采用恒应变速率凸轮式压缩试验机对8种合金结构钢的流动应力进行了实验研究。其变形温度(T)、应变速率((?))及变形程度(ε％)分别为850—1150℃,5—80s~(-1)及5—69％。分析了变形温度、变形程度及应变速率对流动应力(σ)的影响。通过对变形温度影响项具有两种表达式的流动应力数学模型的非线性回归分析及比较,提出了拟合精度较高的8个合金结构钢流动应力的数学模型,并给出了数学模型的回归系数值。
The flow stress of eight alloy structural steels at high strain rate and high temperature has been studied using a cam plastometry compression machine capable of imparting certain given amount of deformation at a constant strain rate. The tests of the deformation temperature, strain rate and amount of deformation ranged between 850—1150℃, 5—80s~(-1) and 5—69% respectively. The effects of them on the flow stress of the steels were examined. The analysis by non-linear regression and comparison between the mathematical models of flow stress with two types of temperature term were conducted. Thus, a mathematical model of flow stress with great confidence of the eight alloy structural steels is proposed, and its regression coefficient is also recommended.
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