저 T/Tm 온도에서 공석강 및 과공석강의 시간의존성 소성변형 기구 = Mechanisms of Time-dependent Plastic Deformation of Eutectoid and Hypereutectoid Steels at Low T/Tm Temperatures

다국어 초록 (Multilingual Abstract)

The rate-controlling mechanisms for time-dependent plastic deformation of eutectoid and hyper-eutectoid pearlitic steels at low T/Tm temperatures were explored. The strain rate - stress data obtained from a series of constant load tensile tests at 0.25~0.30 T/Tm were applied to the power law, the lattice friction controlled plasticity, and the obstacle controlled plasticity. Of these models, the obstacle controlled plasticity was found to best-describe the rate-controlling mechanism for time-dependent plastic deformation of two steels at low T/Tm temperatures in terms of the activation energy for overcoming the obstacles against dislocation glide in ferrite. The deformed microstructures revealed the dislocation forests of a high density as the main obstacles. In addition, the obstacle controlled plasticity well-explained the effects of cementite on the 0°K flow stress of two steels.

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