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- W2362207708 abstract "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 × 1024s-1,0. 013 MPa-1and 12. 66,with activation energy Q of 415. 69 k J/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." @default.
- W2362207708 created "2016-06-24" @default.
- W2362207708 creator A5000323703 @default.
- W2362207708 date "2014-01-01" @default.
- W2362207708 modified "2023-09-23" @default.
- W2362207708 title "Investigation on constitutive model and microstructure evolution of high purity titanium during hot deformation" @default.
- W2362207708 hasPublicationYear "2014" @default.
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