热加工图对节约型双相不锈钢2101表面裂纹的预测

采用THEMOMASTER-Z热模拟试验机对节约型双相不锈钢2101在变形温度950～1150℃、应变速率0.01～30s-1及真应变0.8的条件下进行高温压缩试验。在较低变形温度或较高应变速率区域变形时,试验钢在环形拉应力的作用下,在试样鼓肚处易出现与压缩轴呈45 的表面裂纹。利用试验数据分别采用动态材料模型理论和塑性功方法构建热加工图对试验钢表面裂纹进行预测。基于动态材料模型构建得到的热加工图与试验钢表面裂纹存在较大差别,而基于塑性功方法构建得到的热加工图对压缩试样表面裂纹的预测结果与试验结果基本吻合。

Prediction of Surface Cracks in Lean Duplex Stainless Steel 2101 by Using Processing Map

The hot compression test of the lean duplex stainless steel 2101 was conducted on THEMOMASTER-Z thermal mechanical simulator at a temperature range of 950～1150C, and strain rate range of 0.130s-1 with true strain 0.8. Surface cracks, which is at angle approximately of 45° to the compression axis are pone to appear at higher strain rates and lower temperatures. In order to predict the surface cracks of the material, processing map based on dynamic material modeling (DMM) and specific plastic work approaches were established by using tested data. The evaluation of the surface cracks of the deformed samples, in the case of the present study, did not reach any firm relationship between processing maps, which based on DMM and surface cracks. While, the predicted results using specific plastic work approach matched well with the surface cracks.