高锰钢热物理性质的热分析

Measurement of Thermophysical Properties of High Manganese Steel

铸造高锰钢是一种在冶金、矿山、建材行业广泛使用的抗磨材料。采用数值模拟技术进行高锰钢的铸造和热处理工艺分析有利于提高生产效率降低生产成本,但模拟所需的热物理性能是材料数据中空白点。本研究采用综合热分析方法,测量了三种最常用的铸造高锰钢的热物理系数(热膨胀系数,热扩散系数,比热容和导热系数)。实验结果表明:三种材料的热膨胀系数随温度升高而增加,增加锰含量会提高热膨胀系数;ZGMn18的热膨胀系数在三种材料中最大,材料的热容的绝对值在500℃前与温度成正比,500℃后与温度成反比,锰含量越高,热容的绝对值越大;材料的热扩散系数随温度升高而增大,且锰含量增加,热扩散系数增大;材料的导热系数随温度升高而增大,锰含量越高,导热系数越大。

Cast high manganese steel is a kind of wear-resistant material widely used in metallurgy, mining and building materials industry. Using numerical simulation technology to analyze the casting and heat treatment process of high manganese steel is beneficial to improve production efficiency and reduce production cost, but the thermophysical properties needed for simulation are blank points in material data. In this study, the thermophysical coefficients (thermal expansion coefficient, ther-mal diffusion coefficient, specific heat capacity and thermal conductivity coefficient) of the three most commonly used cast high manganese steels were measured by comprehensive thermal anal-ysis method. The experimental results show that the thermal expansion coefficient of the three materials increases with the increase of temperature, and the thermal expansion coefficient will increase with the increase of manganese content. The thermal expansion coefficient of ZGMn18 is the largest among the three materials. The absolute value of heat capacity of the material is pro-portional to temperature before 500˚C and inversely proportional to temperature after 500˚C. The higher the manganese content, the greater the absolute value of heat capacity. The thermal diffu-sion coefficient of the material increases with the increase of temperature, and the thermal diffu-sion coefficient increases with the increase of manganese content. The thermal conductivity of the material increases with the increase of temperature, and the higher the manganese content, the greater the thermal conductivity.