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本文对 HQ80C 和 HQ100 钢在不同温度、不同应变速率下的屈服强度进行了研究。发现在不同温度的τ_s-lg(?)关系曲线上,Rosenfield 定义的Ⅰ区和Ⅱ区同属于位错运动的热激活机制。将Dorn-Rajnak 理论用于本研究,证明本文所研究的两种材料的形变对温度和应变速率敏感的机理是位错运动的 Peierls 机制中的 P-N 力对其敏感所致。
In this paper, the yield strength of HQ80C and HQ100 steel at different temperatures and different strain rates were studied. It is found that the region Ⅰ and Ⅱ defined by Rosenfield belong to the thermal activation mechanism of dislocation movement at the τ_s-lg (?) Curves at different temperatures. The Dorn-Rajnak theory was used in this study to show that the mechanism of the susceptibility of the two materials studied to temperature and strain rate is sensitive to the P-N force in the Peierls mechanism of dislocation motion.