Stress corrosion cracking behavior of 316 L manufactured by different additive manufacturing techniques in hydrofluoric acid vapor

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外文摘要：Selective laser melting(SLM)and directed energy deposition(DED),as two important additive manufac-turing(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,δ-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 δ-ferrite facilitates enhancing film protection and hindering dislocation slip transfer.In contrast,SLM-316 L exhibits high SCC sensitivity together with a strong load-ing 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 deterio-ration 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 efforts provide important theoretical guidance for the rational selection of fabrication technologies and microstructural design of materials in harsh environments.

外文关键词：

316 LSelective laser meltingDirected energy depositionStress corrosion crackingDislocation cell

作者：

Hailong Dai、Shuyao Zhang、Yajing Li、Jingtai Yu、Yue Kuang、Fuzhen Xuan、Xu Chen

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作者单位：

School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China

Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology,Tianjin 300350,China

School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China

基金：

National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNingbo Natural Science FoundationChina Postdoctoral Science FoundationShanghai Pujiang Programme

项目编号：

2022YFC30045002018YFC08086002021J0062023TQ011323PJD022

出版年：

2024

DOI：

10.1016/j.jmst.2023.12.041

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.191(24)