Transactions of Materials and Heat Treatment

Title：Investigation on constitutive relationship of 300M high strength steel during hot deformation

Authors： Du Jingxia Li Hongbo Zhang Yanshu Mo Anjun

Unit： Yanshan University Advanced Manufacture Technology Center China Academy of Machinery Science & Technology China National Erzhong Group Co.

KeyWords： 300M high strength steel hot compression deformation constitutive equation error analysis

ClassificationCode：TG142.41

year,vol(issue):pagenumber：2014,39(8):109-114

Abstract：

Hot compression deformation tests whose height reduction is 60% were conducted on 300M high strength steel by using a Gleeble-3500 thermal simulator with deformation temperatures ranging from 850 ℃ to 1180 ℃ and strain rates ranging from 0.001 s-1 to 20 s-1. Investigation was conducted on deformation behavior of 300M steel under different deformation conditions. The results show that the deformation behavior of 300M steel is closely related to the deformation parameters. The dynamic recrystallization occurs more easily if the deformation temperature is higher and the strain rate is lower. The constitutive relationships between Q, A, n,α in hyperbolic sine equations of Arrhenius-type and true strain were established based on experimental data, so the constitutive equation of 300M high strength steel at high temperature including deformation temperature, strain rate and strain was further established. In order to evaluate the accuracy of constitutive equation, comparison and mean error analysis of flow stress between the experimental data and calculated results were conducted. The worst case is the error of 14.2%, but the errors are below 10% on the whole. The analysis shows that the flow stress values calculated by the established constitutive equation are coincident with experimental data well.

Funds：

国家科技重大专项“高档数控机床与基础制造装备”（2012ZX04010-081）

杜敬霞（1989-），女，硕士研究生；张艳姝（1976-），女，博士，高级工程师

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