Fatigue crack growth behavior of JIS SCM440 steel near fatigue threshold in 9-MPa hydrogen gas environment

• Published in: International journal of hydrogen energy 2017-05, Vol.42 (18), p.13158-13170
• Main Authors: Tazoe, Koki, Hamada, Shigeru, Noguchi, Hiroshi
• Format: Article
• Language: English
• Subjects: Crack propagation; Fatigue; Fatigue crack growth threshold; Hydrogen embrittlement; Low-alloy steel
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2017.03.223

In this study, stress intensity factor range (ΔK) decreasing tests were conducted and the in-situ observations were used to investigate the fatigue crack growth behavior of JIS SCM440 steel near the fatigue threshold in a 9-MPa hydrogen gas environment. The fatigue crack growth rate reflected the threshold behavior of the material, although the crack propagation knee point immediately before the threshold stress intensity factor range (ΔKth) could not be distinctly identified. The fatigue crack was also observed to exhibit uneven propagation immediately before ΔKth. In contrast, the knee points in a helium gas environment and air were very distinct. Fractographic analysis further revealed the existence of intergranular facets, which were observed immediately before ΔKth in the hydrogen gas environment. Conversely, no facet was observed immediately before ΔKth in the helium gas environment and air. The formation of the facets was considered to be one of the causes of the uneven crack propagation immediately before ΔKth in the hydrogen gas environment. •Near threshold fatigue crack growth behavior of JIS SCM440 in 9-MPa hydrogen.•Uneven crack propagation immediately before the threshold.•Macroscopic crack front had a wave-form with 3-mm wave-length.•Facet was one factor contributing to uneven crack propagation.