Abstract
This work presents a comprehensive study of the hydrogen embrittlement (HE) behavior of a 13Cr-5Ni-2Mo supermartensitic stainless steel through two aspects: hydrogen diffusion and hydrogen concentration. Precipitated austenite reduced the effective hydrogen diffusion coefficient and hydrogen permeation flux, and thus increased the HE resistance. Further increasing the austenite content could not provide additional HE resistance as a martensitic transformation is prone to occur when a high hydrogen concentration and stress are coupled, leading to hydrogen induced crack initiation. The HE susceptibility of 13Cr-5Ni-2Mo steel is much higher than that of 960QC steel because of the higher adsorbing hydrogen concentration.
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