一种支承辊用高铬钢的热变形行为及其热加工图

Hot Deformation Behavior and Thermal Processing Map of a High-Chromium Bearing Roller Steel

在应变速率0．01～10s^-1、变形温度950-1200℃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481．363kJ·mol^-1，热变形方程ε=1．0×10^18[sinh（0．0083σ）]^5.78exp[-481363／（RT）]；温度和应变速率分别为1045～1170℃，0．01～0．3s^-1及1165～1200℃，1～10s^-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 C, 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 1.0×10^18[sinh（0.0083σ）]^5.78exp[-481363/（RT）], and the thermal deformation activation energy was 481. 363 kJ · mol^-1. The best deformation conditions of combination of temperature and stain rate were1045-1170 ℃, 0. 01 0.3s^-1 and l165--1200 C, 1--10s ^-1. The deformation mechani＇sm was dynamic recrystallization, and the energy dissipation rate was more than 29%.