Transactions of Materials and Heat Treatment

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

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ClassificationCode：TG376.3

year,vol(issue):pagenumber：2021,46(1):154-163

Abstract：

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.

Funds：

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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