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研究了通过等径通道挤压技术加工后的诱导孪晶塑性变形钢(TWIP钢)的力学性能,并且通过Ludwik,Hollomon以及Swift三种本构模型对拉伸真实应力应变曲线进行了拟合。实验结果表明:随着挤压道次的增加,屈服强度以及极限抗拉强度不断升高,而塑性,抗拉韧性不断下降。Ludwik,Hollomon以及Swift三种本构模型对于真实应力应变曲线的拟合程度较好,并且本文给出了各模型中的拟合参数。拟合参数中,本文着重讨论了应变硬化系数n随着挤压道次的升高而降低的原因。
The mechanical properties of TWIP steels induced by isobaric channel extrusion were studied. The true tensile stress-strain curves were fitted by Ludwik, Hollomon and Swift constitutive models. The experimental results show that with the increase of extrusion pass, the yield strength and the ultimate tensile strength increase continuously, while the ductility and tensile toughness decrease continuously. Ludwik, Hollomon and Swift three constitutive models for the true stress-strain curve fitting better, and this article gives the fitting parameters in each model. In the fitting parameters, this paper focuses on the reason why the strain hardening coefficient n decreases with the increase of extrusion pass.