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采用膨胀法,辅以金相法、硬度法测定了2种成分试验贝氏体钢轨钢的连续冷却转变曲线,对不同冷速下获得的金相组织进行观测,同时分析讨论了成分的选择及合金元素的作用。试验表明,1号钢冷却速度在0.3～2℃/s范围内,2号钢冷却速度在0.3～3℃/s范围内,贝氏体钢中得到以贝氏体为主的组织;1号钢、2号钢最佳冷速范围均为0.8～1.5℃/s;当冷速大于4℃/s时,两组钢将得到以板条马氏体为主的组织。
The continuous cooling transformation curves of two kinds of component test bainitic rail steel were determined by the method of expansion, supplemented by the metallographic method and the hardness method. The microstructure of the bainitic rail steel was observed under different cooling rates. The composition selection and alloy elements Role. The results show that the cooling rate of No.1 steel is in the range of 0.3 ~ 2 ℃ / s, the cooling speed of No. 2 steel is in the range of 0.3 ~ 3 ℃ / s, and bainite is the main structure in bainitic steel. The optimum cooling rates of steel and steel are both 0.8 ~ 1.5 ℃ / s. When the cooling rate is more than 4 ℃ / s, the two groups of steel will get the lath martensite.