锻压技术

S390粉末高速钢高温变形流动应力行为与预测

英文标题：Flow stress behavior and prediction of S390 powder metallurgy high speed steel at high temperature deformation

关键词：S390粉末高速钢流动应力本构方程热变形行为 Zener-Hollomon参数

分类号：TG376.3

出版年,卷(期):页码：2021,46(1):154-163

摘要：

在变形温度为950~1200 ℃、应变速率为0.002~1 s-1和变形程度为50%的条件下，采用Gleeble-1500D热模拟机进行S390粉末高速钢等温压缩实验，研究其热变形行为。S390粉末高速钢的流动应力随着变形温度的降低和应变速率的升高而显著增大，可通过Zener-Hollomon参数综合反映。通过实验测定的数据，建立了基于双曲正弦Arrhenius方程的综合性本构模型。考虑变形程度对S390粉末高速钢变形行为的影响，材料常数如α、n、lnA、Q等均为应变的函数。所建立本构方程的流动应力预测值与实验值吻合较好，平均相对误差为5.055%，表明该本构方程用于分析S390粉末高速钢的热变形行为是可靠的。

Isothermal compression tests of S390 powder metallurgy high speed steel (S390 PMHSS) were carried out to investigate its hot deformation behavior on a Gleeble-1500D thermal simulator under the temperatures varying from 950 to 1200 ℃, the strain rates ranging from 0.002 to 1 s-1, and the deformation degree of 50%. The flow stress of S390 PMHSS increased significantly with the decreasing of deformation temperature and the increasing of strain rate, which could be represented by Zener-Hollomon parameter. Comprehensive constitutive model based on the hyperbolic sine Arrhenius equation was developed by the experimentally measured data. Considering the effects of deformation degree on the deformation behavior of S390 PMHSS, the material constants such as α, n, lnA and Q were the functions of the strain. The predicted flow stress values by the developed constitutive equation show a close agreement with the experimental values, and the average absolute relative error is 5.055%, which indicates that the constitutive equation can reliably analyze the hot deformation behavior of S390 PMHSS.

基金项目：

基金项目:国家自然科学基金资助项目（51975240）；先进成形技术与装备国家重点实验室开放基金（SKL2019006)

作者简介：王欣（1981-），男，博士，高级工程师 E-mail：wangxin-11@163.com

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