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.
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.