing it with commercial wrought (WR) 316 L to reveal the effect of microstructures (columnar crystals, melt pools, 8-ferrites, and dislocation cells) on the SCC behavior. Results show that DED-316 L has excellent SCC resistance and such resistance exhibits a low correlation with loading direction. This is because the reticulated distributed skeletal 8-ferrite facilitates enhancing film protection and hindering dislocation slip transfer. In contrast, SLM-316 L exhibits high SCC sensitivity together with a strong loading direction correlation. An SLM-316L-V with melt pool boundaries oriented perpendicular to the stress exhibits a high SCC tendency. Moreover, the dislocation cells without elemental segregation in SLM-316 L activate the corrosion reactivity and favor dislocation proliferation and transport, making SCC deterioration of SLM-316L-V in HF vapor. While a proper loading relationship can shield the adverse effect of dislocation cells on the stress corrosion of SLM-316 L (e.g. SLM-316L-H). Our effort s provide import ant theoretical guidance for the rational selection of fabrication technologies and microstructural design of materials in harsh environments. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.