金属热处理 ›› 2020, Vol. 45 ›› Issue (4): 90-93.DOI: 10.13251/j.issn.0254-6051.2020.04.018

• 组织与性能 • 上一篇    下一篇

新型重载辙叉贝氏体钢的组织与性能

王楠, 胡志华, 王正云, 汪思敏, 陈杰, 栾道成   

  1. 西华大学 材料科学与工程学院, 四川 成都 610039
  • 收稿日期:2019-10-01 出版日期:2020-04-25 发布日期:2020-05-08
  • 通讯作者: 胡志华,副教授,硕士, E-mail:1443963462@qq.com
  • 作者简介:王 楠(1995—),男,硕士研究生,主要从事贝氏体钢,E-mail:294227337@qq.com
  • 基金资助:
    四川省科技厅支撑项目(2018GZ0053,2017GZ0073);四川省经信委技术创新项目(16201404);四川省高校重点实验室开放基金(szjj2016-055);西华大学创新基金(Ycjj2018070)

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

Wang Nan, Hu Zhihua, Wang Zhengyun, Wang Simin, Chen Jie, Luan Daocheng   

  1. School of Materials Science and Engineering, Xihua University, Chengdu Sichuan 610039, China
  • Received:2019-10-01 Online:2020-04-25 Published:2020-05-08

摘要: 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。

关键词: 重载辙叉, 贝氏体钢, 正火, 强韧性, 硬度

Abstract: 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.

Key words: heavy-load railway frog, bainitic steel, normalizeing, strength and toughness, hardness

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