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