20CrMo连铸坯高温力学性能和热物理性能分析

采用Greeble-1500D热模拟机和STA449综合热分析仪研究20CrMo钢连铸坯的高温延塑性和部分热物性能，获得可靠的基础数据；找出了该钢种的最佳塑性区温度范围，在600—775℃范围内，断面收缩率仅为30％，而在800—1250℃范围内断面收缩率均为80％以上。在1350℃至熔点塑性又迅速下降到60％以下；首次绘制了该钢种的热容随温度变化的关系曲线，分段回归出了比热cp随温度变化的计算公式；绘制出热膨胀系数随温度变化的关系曲线；并对研究结果在连铸生产中的应用进行了分析讨论．

Mechanical Performance and Thermology Performance of 20CrMo Steel at High Temperature

Employing the Gleeble-1500D thermal analogue machine and the STA449 synthesis thermal analyzer,the study on hot ductility and parts of thermology performance of 20CrMo steel has been carried out , many consulted foundation data has been obtained, the optimum ductility temperature arrange has been found, contraction of cross sectional area is only 30% between 600 degree and 775 degree, but contraction of cross sectional area is more than 80% between 800 degree and 1 250 degree, contraction of cross sectional area drops to under 60% rapidly between 1 350 degree and melting point,a curve is drawn showing the relationshi Pbetween heat capacity and the variation of temperature for the first time, the counting formulas of the heat capacity are regressed by disjunction. A curve is drawn showing the relationshi Pbetween the coefficient of thermal expansion and the variation of temperature, and their application in continuous casting is discussed herein.