H13钢热变形行为的数学模型

来源期刊：钢铁2010年第5期

论文作者：冯迪 林高用 刘健 邹艳明 彭大暑

文章页码：52 - 56

关键词：H13钢； 弹性模量； 热压缩； 流变应力； 数学模型

Key words：H13 steel； elastic modulus； thermal compression； flow stress； mathematical model

摘    要：为建立H13钢制模具失效分析的有限元模型,利用Instron8032对该材料在20~650℃范围内的弹性模量进行了测量,利用Gleeble1500对其在650~800℃温度范围,0.1~20 s^-1应变速率下的热压缩变形行为进行了研究。结果表明:弹性模量随温度的升高先下降再上升,在350℃时再次下降;流变应力随变形温度的升高而降低,随应变速率的提高而增大。结合广义Hooke定理和利用Zener-Hollomon参数描述的双曲正弦函数,建立了H13钢的热变形行为的数学模型。

Abstract: In order to actualize the finite element analysis for the failure of the die which is made of H13 steel,the Tensile tests were implemented on Instron8032 to get the elastic modulus between the temperature from 20 to 650℃,and the thermal compression behaviors of H13 steel from 650℃ to 800℃and strain rates from 0.1s^-1 to 20 s^-1 were investigated through Gleeble 1500 simulator.Results show that the elastic modulus decreases at first and then increases,but decreases again when the temperature is higher than 350℃,and the flow stress decreases with the increase of temperature,while rises with the strain rate increases.Combining the generalized Hooke’s Law and the hyperbolic sine function which is described by Zener-Hollomon parameter,a mathematical model describing the thermal behaviors of H13 steel was established.