35CrMnSi钢温成形力学行为研究

Mechanical behaviour of 35CrMnSi during warm-formation

为了合理制定35CrMnSi钢温成形工艺参数,利用热模拟实验对该材料在温成形条件下的变形抗力进行了研究,考察了变形温度、应变速率及变形程度与变形抗力之间的关系,并利用冶金学的方法对其进行了分析.结果表明:35CrMnSi钢在740～860℃变形时,具有较强的应变速率敏感性,变形抗力随应变速率的增加而上升;随应变速率的增大,温度对变形抗力的影响减弱;在较低温度成形时(740、780℃),变形抗力较低,并有明显的软化趋势;随着成形温度的升高,材料在发生相变后变形抗力上升,且表现出加工硬化的趋势.

In order to establish the warmformation process parameter for 35CrMnSi, the deformation resistance of this steel during warm formation has been studied through experiments made with a Gleeble machine, and the relationship among deformation temperature, strain rate, degree of deformation and deformation resistance has been established through metallurgical examinations. The results indicated that, at a temperature in the range of 740～860 ℃, the strainrate sensitivity of 35CrMnSi was obvious and the deformation resistance increased as the strain rate rose; the influence of temperature on deformation resistance decreased as the strain rate increased; at a lower temperature, the deformation resistance was lower and a softening trend was obvious; as temperature rose, deformation resistance slightly increased after phase transformation happened, and a trend of work hardening was obvious.