张琦,李烈军,陈松军,彭政务,高吉祥

• 1:华南理工大学国家金属材料近净成形工程技术研究中心
• 2:广东技术师范大学

摘要(Abstract)：

在Gleeble-3800热模拟机上采用单道次压缩试验研究了SAE8620RH齿轮钢在变形温度为850～1100℃、应变速率为0.02～8 s~(-1)条件下的动态再结晶行为,基于应力-应变曲线计算出Zener-Hollomon参数,采用双曲正弦方程构建本构方程,并利用加工硬化率的方法处理流变应力数据。结果表明:SAE8620RH钢的高温变形激活能为295.274 kJ/mol;结合lnθ-ε曲线的拐点及dlnθ/dε-ε曲线的最小值判据,确定了SAE8620RH钢热塑性变形中动态再结晶发生的临界条件,并建立临界条件与温度补偿的应变速率因子Z之间的函数关系:ε_c=3.21×10~(-4)Z~(0.23687)。

关键词(KeyWords)： SAE8620RH齿轮钢;加工硬化率;动态再结晶;临界条件;热变形激活能

Abstract:

Keywords:

基金项目(Foundation): 广东省自然科学基金(2017A030313276,2018A030310405);; 韶关市科技计划项目(2018CZ12001)

作者(Author): 张琦,李烈军,陈松军,彭政务,高吉祥

DOI: 10.13289/j.issn.1009-6264.2019-0565

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