利用Gleeble 3800热模拟试验机进行单道次压缩试验,研究了1种新型胀断连杆用高钒中碳钢37MnSiVS在900～1150℃温度区间和0.1～10 s-2变形速率条件下的动态再结晶行为.结果表明:试验料的热变形特征与传统的中碳微合金钢基本一致,较高的温度和较低的应变速率有利于发生动态再结晶.试验料在变形温度低于1 000℃时开始发生再结晶的时间进一步延长.透射电镜(TEM)观察结果表明,试验料中的钒主要以固溶态的形式存在于奥氏体中,从而影响奥氏体的动态再结晶行为.所获得的试验料的热变形激活能为364.9 kJ/mol,并得出了其热变形方程及动态再结晶晶粒尺寸与Zener-Hollomon参数之间的关系式.
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