2101不锈钢在热变形过程中表面裂纹分析及计算机预测

Analysis and Predicting of Surface Cracks of 2101 Stainless Steel in Thermal Deformation

利用Themomaster-Z热模拟实验机、动态材料模型理论和塑性功构建热加工图,预测LDX2101不锈钢在热变形过程中的裂纹产生条件。结果表明,试验钢在低变形温度或高应变速率时均会出现表面裂纹,且裂纹均由环形拉应力导致;表面裂纹与功率耗散图无必然的对应关系;Prasad稳定性判据对于本次试验表面裂纹预测失效,而Gegel判据预测的失稳区超过了表面裂纹区域,同样不适用于表面裂纹的预测;以塑性功方法建立热加工图对裂纹的预测与试验结果相符,临界值为70 N·m/m2。

Using Themomaster-Z hot simulation experiment machine, dynamic materials model theory and the hot working diagram of plastic work constructions, the cracking formation conditions of LDX2101stainless steel was predicted. The results show that low deformation temperatures and high deformation rates can lead to steel surface cracking, which results from circular tensile stress; there is no correspond relationship between steel surface cracks and power dissipation figures; Prasad stability criterion is failed to use in steel surface cracks prediction, and the area of losing stability predicted by Gegel criterion is out of the steel surface area, the criterion is not suitable for the prediction. The method of using plastic work method to establish the hot working diagram has the best coherence with the real data, and can be used to predict the experimental results with the critical value of 70 N· m/m^2.