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Hyung-Seop Shin(신형섭),Juho Yeo(여주호),Jaewon Cho(조재원),Eunsu Min(민은수),Un-Bong Baek(백운봉) 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.5
Recently, ANU group has established a simple screening technique for hydrogen embrittlement compatibility of steels, which is adopting an in-situ small-punch (SP) test method and corresponding to the ‘external hydrogen’ condition, and proposed a characterizing factor which is suitable for the SP test. The technique is based on the quantitative evaluation of the hydrogen embrittlement (HE) behaviors of various structural steels for hydrogen energy facilities. To investigate the HE compatibility of metallic materials, the in-situ SP tests were carried out under a high-pressure hydrogen gas environment and at the temperature ranges sensitive to HE. Through the measurement of the reduction of thickness (ROT) at the fractured part of the specimen after SP tests under both H2 and inert gas environments, the relative reduction of thickness (RRT) due to HE can be obtained. The RRT has a similar physical meaning to the relative reduction of area (RRA) obtained by the conventional slow strain-rate tensile test (SSRT), since both factors are based on the ductility induced under hydrogen environments. In this study, it is tried to investigate the hydrogen embrittlement (HE) behaviors of pipeline steels and welds by the in-situ SP test. The ductility-based RRT obtained by in-situ SP tests was used to quantify the HE sensitivity of the base metal and welds under various test conditions corresponding to practical use environments of hydrogen devices. This study will contribute to confirm the validity of in-situ SP tests as a simple test method for the quantitative evaluation of the HE susceptibility of pipeline steel welds.
인시츄 SP시험을 사용한 노치를 갖는 STS316L강 시험편의 수소취화에 따른 파괴거동 평가
조재원(Jae-Won Cho),민은수(Eun-Su Min),신형섭(Hyung-Seop Shin) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Recently, as hydrogen energy is used as new energy sources such as hydrogen fuel cell vehicles and hydrogen stations, to ensure the safety must be considered in the design of facilities for production/storage/transportation of hydrogen gas. Hydrogen atoms are small in size, so they penetrate into metals in high-pressure environments and cause embrittlement damage, eventually reducing mechanical properties. In the case of structure design with a notch, it may be vulnerable to the failure due to stress concentration. Therefore, it is also important to study how the notch affect the failure mechanism the high-pressure hydrogen environments. In this study, a U-shaped notch was introduced into the STS316L steel specimen and the effect of the notch on hydrogen embrittlement was investigated using the small punch test method (SP test) in high-pressure hydrogen environments at RT and -40℃.