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

杨维宇; 张凤明; 李智丽; 何建中

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

更新时间：2026-01-21

- Microstructure Transformation and Properties of a 1200 MPa New Type Nb-V Micro-Alloying Bainite Rail Steel
- Special Steel Vol. 41, Issue 5, Pages: 48-51(2020)
- 作者机构：
  
  包钢钢联股份有限公司技术中心,包头,014010
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：28 April 2020，
  
  Online First：06 May 2022，
  
  Published：06 May 2020
- 稿件说明：
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杨维宇, 张凤明, 李智丽, et al. Microstructure Transformation and Properties of a 1200 MPa New Type Nb-V Micro-Alloying Bainite Rail Steel[J]. Special Steel, 2020, 41(5): 48-51.
DOI：

杨维宇, 张凤明, 李智丽, et al. Microstructure Transformation and Properties of a 1200 MPa New Type Nb-V Micro-Alloying Bainite Rail Steel[J]. Special Steel, 2020, 41(5): 48-51. DOI：

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。

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.

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