GCr15轴承钢压缩塑性流动研究

Study on Compressed Plastic Yielding Flow of GCr15 Bearing Steel

用多试样法测得GCr15钢退火状态的压缩应力-应变曲线,并研究了此材料的应力与应变的函数关系。结果表明:压缩塑性流动阶段材料明显强化,压缩屈服极限达400MPa,而对数应变50％时其真实应力已超过800MPa。应力-应变的数学表达式为S=960∈^(0.21)。还从变形力学及材料科学角度论述了端面摩擦与应变强化的种种效应。

In this paper,the compressing stress-strain curve is measured for the annealed GCr15 bearing steel by using the multiple-sample method. The functional relationship between the stress and strain in the material is investigated. The test results show that there is a obvious strain hardening phenomenon in the compressing plastic yielding flow with 400 MPa for compressing yielding stress and over 800MPa for true stress at 50% logarithmic strain. A strain hardening exponential relation,S = 960∈0.21, is derived for the same material. The authors has also discussed various effects of the interfacial friction between tools and specimens and the strain hardening of the tested material in virtue of plastic deformation mechanics and material science.