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Hydrogen Embrittlement of 27Cr−4Mo−2Ni Super Ferritic Stainless Steel
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Hydrogen Embrittlement of 27Cr−4Mo−2Ni Super Ferritic Stainless Steel
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Journal Article
Hydrogen Embrittlement of 27Cr−4Mo−2Ni Super Ferritic Stainless Steel
2024
Overview
The effect of hydrogen content on the deformation and fracture behavior of 27Cr−4Mo−2Ni super ferritic stainless steel (SFSS) was investigated in this study. It was shown that the plasticity and yield strength of SFSS were very susceptible to hydrogen content. The introduction of hydrogen led to a significant decrease in elongation and a concurrent increase in yield strength. Nevertheless, a critical threshold was identified in the elongation reduction, after which the elongation remained approximately constant even with more hydrogen introduced, while the yield strength exhibited a monotonic increase with increasing hydrogen content within the experimental range, attributed to the pinning effect of the hydrogen Cottrell atmosphere on dislocations. Furthermore, the hydrogen-charged SFSS shows an apparent drop in flow stress after upper yielding and a reduced work hardening rate during the subsequent plastic deformation. The more hydrogen is charged, the more the flow stress drops, and the lower the work hardening rate becomes.
Publisher
MDPI AG
Subject
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