On the improved hydrogen embrittlement resistance in stress relieved laser powder bed fused 316L stainless steel over the hot isostatic pressed equivalent

IF 7.4 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Liesbet Deconinck , Pedro A. Ferreirós , Haiyang Yu , Chandrahaasan Soundararajan , Roy Johnsen , Zaiqing Que , Xu Lu
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引用次数: 0

Abstract

The onset and mechanisms of hydrogen embrittlement are investigated in stress relieved (SR) and hot isostatic pressed (HIP) laser powder bed fused (L-PBF) 316L austenitic stainless steel. An improved resistance of SR L-PBF 316L to hydrogen-assisted degradation is uncovered by complementary modelling and in-depth experimental characterisation, including transmission electron microscopy. Novel insights show that the dislocation cells, characteristic for the SR L-PBF microstructure, form a beneficial hydrogen trap and establish an effective barrier against hydrogen-induced crack propagation and hydrogen embrittlement. Furthermore, the chemical heterogeneity in the dislocation cells contributes to crack arrest. In contrast, the mobile dislocations in HIP L-PBF 316L make this homogeneous microstructure significantly more prone to hydrogen embrittlement due to the promoted hydrogen-induced martensite formation, driving brittle crack propagation. Therefore, a dual HEDE-HELP synergetic mechanism is proposed for the hydrogen-induced embrittlement of SR L-PBF 316L, whereas HIP L-PBF 316L is dominated by the HEDE embrittlement mechanism. These insights highlight the potential of tailored post-processing in L-PBF microstructures, offering promising strategies to reduce hydrogen-assisted degradation in austenitic stainless steels.
激光粉末床熔接316L不锈钢在热等静压下抗氢脆性能的提高
研究了316L奥氏体不锈钢在应力消除(SR)和热等静压(HIP)激光粉末床熔合(L-PBF)过程中氢脆的发生和机理。通过互补模型和深入的实验表征,包括透射电子显微镜,发现了SR L-PBF 316L对氢辅助降解的抗性增强。新的见解表明,SR L-PBF微观结构的特征位错细胞形成了有益的氢阱,并建立了有效的屏障,防止氢诱导裂纹扩展和氢脆。此外,位错胞内的化学不均匀性有助于裂纹的止裂。相比之下,HIP L-PBF 316L中的移动位错促进了氢诱导马氏体的形成,使得这种均匀组织更容易发生氢脆,从而推动了脆性裂纹的扩展。因此,SR L-PBF 316L的氢致脆机制为HEDE- help双协同机制,而HIP L-PBF 316L的氢致脆机制为HEDE主导机制。这些见解突出了L-PBF显微组织定制后处理的潜力,为减少奥氏体不锈钢的氢辅助降解提供了有前途的策略。
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来源期刊
Corrosion Science
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.
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