一种非调质连杆用高碳微合金钢的热变形行为

用Gleeble-3500热力模拟试验机在温度为1 223～1 323 K,应变速率为0.2～10 s-1的条件下对一种非调质连杆用高碳微合金钢进行了热压缩变形试验,测得了其流变曲线,并观察了变形后的组织.试验结果表明,流变应力和峰值应变随变形温度的降低和应变速率的提高而增大.试验用钢在真应变为0.8,温度为1 223～1 323 K,应变速率为0.2～10 s-1的条件下,发生完全动态再结晶.测得试验用钢的热变形激活能为289.9 kJ/mol,并得出了其热变形方程,以及动态再结晶晶粒尺寸与Zener-Hollomon参数之间的关系和动态再结晶状态图.

Hot Deformation Behavior of a Non-quenched High Carbon Microalloyed Steel for Connecting Rod

The hot compression deformation behavior of a non-quenched high carbon microalloyed steel for connecting rod was investigated on Gleeble-3500 simulator at the temperature range of 1 223-1 323 K and strain rate of 0.2- 10 s^-1. The corresponding flow curves were measured and hot deformation microstructures were observed. The resuits show that the flow stress and peak strain increase with either increasing strain rate or decreasing deformation temperature. When the true strain is 0.8 and deformation temperature is in the range of 1 223 - 1323 K, full dynamic recrystallization occurs in the test steel at strain rate of 0.2-10 s^-1. The hot deformation activation energy Q of test steel is 289.9 kJ/mol. The thermal deformation equation, dynamic recrystallization diagram and the relationship between the size of dynamic recrystallized grains and Zener-Hollomon parameter were obtained.