东北大学学报（自然科学版）

东北大学学报（自然科学版） ›› 2013, Vol. 34 ›› Issue (11): 1625-1629.DOI: 10.12068/j.issn.1005-3026.2013.11.025

• 机械工程 • 上一篇    下一篇

楔横轧高铁车轴钢25CrMo4塑性损伤形成机理

霍元明1，王宝雨1，林建国1,2，周靖1   

  1. (1北京科技大学机械工程学院，北京100083；2帝国理工学院机械工程系，伦敦SW72AZ)
  • 发布日期:2013-07-09
  • 通讯作者: 霍元明
  • 作者简介:霍元明(1984-)，男，山西运城人，北京科技大学博士研究生;王宝雨(1964-)，男，山东成武人，北京科技大学教授;林建国(1958-)，男，英国伦敦人，帝国理工大学教授.
  • 基金资助:
    国家自然科学基金资助项目(51075030)；国家科技重大专项(2009ZX04014-074)；教育部高等学校博士学科点专项科研基金资助项目(20120006110017)；“现代交通金属材料与加工技术北京实验室”资助项目.

Damage Mechanisms Research for the HighSpeed Railway Axle Steel 25CrMo4 During Hot Cross Wedge Rolling

HUO Yuanming1， WANG Baoyu1， LIN Jianguo1,2， ZHOU Jing1   

  1. 1. School of Mechanical Engineering， University of Science and Technology Beijing， Beijing 100083， China; 2. Department of Mechanical Engineering， Imperial College， London SW72AZ， UK.
  • Published:2013-07-09
  • Contact: WANG Baoyu
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摘要： 为揭示楔横轧高铁车轴塑性损伤形成机理，采用近似分析方法对车轴钢25CrMo4试件在三个温度(1040，1100和1160℃)和两个应变速率(10和100s-1)下做不同形变量的压缩和拉伸，获取各应力曲线以及微观组织.结合微观组织对比应力曲线得出结论:压缩时的软化机制由回复和再结晶主导，而拉伸时的软化机制由塑性损伤主导；塑性损伤分为晶界损伤和夹杂损伤两种，且经历形核，长大和汇聚三个阶段；流线处是晶粒细化，晶界损伤及夹杂损伤最容易发生的变形带；夹杂损伤分为晶界和晶内两种；拉应力是造成楔横轧高铁车轴塑性损伤的主要原因.

关键词: 楔横轧, 高铁车轴钢, 25CrMo4, 高温压缩, 高温拉伸, 塑性损伤

Abstract: The approximate analysis method is used to make clear the damage mechanisms during cross wedge rolling. Hot tension and compression of 25CrMo4 specimens were implemented under three temperatures (1040， 1100 and 1160℃) and two strain rates (10 and 100s-1) on thermalmechanical simulator. The true stressstrain curve and microstructure was obtained and compared under tension and compression condition. Some conclusions can be drawn: The recovery and recrystallization leads to the softening mechanism during compression， and the plastic damage leads to the softening mechanism during tension. Plastic damage undergoes three phases: nucleation， growth and coalescence， whose type involves grain boundary damage and inclusion damage. Streamline is some place where refined grain， grain boundary damage and inclusion damage are apt to take place. The inclusion damage consists of that at grain boundary and inside grain. The axial tension stress is the main damage in highspeed railway axle during cross wedge rolling.

Key words: cross wedge rolling, highspeed railway axle steel, 25CrMo4, hot compression, hot tension, plastic damage

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