HYDROGEN EMBRITTLEMENT SUSCEPTIBILITY OF L485MB PIPELINE STEEL AND WELD THROUGH TENSILE TESTING WITH DIFFERENT STRESS TRIAXIALITIES

With the ambition to reuse existing pipelines for hydrogen transport and/or storage, the industry is looking for ways to timely and reliably evaluate pipeline steels and welds for their hydrogen embrittlement sensitivity. A L485MB steel and weld are screened in this work, based on ex-situ tensile testing of hydrogen-charged specimens. Additionally, the effect of notches to generate stress triaxiality in tensile specimens is investigated . The paper reveals differences in the hydrogen embrittlement sensitivity of different materials, at different stress triaxiality levels.
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