20Cr2Ni4A钢的动态再结晶行为
Dynamic recrystallization behavior of 20Cr2Ni4A steel
吴晓东 1周少荣 1张肖佩佩 1王忠英2
作者信息
- 1. 江苏大学材料科学与工程学院,江苏镇江 212013
- 2. 钢铁研究总院华东分院,江苏淮安 223000
- 折叠
摘要
利用Gleeble-3500热模拟试验机对20Cr2Ni4A渗碳齿轮用钢进行应变量为0.8、变形温度为800～1050 ℃、应变速率为0.01～5 s-1下的单道次等温压缩试验,研究其在试验条件下的动态再结晶行为.根据试验结果绘制流变应力曲线.结果表明:流变应力曲线根据不同变形条件下加工硬化、动态回复和动态再结晶三者的进行程度可分为动态回复型和动态再结晶型,在低应变速率下(0.01～0.1 s-1),950～1050℃发生较明显的动态再结晶;利用加工硬化率确定了动态再结晶临界应变εc和峰值应变εp,构建了εc与εp的关系模型;根据试验数据建立动态再结晶动力学模型,并结合显微组织分析说明该模型具有一定可靠性.
Abstract
Dynamic recrystallization behavior of 20Cr2Ni4A carburized steel for gears was studied by means of single isothermal compression test with deformation temperature of 800-1050 ℃ and strain rate of 0.01-5 s-1 at the strain variable of 0.8 on Gleeble-3500 thermal simulation machine.According to the experimental results,the flow stress curve was drawn.The results show that the flow stress curve can be divided into dynamic recovery type and dynamic recrystallization type according to the degree of work hardening,dynamic recovery and dynamic recrystallization under different deformation conditions.At low strain rate(0.01-0.1 s-1),the dynamic recrystallization occurs more obviously at 950-1050 ℃.The critical strain εc and peak strain εp of dynamic recrystallization are determined by the work hardening rate,and the relationship model between εc and εp is established.Based on the experimental data,a dynamic model of dynamic recrystallization is established,and the analysis of microstructure shows that the model is reliable.
关键词
20Cr2Ni4A钢/热变形/临界应变/动态再结晶/体积分数Key words
20Cr2Ni4A steel/thermal deformation/critical strain/dynamic recrystallization/volume fraction引用本文复制引用
基金项目
国家重点研发计划(2020YFB2008100)
出版年
2024
NETL
NSTL
万方数据