Abstract: Tested EA4T axle steel (/% : 0. 26C, 0. 35Si, 0. 75Mn, 0. 01 IP, 0. 012S, 1. 04Cr, 0. 22Mo) is melted by a 10 kg vacuum induction furnace. The single pass reduction test on tested EA4T axle steel is carried out by using Gleeble-1500 thermal simulation machine to study the effect of temperature (950 ~ 1 150℃) , strain (0 ~0. 8) and strain rate (0. 1 - 20 s^-1) on deformation resistance of this steel, and the a math model for hot deformation resistance of the steel is established. Results show that the dynamic recrystallization of the steel easily occurs at higher temperature and lower strain rate, its peak stress (σ_P), peak strain ( ε_P) and steady strain (σ_s) of test steel are all in linear relationship with parameter InZ； the peak and steady activation energy of test steel is respectively 320. 22 kJ/mol and 361. 91 kJ/mol ； and the deformation resistance calculated by predicted model is in good agreement with measured result.

摘要： 试验用EA4T车轴钢(/%:0.26C、0.35Si、0.75Mn、0.011P、0.012S、1.04Cr、0.22Mo)由10 kg真空感应炉熔炼。用Gleeble-1500热模拟试验机对EA4T车轴钢进行高温单道次压缩试验以研究温度(950～1150℃)、应变量(0～0.8)和应变速率(0.1～20 s^-1)对该钢变形抗力的影响,并建立该钢热变形抗力的数学模型。结果表明,钢种在较高温度和较低应变速率下动态再结晶容易发生,峰值应力(σ_P)、峰值应变(ε_P)和稳态应力(σ_s)与参数lnZ成线性关系;实验钢的峰值与稳态激活能分别为320.22 kJ/mol和361.91 kJ/mol;变形抗力的预测模型与实验所得结果吻合良好。

关键词: EA4T车轴钢, 应力, 应变, 激活能, 数学模型