金属热处理 ›› 2021, Vol. 46 ›› Issue (2): 45-49.DOI: 10.13251/j.issn.0254-6051.2021.02.008

• 组织与性能 • 上一篇    下一篇

过共析钢轨钢的连续冷却转变行为

王东梅1, 赵磊城2, 陈林1, 董瑞1   

  1. 1.内蒙古科技大学 材料与冶金学院, 内蒙古 包头 014010;
    2.内蒙古第一机械集团股份有限公司 第三分公司, 内蒙古 包头 014030
  • 收稿日期:2020-07-24 出版日期:2021-02-25 发布日期:2021-05-08
  • 通讯作者: 陈林,教授,E-mail:chenlin39805@163.com
  • 作者简介:王东梅(1985—),女,讲师,博士,主要研究方向为先进钢铁结构材料组织和性能以及新一代钢轨开发及钢轨组织性能控制,E-mail:wangdm6@126.com。
  • 基金资助:
    内蒙古自治区自然科学基金(2020BS05035);内蒙古科技大学创新基金(2019QDL-B04);内蒙古自治区科技重大专项(ZDZX2018024)

Continuous cooling transformation behavior of hypereutectoid rail steel

Wang Dongmei1, Zhao Leicheng2, Chen Lin1, Dong Rui1   

  1. 1. School of Materials and Metallurgy, Inner Mongolia University of Science & Technology, Baotou Inner Mongolia 014010, China;
    2. The Third Branch of Inner Mongolia First Machinery Group Co., Ltd., Baotou Inner Mongolia 014030, China
  • Received:2020-07-24 Online:2021-02-25 Published:2021-05-08

摘要: 以碳含量(质量分数)大于0.9%的过共析钢轨钢为研究对象,采用L78淬火膨胀仪研究了其在连续冷却过程中的微观组织及力学性能演变规律,并建立了过共析钢轨钢的连续冷却曲线,为制定过共析钢轨钢的合理轧后冷却工艺提供了理论依据。结果表明:当冷却速度在5~10 ℃/s内时,能够有效减少渗碳体与马氏体等异常组织的产生以及细化珠光体的片层间距,从而提高过共析钢轨钢的力学性能。

关键词: 过共析钢轨钢, 连续冷却转变, 珠光体, 细化

Abstract: Microstructure evolution and mechanical properties of the hypereutectoid rail steel with carbon content(mass fraction) above 0.9% were investigated by means of L78 quenching dilatometer during the continuous cooling process. The continuous cooling transformation curves were determined to providing a theoretical basis for the proper post-rolling controlled cooling process. The results show that at the cooling rate from 5 ℃/s to 10 ℃/s, the cementite precipitation and martensite formation are effectively prohibited, the interlamellar spacing of pearlite is refined, and the mechanical properties of the hypereutectoid rail steel are improved.

Key words: hypereutectoid rail steel, continuous cooling transformation, pearlite, refinement

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