论文部分内容阅读
用Gleeble-3500热力模拟试验机对一种中碳曲轴用非调质钢进行1 223~1 473 K和0.2~10 s-1的热压缩变形,获得了其流变曲线,并给出了试验用钢的热变形方程式、动态组织状态图、动态再结晶晶粒尺寸与Z参数之间以及动态再结晶分数与应变量之间的定量关系式。结果表明,试验用钢的流变应力和峰值应变均随变形温度的降低和应变速率的提高而增大,动态再结晶晶粒平均尺寸随着变形Z参数的增大而减小,Z参数越大,发生动态再结晶和完全动态再结晶所需的应变也越大。
The rheological curves were obtained by hot compression deformation of 1 223 ~ 1 473 K and 0.2 ~ 10 s-1 for non-quenched and tempered steel of medium carbon crankshafts with a Gleeble-3500 thermal simulation machine. The experimental results The thermal deformation equations of steel, dynamic state diagram, dynamic recrystallization grain size and Z parameters, as well as between dynamic recrystallization fraction and strain quantitative relationship between the formula. The results show that the flow stress and peak strain of test steel increase with the decrease of deformation temperature and strain rate. The average size of dynamic recrystallization grains decreases with the increase of deformation Z parameter. The more the Z parameter Large, the greater the strain required for dynamic recrystallization and complete dynamic recrystallization.