ABSTRACT

The solidification modes of high manganese steels were measured by experiments and comparatively calculated by different predicted methods. The DSC experiments indicate the same phase transformation sequence as the isothermal solidification experiments. It is demonstrated that the solidification modes of the Fe–0.028C–21.1Mn–5.72Al, Fe–0.28C–21.0Mn–5.80Al and Fe–0.64C–21.0Mn–5.80Al alloys are F mode, FA1 mode and FA2 mode. The change of heating/cooling rate influences the position and shape of the peaks in the DSC curves but has no effect on the solidification mode. By comparison with different calculation methods, the equilibrium model is shown to be a valuable tool to predict the solidification sequence of the high-Mn steel, from which the critical carbon range for the Fe–C–20Mn–5Al alloy is calculated to be 0.062∼0.427 wt-%.

摘要

通过实验测量高锰钢的凝固模式，并通过不同的预测方法进行比较计算。DSC实验表明与等温凝固实验相同的相变序列。结果表明，Fe–0.028C–21.1Mn–5.72Al，Fe–0.28C–21.0Mn–5.80Al和Fe–0.64C–21.0Mn–5.80Al合金的凝固模式为F模式，FA1模式和FA2模式。加热/冷却速率的变化会影响DSC曲线中峰的位置和形状，但不会影响凝固模式。通过与不同的计算方法进行比较，表明平衡模型是预测高锰钢凝固序列的有价值的工具，由此可以计算出Fe–C–20Mn–5Al合金的临界碳范围为0.062 〜0.427重量％。