Effect of laser power on hydrogen embrittlement and microstructural evolution in selective laser melted 304L austenitic stainless steel

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Science Pub Date : 2025-02-22 DOI:10.1016/j.corsci.2025.112814

Chilou Zhou , Xinrui Yan , Yulin Long , Junyang Chen , Xinfeng Li , Xiang Li

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Abstract

The effect of laser power on hydrogen embrittlement (HE) and microstructural evolution in selective laser melted (SLM) 304 L stainless steel was systematically investigated. Slow strain rate tensile (SSRT) tests, X-ray diffraction (XRD), electron backscatter diffraction (EBSD), and hydrogen microprint technique (HMT) were employed to analyze HE susceptibility and mechanism of SLM 304 L. Results show that hydrogen embrittlement resistance decreases with increasing laser power, with 150 W yielding the highest resistance (HEI = 0.963). Microstructural analysis indicated that cellular structures with high-density dislocation walls acted as hydrogen traps, reducing hydrogen accumulation at grain boundaries and suppressing intergranular fracture. Furthermore, increasing laser power led to grain coarsening and a decrease in dislocation density, and promoting HE. These findings provide insight into the correlation between SLM parameters, microstructure, and HE behavior.

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激光功率对304L奥氏体不锈钢选择性激光熔化氢脆及组织演变的影响

系统研究了激光功率对选择性激光熔化304 L不锈钢氢脆（HE）和微观组织演变的影响。采用慢应变速率拉伸（SSRT）、x射线衍射（XRD）、电子背散射衍射（EBSD）和氢微印技术（HMT）分析了SLM 304 L的HE敏感性及其机理。结果表明：随着激光功率的增加，合金的抗氢脆性能逐渐降低，其中150 W的抗氢脆性能最高（HEI = 0.963）；显微组织分析表明，具有高密度位错壁的胞状结构起到了氢阱的作用，减少了氢在晶界的积聚，抑制了晶间断裂。激光功率的增加导致晶粒粗化和位错密度的降低，促进了HE的产生。这些发现有助于深入了解SLM参数、微观结构和HE行为之间的相关性。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.