高速列车制动盘用Cr-Mo-V钢的导热特性

采用激光脉冲试验法研究不同淬火和回火工艺对高速列车制动盘用Cr-Mo-V钢在50～800℃时的比热容、热扩散系数和导热系数。结果表明,当试验温度低于700℃时,随着试验温度的提高,试验料热扩散系数和导热系数逐渐降低,比热容逐渐提高;当试验温度超过700℃时,试验料热扩散系数和导热系数又随之提高,比热容随之下降。当试验温度低于700℃时,随着回火温度或淬火温度的提高,试验料在不同试验温度条件下热扩散系数和导热系数均稍有提高,比热容稍有降低;当试验温度为800℃时,几组试验料的比热容、热扩散系数和导热系数基本相当。 

Thermal conductive characteristics of Cr-Mo-V steel for high-speed train brake disc

The specific heat capacity,thermal diffusion coefficient and thermal conductivity of Cr-Mo-V steel for high-speed train brake disc under different quench and tempering temperatures were studied by laser pulse experiment at 500-800 ℃. Test results show that when the temperature is below 700 ℃,with the increase of experimental temperature,the thermal diffusion coefficient and thermal conductivity decrease while the specific heat increases gradually;when the temperature is 800 ℃,the thermal diffusion coefficient and thermal conductivity coefficient of the test material increase. When the temperature is lower than 700 ℃,with the increase of quenching temperature or tempering temperature,the thermal diffusivity and thermal conductivity of the test material increase slightly in different experimental temperatures,and the specific heat capacity decreases slightly. When the temperature is 800 ℃,the specific heat capacity,thermal diffusion coefficient and thermal conductivity of several groups of test materials are basically the same.