Abstract: Behaviour of thermal deformation of steel Cr5 (% ：0.85C, 5.0Cr, 0.6Si, 0.5Ni, 0.4Mo, 0.1V) with stain rate 0.001 〜1 s-1 at 900 ~ 1200 °C has been studied by using Gleeble-3500 thermal simulator. The apparent activation energy Q for steel Cr5 is 307 kJ/mol. The thermal deformation equation for steel Cr5 is given to characterize the dependence of peak stress of thermal deformation on temperature and strain, and its processing map is established. With increasing deformation temperature and decreasing strain rate, the efficiency η of power dissipation increases, and with true strain 0. 7 and strain rate 0.001 sat 1100 °C the efficiency of power dissipation is up to peak value that is about 40%.

Key words: Steel Cr5 for Cold Working Roll, Thermal Deformation Equation, Processing Map

摘要： 采用Gleeble-3500热模拟试验机,研究了Cr5钢(%:0.85C、5.0Cr、0.6Si、0.5Ni、0.4Mo、0.1V)在应变速率0.001～1 s^-1、变形温度900～1 200℃条件下的热变形行为。Cr5钢的热变形激活能Q为307 kJ/mol,确定了表征热变形峰值应力与温度和应变关系的Cr5钢的热变形方程,建立了其热加工图(Processing Map);随着变形温度的升高及应变速率的降低,能量消耗效率η逐渐升高;真应变为0.7,变形温度为1 100℃、应变速率为0.001 s^-1时,能量消耗效率达到峰值,约为40%。

关键词: Cr5型冷轧工作辊用钢, 热变形方程, 热加工图