新型重载辙叉贝氏体钢的组织与性能

用光学显微镜、扫描电镜、X射线衍射分析仪、冲击试验机和万能试验机等对自行研制的重载辙叉用贝氏体钢进行了组织和力学性能研究。结果表明:该试验钢在正火空冷态下即可得到贝氏体组织,由XRD衍射图谱得出组织为无碳化物贝氏体。材料经正火+300 ℃回火后抗拉强度高达1380 MPa,冲击吸收能量高达63.33 J,具有理想的强韧性配合,硬度高且抗回火稳定性好,低温冲击试验表明材料满足了在低温环境下的使用要求。

Microstructure and properties of bainitic steel for new heavy-duty railway frog

Microstructure and properties of a new-developed bainitic steel for heavy-duty railway frog were analyzed by using optical microscope scanning electron microscope,X-ray diffraction analyzer,impact test machine and universal test machine.The results show that bainite structure can be obtained under normalizing,XRD patterns show that the microstructure is carbide-free bainite.After normalizing followed by tempering at 300 ℃,the tensile strength of the material is up to 1380 MPa, and the imact absorbed energy is up to 63.33 J. The steel has high hardness and good anti-tempering stability, low temperature impact test,which shows that the material meets the technical requirements in low temperature environment.