TY - GEN
T1 - Microscopic study on the effect of hydrogen on fatigue crack growth process in a chromium-molybdenum steel
AU - Takahashi, Y.
AU - Yamaguchi, K.
AU - Shigenaga, M.
AU - Tanaka, Masaki
AU - Higashida, K.
AU - Noguchi, Hiroshi
PY - 2009/12/1
Y1 - 2009/12/1
N2 - The effect of hydrogen atmosphere on the fatigue crack propagation property of JIS SCM435 chromium-molybdenum steel is investigated. The magnitude of fatigue crack propagation rate, da/dN, is significantly larger in hydrogen atmosphere than in helium atmosphere. The fracture surface and the near-tip cross-section are observed in detail by SEM and TEM respectively. The microscopic observations suggest that the fatigue crack propagation in helium is transgranular and dominated by plastic process. On the other hand, the fatigue crack propagation in hydrogen is brittle cracking along interface of grain and/or sub-grain structures. The crack seems to advance by unstable growth accompanied frequently by branching or deviation, which eventually results in the relatively large growth rate.
AB - The effect of hydrogen atmosphere on the fatigue crack propagation property of JIS SCM435 chromium-molybdenum steel is investigated. The magnitude of fatigue crack propagation rate, da/dN, is significantly larger in hydrogen atmosphere than in helium atmosphere. The fracture surface and the near-tip cross-section are observed in detail by SEM and TEM respectively. The microscopic observations suggest that the fatigue crack propagation in helium is transgranular and dominated by plastic process. On the other hand, the fatigue crack propagation in hydrogen is brittle cracking along interface of grain and/or sub-grain structures. The crack seems to advance by unstable growth accompanied frequently by branching or deviation, which eventually results in the relatively large growth rate.
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M3 - Conference contribution
AN - SCOPUS:84869791583
SN - 9781617382277
T3 - 12th International Conference on Fracture 2009, ICF-12
SP - 2416
EP - 2423
BT - 12th International Conference on Fracture 2009, ICF-12
T2 - 12th International Conference on Fracture 2009, ICF-12
Y2 - 12 July 2009 through 17 July 2009
ER -