S0305-3-4 非拡散性水素吸蔵条件下における伸線強加工高強度鋼の疲労き裂進展に及ぼす応力比の影響([S0305-3]き裂進展)

概要

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We investigated the mechanical condition for the irreversible hydrogen desorption under cyclic loading condition using the fatigue crack growth tests and hydrogen visualization analysis. The sample was a cold drawn high strength steel. The fatigue crack growth rate was accelerated by irreversible hydrogen. However, the fatigue crack growth rate in terms of ΔK_<eff> was independent of the stress ratio. To investigate the behavior of irreversible hydrogen near a crack tip and notch root under cyclic loading condition, we applied a hydrogen microprint technique to the fatigue tests. After the fatigue test, silver particles precipitated along the fatigue crack and notch root, and thus this indicates that irreversible hydrogen is desorbed from the trap site not only near the fatigue crack but also near the notch root under cyclic loading. The mechanical condition for irreversible hydrogen desorption was discussed by the finite element analysis and hydrogen visualization analysis.
2010-09-04