城际及高铁轨道用辙叉贝氏体钢的组织与性能

采用光学显微镜、扫描电镜、X射线衍射仪、冲击试验机以及万能试验机研究了城际及高铁轨道辙叉用贝氏体钢的组织与力学性能。结果表明,试验钢在空冷条件下即可得到贝氏体组织,经XRD分析其组织为无碳化物贝氏体。试验钢的抗拉强度达到1410 MPa,室温冲击吸收能量高达89 J,硬度较高且具有较好的强韧性配比。低温冲击试验结果表明,试验钢可以满足低温环境下城际及高铁轨道辙叉的使用要求。

Microstructure and properties of bainitic steel for frog used in intercity and high-speed railway track

Microstructure and mechanical properties of bainitic steel for intercity and high-speed railway frog were studied by means of optical microscope, scanning electron microscope, XRD, impact tester and universal tester. The results show that the bainite structure of the tested steel can be obtained under air cooling condition, and the structure is carbide free bainite determined by XRD analysis. The tensile strength of the tested steel is 1410 MPa, and the impact absorbed energy at room temperature is up to 89 J. The steel has a higher hardness, and good match of strength and toughness. The low-temperature impact test results show that the tested steel can meet the application requirements of the frog for intercity and high-speed railway track under low-temperature environment.