GCr15轴承钢的动态再结晶行为及变形抗力模型  

Dynamic recrystallization behavior and deformation resistance model of GCr15 bearing steel

作　　者：黄志远 杜林秀[1] 董营 伏思宇 陆佳宁 HUANG Zhiyuan;DU Linxiu;DONG Ying;FU Siyu;LU Jianing(State Key Laboratoryof Rolling and Automation,Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《钢铁研究学报》2022年第12期1439-1446,共8页Journal of Iron and Steel Research

基　　金：国家高新技术研究发展计划(863计划)资助项目(2015AA03A501)。

摘　　要：为优化后续热轧工艺,研究GCr15轴承钢在热变形过程中的动态再结晶行为和变形抗力模型。利用热模拟试验机对实验钢进行了单道次等温恒应变速率压缩实验,实验温度范围为750~1 050℃,应变速率范围为0.01~10 s-1,真应变为0.7。得到实验钢的真应力-应变曲线,并对其动态再结晶行为进行详细的分析,发现低应变温度的应力-应变曲线的下降现象是在动态再结晶行为与形变诱导型相变行为的共同作用下实现的。结合数据,建立了GCr15轴承钢的本构方程以及变形抗力模型。GCr15轴承钢应变激活能Q为322.1 kJ/mol,应力指数n为5.392 2。本构方程与变形抗力模型的拟合度分别达到0.98与0.95。In order to optimize the subsequent hot rolling process, the dynamic recrystallization behavior and deformation resistance model of GCr15 bearing steel during hot deformation were studied. A single pass isothermal constant strain rate compression test was carried out on the test steel using a thermal simulation machine. The test temperature range was 750-1 050 ℃, the strain rate range was 0.01-10 s-1, and the true strain was 0.7. The true stress-strain curve of the experimental steel was obtained, and the dynamic recrystallization behavior of the experimental steel was analyzed in detail. It is found that the decrease of the stress-strain curve at low strain temperature is realized under the joint action of dynamic recrystallization behavior and deformation induced phase transformation behavior. Combined with the data, the constitutive equation and deformation resistance model of GCr15 bearing steel are established. The recrystallization activation energy Q of GCr15 bearing steel is 322.1 kJ/mol, and the stress index n is 5.392 2. The fitting degree of constitutive equation and deformation resistance model is 0.98 and 0.95, respectively.

关 键 词：轴承钢 相变 应力-应变曲线 动态再结晶 变形抗力 

分 类 号：TG142.45[一般工业技术—材料科学与工程]