Abstract
Microstructural paths of hydrogen-assisted fatigue crack growth (HAFCG) in tempered martensitic steels were investigated relying on martensite boundary characteristics. Factors determining the HAFCG paths were tensile strength (TS)-dependent. HAFCG paths occurred preferentially along prior austenite grain boundaries with a brittle trend in 1025-MPa-TS steel. However, 811-MPa-TS steel showed HAFCG predominantly along block boundaries with large plasticity evolution, indicating that the mechanism of HAFCG in lower-TS steel required the assistance of plasticity accumulation during cyclic loadings.
Graphical abstract
Notes
The fraction of PAGB crack in T550 was approximately 40 pct when considering trans-lath cracks, which was 10 to 20 pct higher than intergranular fracture area fraction measured in the previous study [8]. This mismatch is probably owing to measurement errors caused by the presence of plasticity-related traces on the fracture surfaces and a difference between two- and three-dimensional analyses.
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This work was supported financially by the Japan Society for the Promotion of Science (JSPS) KAKENHI (JP20H02457) and a research project entitled “Mechanism from incubation period to fracture in hydrogen embrittlement of high-strength steels” funded by the Iron and Steel Institute of Japan (ISIJ) and supported by JST, the establishment of university fellowships toward the creation of science technology innovation (JPMJFS2102). The authors acknowledge the cooperation of A. Setoyama for the preparation and provision of the tested CT specimens.
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Chen, T., Koyama, M., Ogawa, Y. et al. Martensite Boundary Characteristics on Cycle- and Time-Dependent Fatigue Crack Growth Paths of Tempered Lath Martensitic Steels in a 90 MPa Gaseous Hydrogen Atmosphere. Metall Mater Trans A 54, 2512–2518 (2023). https://doi.org/10.1007/s11661-023-07041-9
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DOI: https://doi.org/10.1007/s11661-023-07041-9