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针对900 MPa级析出强化型热轧高强钢,利用Gleeble-3800热模拟试验机研究其在变形温度为950~1 150℃、变形速率为0.1~10 s-1条件下的压缩变形行为。根据应力-应变曲线图获得峰值应力,并用双曲正弦方程描述热压缩变形过程中的试验钢峰值应力与Zener-Hollomon参数的关系。回归分析得到方程中变形激活能及其他材料变形参数,并对试验在高温条件下的流变应力本构方程并对其进行了验证。结果表明,采用该本构方程计算出的流变应力值与试验所得应力值非常接近,为估算成形时所需的最大载荷及设备选取提供参考。
In order to investigate the compressive deformation behavior of hot-rolled high strength steel with 900 MPa precipitation hardening type, the Gleeble-3800 thermal simulator was used to study the deformation behavior at 900-1 150 ℃ and 0.1-10 s-1. The peak stress is obtained from the stress-strain curve. The hyperbolic sine equation is used to describe the relationship between the peak stress of the test steel and the Zener-Hollomon parameter during hot compression deformation. Regression analysis of the deformation activation energy and other deformation parameters of the material, and test the rheological stress constitutive equation at high temperature conditions and its validation. The results show that the flow stress calculated by the constitutive equation is very close to the stress value obtained from the experiment, which provides a reference for the estimation of the maximum load required for the forming and equipment selection.