在应变速率0.01~10 s-1、变形温度950~1 200 ℃条件下, 采用Gleeble-3500型热/力模拟试验机对一种支承辊用高铬钢进行了热压缩变形试验, 研究了其热变形行为和再结晶规律, 基于动态材料模型绘制热加工图。结果表明: 此钢的热变形激活能为481.363 kJ·mol-1, 热变形方程=1.0×1018[sinh(0.008 3σ)]5.78exp[-481 363/(RT)]; 温度和应变速率分别为1 045~1 170 ℃, 0.01~0.3 s-1及1 165~1 200 ℃, 1~10 s-1的变形条件属于最佳工艺参数范围, 此时的变形机制为动态再结晶, 能量消耗效率可达29%以上。

The thermal deformation mechanical behavior and recrystallization law of a high-chromium bearing roller steel were studied in a hot compression test in which the strain rates were 0.01-10 s-1 and the deformation temperatures were 950-1 200 ℃, using Gleeble-3500 thermal/power simulation test machine. The thermal processing map was drawn based on dynamic materials model. The results show that the thermal deformation equation could be described as =1.0×1018[sinh(0.008 3σ)]5.78exp[-481 363/(RT)], and the thermal deformation activation energy was 481.363 kJ·mol-1. The best deformation conditions of combination of temperature and stain rate were 1 045-1 170 ℃, 0.01-0.3 s-1 and 1 165-1 200 ℃, 1-10 s-1. The deformation mechanism was dynamic recrystallization, and the energy dissipation rate was more than 29%.