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通过分析热拉伸中空洞萌生、长大、聚合现象给出了空洞萌生应变和断裂应变的选取方法。采用热拉伸和有限元模拟相结合的方法给出了Mn18Cr18N钢韧性断裂温度区间内损伤临界值。对比热锻物理试验与有限元预报中空洞萌生和断裂发生的时机,结果发现:C+L准则预报结果与热锻试验中损伤的发生具有较高的一致性,而作为对照所选择的R+T准则对损伤过程的预报与试验结果偏差较大。
By analyzing the germination, growth and polymerization phenomenon of hot stretch hollow cavity, the method of choosing the cavitation strain and fracture strain is given. The damage critical value in the ductile fracture temperature range of Mn18Cr18N steel is given by the combination of hot drawing and finite element simulation. Comparing the timing of cavitation initiation and fracture in hot forging test and finite element prediction, we found that the predictions of C + L criterion are in good agreement with those of hot forging test. However, as a control, the R + T criterion on the damage process forecast and test results deviate large.