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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900~1 150℃温度区间和0.1~10s-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364.9kJ/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。
Single-pass compression tests were carried out on a Gleeble 3800 thermal simulator to study the dynamic behavior of 37MnSiVS for a new type of high-vanadium-forged continuous link under 900 ~ 1 150 ℃ and 0.1 ~ 10s-2 deformation rate Recrystallization behavior. The results show that the thermal deformation characteristics of the test materials are basically the same as those of the conventional medium carbon microalloyed steels. The higher temperature and the lower strain rate are conducive to the dynamic recrystallization. The time to start the recrystallization of the test material at the deformation temperature below 1 000 ° C is further prolonged. Transmission electron microscopy (TEM) observations show that the vanadium in the test material is mainly in the form of solid solution in the austenite, which affects the dynamic recrystallization behavior of austenite. The thermal deformation activation energy of the obtained test material is 364.9 kJ / mol, and the relationship between the thermal deformation equation and the dynamic recrystallization grain size and the Zener-Hollomon parameter is obtained.