中文摘要：

采用热/力模拟试验机进行高温多道次变形的方法,研究了变形前不同保温温度对两种低碳钢（0.032C-0.25Mn、0.165C-0.38Mn）显微组织和力学性能的影响,旨在合理制定低碳钢的热轧工艺参数和促进低温加热技术的应用。研究结果发现,变形前保温温度的降低对0.032C-0.25Mn钢变形后的组织与性能影响不大,但对于0.165C-0.38Mn钢而言,保温温度的降低会促进针状铁素体的形成,提高钢的硬度和强度,根据再结晶动力学原理分析,这是由于初始奥氏体晶粒尺寸较小造成的。

英文摘要：

The influences of soaking temperature before multi-pass hot rolling on the microstructure and mechanical properties of two low carbon steels （0. 032C - 0.25Mn, 0. 165C -0.38Mn） were studied by high temperature multi-pass deformation test on the thermal/power simulation machine in order to develop the hot rolling system of low carbon steel and to promote the low temperature heating technology. The result showed that the microstrueture and mechanical properties of 0. 032C - 0.25Mn steel were almost not affected by reducing soaking temperature, but the acicular ferrite formed in 0. 165C -0.38Mn steel and its hardness and strength was improved as the soaking temperature reduced, which was due to its smaller original austenite grain size according to the recrystallization kinetics theory analysis.