Hot deformation behaviors and flow stress model of GCr15 bearing steel

来源期刊:中南大学学报(英文版)2008年第5期

论文作者:廖舒纶 张立文 岳重祥 裴继斌 高惠菊

文章页码:575 - 575

Key words:GCr15 bearing steel; flow stress; dynamic recystallization; hot deformation

Abstract: The hot deformation behaviors of GCr15 bearing steel were investigated by isothermal compression tests, performed on a Gleeble-3800 thermal-mechanical simulator at temperatures between 950 ℃ and 1 150 ℃ and strain rates between 0.1 and 10 s-1. The peak stress and peak strain as functions of processing parameters were obtained. The dependence of peak stress on strain rate and temperature obeys a hyperbolic sine equation with a Zener-Hollomon parameter. By regression analysis, in the temperature range of 950-1 150 ℃ and strain rate range of 0.1-10 s-1, the mean activation energy and the stress exponent were determined to be 351kJ/mol and 4.728, respectively. Meanwhile, models of flow stress and dynamic recrystallization (DRX) grain size were also established. The model predictions show good agreement with experimental results.

基金信息:the Youth Science and Technology Elitist Foundation of Dalian, China

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