316LN钢ESR材料热变形行为及高温塑性本构方程

为了研究铸态316LN钢ESR材料的高温变形行为,建立铸态316LN钢ESR材料高温塑性本构方程,采用Gleeble-1500D热模拟试验机对316LN钢进行等温压缩试验,研究了316LN钢ESR材料在变形温度为900~1200℃、应变速率为0.001~1 s~(-1)、最大变形量为55%条件下热变形行为,并测得相应的流动应力-应变曲线。结果表明,在高变形温度、低应变速率的条件下,更有利于动态再结晶的发生。通过对试验数据进行多元线性拟合计算,得到了316LN钢的热变形激活能,建立了316LN钢ESR材料的高温塑性本构方程。

Thermal deformation behavior and high temperature plastic constitutive equation of ESR steel 316 LN

In order to study the deformation behavior and establish the plastic constitutive equation at high temperature of as-cast ESR steel 316LN, the isothermal compression test of steel 316LN was conducted by Gleeble -1500D thermal simulation testing machine. Then, the thermal deformation behavior of ESR steel 316LN at deformation temperatures of 900-1200 ℃, strain rates of 0. 001-1 s-1 and the maximum deformation of 55% was studied, and the corresponding flow stress and strain curves were investigated. The results show that under the conditions of high deformation temperature and low strain rate, the dynamic recrystallization is more conducive to occur. By the multiple linear regression calculation on experimental data, the hot deformation activation energy is obtained and the high temperature plastic constitutive equation of ESR steel 316LN is established.