Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 52, Issue 9, Pages 4161-4169Publisher
SPRINGER
DOI: 10.1007/s11661-021-06376-5
Keywords
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Funding
- National Research Foundation of Korea (NRF) [2020R1A2B5B01001900]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government (MOTIE) [20203030040020]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20203030040020] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2020R1A2B5B01001900] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The simultaneous alloying of carbon and nitrogen did not decrease hydrogen diffusivity significantly in austenitic steel. During tensile straining, cracks initiated at grain boundaries and propagated along grain boundaries, twin boundaries, or paths where epsilon martensite was concentrated, resulting in mixed intergranular and transgranular fracture modes. However, the resistance to hydrogen embrittlement improved compared to single alloying of either carbon or nitrogen due to enhanced austenite stability.
Hydrogen diffusion and embrittlement in an austenitic steel with 0.2 wt pct carbon and 0.2 wt pct nitrogen were investigated. The simultaneous alloying of both carbon and nitrogen did not reduce hydrogen diffusivity more than single alloying of nitrogen due to the interaction between carbon and nitrogen. During tensile straining, a low density of cracks initiated at the grain boundaries at an early deformation stage. The cracks propagated either along the grain boundaries and twin boundaries, or the paths where epsilon martensite was concentrated, which resulted in mixed intergranular and transgranular fracture modes. Still, the resistance to hydrogen embrittlement improved in comparison with the single alloying of either carbon or nitrogen due to enhanced austenite stability.
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