Abstract: The deformation resistance of niobium steel 0. 05C, 1. 44Mn, 0. 13Nb with austenite grain size 800 μm during control rolling at 900 ~ 1 050 °C with deformation rate 1 ~ 20 s ~ and true strain 0 -0. 7 has been studied by Thermecomaster-Z thermal simulation test machine, and a regression equation for deformation resistance is established. Test results showed that with increasing temperature, deformation resistance of niobium steel in austenite region decreased, at same temperature with increasing straining, deformation resistance of steel increased, and at given straining deformation resistance increased with increasing deformation rate. The difference in deformation resistance between calculation value by regression equation and measured value was W5 MPa.

摘要： 通过Thermecmastor-Z热模拟试验机,在900-1 050℃以变形速率1-20 s-1、真应变0-0．7研究了晶粒尺寸800μm的铌钢(％:0．05C、1．44Mn、0．13Nb)奥氏体控轧过程的变形抗力,并建立了变形抗力的回归方程。试验结果表明,随温度增高,铌钢在奥氏体区变形抗力递减;在同一温度下,随变形程度增加,钢的变形抗力增加;同时在给定变形程度下,变形抗力随变形速率增大而增大;变形抗力回归方程计算值与实测值相差≤5 MPa。

关键词: 铌钢, 奥氏体, 热轧参数, 变形抗力, 数学模型