Investigation on constitutive model and microstructure evolution of high purity titanium during hot deformation

被引：0

作者：

Li, Liang ^{[1
]}

Peng, Fu-Chang ^{[1
]}

机构：

[1] School of Materials Engineering, Panzhihua University, Panzhihua

来源：

Gongneng Cailiao/Journal of Functional Materials | 2014年 / 45卷

关键词：

Constitutive equation; High purity titanium; Hot deformation; Microstructure; Zener-Hollomon;

D O I：

10.3969/j.issn.1001-9731.2014.Suppl.(2).016

中图分类号：

学科分类号：

摘要：

Isothermal compression tests of high purity titanium were performed on a Gleeble-1500 system in the temperature range between 723 and 873 K at strain rates between 0.001 and 1 s-1. The flow behavior was described by a hyperbolic sine constitutive equation and the microstructures of samples were observed by electron back scattering diffraction (EBSD). The results show that during hot deformation pure titanium experienced from strain hardening to steady state deformation and the corresponding softening mechanism changes from dynamic recovery to dynamic recrystallization; peak stress levels decreased with deformation temperature increasing and strain rate decreasing. High purity titanium was positive strain rate sensitive material. The flow stress σ was represented by the Zener-Hollomon parameter in an exponential equation withparameter A, α and n in expression were 1.84×1024 s-1, 0.013 MPa-1 and 12.66, with activation energy Q of 415.69 kJ/mol. The microstructure of specimens with different Z values show that dynamic recrystallization was responsible for softening of low Z value sample, which dynamic recovery was the main reason for dynamic softening of high Z values sample, dynamic recrystallization occurred in the sample with middle Z value. Z value can be used to justified the dynamic softening mechanism for high purity Ti material. ©, 2014, Journal of Functional Materials. All right reserved.

引用

页码：76 / 80

页数：4

共 17 条

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