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通过在Gleeble-1500热模拟试验机上的模拟加热和冷却实验,研究了在不同温度下珠光体等温转变后,珠光体轨钢的显微组织和力学性能。结果表明:随着等温温度的升高,相同奥氏体化温度下,相变后珠光体组织中珠光体域的尺寸也随之增大,珠光体片间距随相变温度的升高也逐渐增大。实验钢的力学性能测定结果表明,硬度随着相变温度的升高,呈直线下降趋势;室温冲击韧度随等温温度的升高,也呈下降趋势。从珠光体转变机理方面,对上述关系进行了分析,阐明了相变温度对控制珠光体钢轨组织和性能的影响。
The microstructure and mechanical properties of pearlite rail steel after isothermal transformation of pearlite at different temperatures were studied by means of simulated heating and cooling experiments on Gleeble-1500 thermal simulation tester. The results show that with the increase of the isothermal temperature, the size of the pearlite in the pearlite increases with the increase of the isothermal austenitizing temperature, and the spacing of the pearlite gradually increases with the increase of the transformation temperature Increase. The experimental results of mechanical properties of the experimental steel show that the hardness decreases linearly with the increase of the phase transition temperature. The impact toughness at room temperature decreases with the increase of isothermal temperature. From the pearlite transformation mechanism, the above relationship was analyzed to clarify the effect of phase transition temperature on the control of the microstructure and properties of the pearlite rail.