Strain Rate Dependence of StressStrain Curves in a TiFeO Alloy
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Abstract
Quantitative expression of stressstrain curve including strain rate dependence in a TiFeO alloy was studied at temperatures between 77 and 293 K. <br>In order to evaluate the strainrateindependent component, in the first place, the authors endeavored to obtain the stressstrain curve as the curve at 0 strain rate through relaxation tests under constant crosshead displacement. The relaxationsaturated stressstrain points made a single curve. The authors named this single curve as "Base Curve". The Base Curve was good fitted to the Swift's equation in the following form: σ<sub>Base</sub>(ε)=<i>A</i>(ε+<i>b</i>)<sup><i>n</i></sup>, where σ<sub>Base</sub>(ε) is the stress on the Base Curve, ε the plastic strain, <i>n</i> the exponent, and <i>A</i> and <i>b</i> are coefficients.<br> The stressstrain curves at the strain rate between 2.8×10<sup>5</sup> and 3.0×10<sup>2</sup> s<sup>1</sup> were parallel to the Base Curve. Namely, the strainratedependent component, σ<sup>*</sup>, was independent of strain at a constant strain rate. The relation between σ<sup>*</sup> and strain rate, γ, was expressed in the following form: σ <sup>*</sup>=<i>B</i>γ<sup><i>m</i></sup>, where <i>B</i> coefficient and <i>m</i> exponent.<br> Finally, the equation, σ=<i>A</i>(ε+<i>b</i>)<sup><i>n</i></sup>+<i>B</i>γ<sup><i>m</i></sup>, is derived for the expression of flow stressplastic strain relation under the deformation at a constant strain rate.
Journal

 Transactions of the Iron and Steel Institute of Japan

Transactions of the Iron and Steel Institute of Japan 37(10), 10161022, 19971015
The Iron and Steel Institute of Japan