高速车轮钢断裂韧性与组织结构的关系
Relationship Between Fracture Toughness and Microstructure of High-speed Railway Wheel Steel
洪艳平 1阎军 1苏世怀 2江波 2沈晓辉 1章静1
作者信息
- 1. 安徽工业大学材料科学与工程学院,安徽马鞍山243002
- 2. 马鞍山钢铁股份有限公司,安徽马鞍山243000
- 折叠
摘要
以CL50D车轮钢为研究对象,对断裂韧性水平不同的试样断口进行显微组织分析,研究组织中晶粒尺寸、铁素体含量、珠光体片层间距对材料断裂韧性的影响.结果表明,车轮钢断裂韧性随着平均晶粒尺寸、5％最大平均晶粒尺寸的增大而降低,晶粒越均匀,断裂韧性越高；断裂韧性起初随铁素体含量的增加而增大,达到一个峰值后随着铁素体含量的增加而减小；在珠光体片层间距为0.13～0.16μm的范围内,断裂韧性与珠光体片层间距的相关性不大.
Abstract
Microstructures of sample fracture of CL50D wheel steel in different fracture toughness levels were analyzed. Effects of grain size, ferrite conent and pearlite lamellar spacing on fracture toughness were studied. Results show that fracture toughness of wheel steel increases with decreasing of average grain size and 5% maximum average grain size. The more uniform of grain size distributes, the higher of fracture toughness is. At the beginning fracture toughness increases as the increase of volume fraction of ferrite, reaches a peak value, then reduces as the increase of volume fraction of ferrite. When the range of pearlite lamellar spacing is 0.13 ~ 0.16 μm, there is little correlation between fracture toughness and pearlite lamellar spacing.
关键词
车轮钢/断裂韧性/显微组织Key words
wheel steel/fracture toughness/microstructure引用本文复制引用
基金项目
科技部863重点项目(2008AA030703)
出版年
2012
NETL
NSTL
维普
万方数据