[논문]Influence of Specimen Surface Roughness on Hydrogen Embrittlement Induced in Austenitic Steels during In-Situ Small Punch Testing in High-Pressure Hydrogen Environments

Shin, Hyung-Seop; Yeo, Juho; Baek, Un-Bong

doi:10.3390/met11101579

[해외논문] Influence of Specimen Surface Roughness on Hydrogen Embrittlement Induced in Austenitic Steels during In-Situ Small Punch Testing in High-Pressure Hydrogen Environments 원문보기

Metals, v.11 no.10, 2021년, pp.1579 -

Shin, Hyung-Seop (Department of Mechanical Design Engineering, Andong National University, 1375 Gyeongdong-ro, Andong 36729, Korea) , Yeo, Juho (Department of Mechanical Design Engineering, Andong National University, 1375 Gyeongdong-ro, Andong 36729, Korea) , Baek, Un-Bong (Team of Hydrogen Energy Materials Research, Korea Research Institute of Standards and Science, Daejeon 34113, Korea)

Abstract ▼ AI-Helper

An in-situ small punch (SP) test method has recently been developed as a simple screening technique for evaluating the properties of metallic materials used in high-pressure hydrogen environments. With this method, the test conditions including temperature and gas pressure can easily be adjusted to those used in practice. In this study, specimens of STS316L steel and 18 wt% Mn steel were prepared at two different surface roughness, fabricated using wire-cutting and mechanical polishing. Their effects on hydrogen embrittlement (HE) were evaluated using in-situ SP testing at both room temperature and a lower temperature where HE was shown to occur under 10 MPa hydrogen. Both steels were evaluated using two variables obtained from in-situ SP testing, the SP energy, and the relative reduction of thickness (RRT), to quantitatively determine the effect of specimen surface roughness on HE susceptibility. Their fracture characteristics due to HE under 10 MPa hydrogen showed little difference with surface finish. Surface roughness had a negligible influence on these quantitative factors describing HE, indicating that it is not a dominant factor to be considered in in-situ SP testing when it is used to screen for HE compatibility in steels used in high-pressure hydrogen environments.

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