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采用C-Mn钢韧断机理的研究成果与点缺陷在应力场中的迁移运动规律, 分析了在高温下, 空
位对韧性断裂的微观过程的影响, 建立了中温范围内断裂韧度$J_{\rm IC}$和温度$T$的关系. 在
此基础上对多种压力容器钢断裂韧度的实验数据进行了分析, 最后验证了模型的合理性.

VARIATION OF FRACTURE TOUGHNESS OF METALLIC MATERIALS WITH TEMPERATURE

Using the results from the studies of C-Mn steel ductile fracture mechanisms and the laws of the stress-driven migration of point defects in a stress field, and with an analysis of the micro-process of ductile fracture induced by the vacancy coalescence at high temperatures, a relationship between the fracture toughness $J_{\rm IC}$ and temperature $T$ in the intermediate temperature range is derived from the vacancy concentration. Experimental data of fracture toughness of pressure vessel steels are analyzed. It is shown that there is a good agreement between the theoretical model and the experimental results.