Roles of Hydrogen Content and Pre-strain on Damage Evolution of TRIP-aided Bainitic Ferrite Steel

DOI Web Site 参考文献19件 オープンアクセス
  • Verma Virendra Kumar
    Institute for Materials Research, Tohoku University Department of Mechanical Engineering, Kyushu University
  • Koyama Motomichi
    Institute for Materials Research, Tohoku University Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University
  • Kumai Bakuya
    Institute for Materials Research, Tohoku University School of Engineering, Tohoku University
  • Hojo Tomohiko
    Institute for Materials Research, Tohoku University
  • Akiyama Eiji
    Institute for Materials Research, Tohoku University

抄録

<p>From the aspect of crack/void initiation and growth characteristics, the effects of pre-strain on the hydrogen embrittlement resistance of a transformation-induced plasticity-aided bainitic ferrite steel were examined. The hydrogen uptake in the specimens without pre-strain caused degradation of crack growth resistance, but the crack initiation probability did not change significantly. It is noteworthy that the degree of degradation was independent of the hydrogen content in the present hydrogen charging condition. Pre-straining to 3% and 6% improved the crack growth resistance of the hydrogen-charged specimens because of a reduction in the probability of austenite presence at the crack tip. Furthermore, a high level of pre-strain provided high hydrogen concentration and resulted in strain-age-hardening, which caused an acceleration of quasi-cleavage fracture, an increase in yield strength, and a stress/strain concentration associated with Lüders deformation. These factors diminished the crack initiation resistance and crack growth resistance.</p>

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