ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2020, Vol. 41 ›› Issue (5): 48-51.

• 组织和性能 • 上一篇    下一篇

1200 MPa新型Nb-V微合金化贝氏体钢轨钢的组织转变及性能

杨维宇,张凤明,李智丽,何建中   

  1. 包钢钢联股份有限公司技术中心,包头014010
  • 收稿日期:2020-04-28 出版日期:2020-10-01 发布日期:2022-05-06
  • 作者简介:杨维宇(1982-),男,硕士(2009年中北大学),高级工程师, 2006年中北大学(本科)毕业,新产品开发和失效分析。 何建中(1965-),男,博士,正高级工程师,从事产品开发。
  • 基金资助:
    国家重点研发计划资助(2017 YFB0304504) 

Microstructure Transformation and Properties of a 1200 MPa New Type Nb-V Micro-Alloying Bainite Rail Steel

Yang Weiyu, Zhang Fengming, Li Zhili , He Jianzhong   

  1. Technical Outer of Steel Union Co Ltd, Baotou Steel (Group) Corp, Baotou 014010
  • Received:2020-04-28 Published:2020-10-01 Online:2022-05-06

摘要: 利用膨胀仪并结合金相法和硬度法,测定了新型Nb-V微合金化贝氏体钢轨钢20mm板(/%:0.24C,0.39Si,1.86Mn,0.007S,0.002P,1.36Cr,0.33 Mo,0.04Nb,0.11V)的连续冷却转变(CCT)曲线,研究冷却速度0.04~4.0℃/s对钢的显微组织及硬度的影响。结果表明,试验钢Bs点温度低于400℃,当冷却速度在0.1~0.8℃/s,试验钢可获得全贝氏体组织,符合贝氏体钢轨的合金设计原理;试验钢的轧态显微组织以板条贝氏体为主,还有少量的马氏体,其强度、塑性、韧性、硬度各指标匹配较好,满足现行贝氏体钢轨相关技术条件的要求。

关键词: Nb-V微合金化贝氏体钢 , 钢轨, 静态CCT曲线 , 显微组织 , 力学性能

Abstract: Using expansion instrument combined with metallographic analysis and hardness measurement, a continuous cooling transformation (CCT) curves of new Nb-V microalloyed bainite rail steel 20 mm plate (/% :0. 24C,0. 39Si, 1. 86Mn,0. 007S,0. 002P, 1 • 36Cr,0. 33Mo,0. 04Nb,0. 11V) are determined, the effect of cooling rate 0. 04 〜4. 0 °C/a on microstructure and hardness of steel are studied. The results show that the Bs point of tests steel is lower than 400 °C , when the cooling rate is in the range of 0. 1 to 0. 8 Y/s, the whole bainite structure can be obtained, which is consistent with the bainite rail alloy design principle ; the rolled microstructure of test steel is lath bainite and a small amount of martensite. The strength, plasticity, toughness and hardness of the rolled state are well matched, which meets the relevant technical conditions of the current bainitic rail production.

Key words:  , Nl)-V Micro-Alloying Bainite Steel, Rail, Static CCT Curve, Microstructure, Mechanical Properties ,