The conditions of circumferential fracture during hot radial-shear rolling are simulated using QForm software. The fields of modified Cockroft–Latham criterion and temperature are plotted. The results of simulation were validated experimentally by rolling bars made of creep-resistant alloy. Controlled circumferential fracture was created by intensifying the self-heating by increasing the rolling speed. The fracture zone was examined metallographically. The experiment confirmed that the main cause of circumferential fracture of the workpiece during radial-shear rolling is the rapid self-heating in the fracture zone rather than the stress state and ductility of the material. These results were confirmed by examining the fracture zone with a microscope.

中文翻译：

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径向剪切热轧中圆周断裂条件的模拟与实验评价

采用QForm软件模拟径向剪切热轧过程中的圆周断裂情况。绘制了修正的 Cockroft-Latham 准则和温度的场。模拟结果通过由抗蠕变合金制成的轧制棒进行了实验验证。通过提高轧制速度来加强自热，从而产生受控的圆周断裂。对断裂带进行金相检查。实验证实，径向剪切轧制过程中工件圆周断裂的主要原因是断裂区的快速自热，而不是材料的应力状态和延展性。这些结果通过用显微镜检查断裂区来证实。