Journal
FRONTIERS IN MATERIALS
Volume 7, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmats.2020.620000
Keywords
dual phase steels; hydrogen embrittlement; hydrogen diffusion; martensite content; slow strain rate tensile test
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Funding
- National Natural Science Foundation of China [51871171, 51871172]
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The hydrogen diffusion behavior and hydrogen embrittlement susceptibility of dual phase (DP) steels with different martensite content were investigated using the slow strain-rate tensile test and hydrogen permeation measurement. Results showed that a logarithmic relationship was established between the hydrogen embrittlement index (I (HE)) and the effective hydrogen diffusion coefficient (D (eff)). When the martensite content is low, ferrite/martensite interface behaves as the main trap that captures the hydrogen atoms. Also, when the D (eff) decreases, I (HE) increases with increasing martensite content. However, when the martensite content reaches approximately 68.3%, the martensite grains start to form a continuous network, D (eff) reaches a plateau and I (HE) continues to increase. This is mainly related to the reduction of carbon content in martensite and the length of ferrite/martensite interface, which promotes the diffusion of hydrogen atoms in martensite and the aggregation of hydrogen atoms at the ferrite/martensite interface. Finally, a model describing the mechanism of microstructure-driven hydrogen diffusion with different martensite distribution was established.
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