摘要
以实际铁路线路上过早失效的高锰钢辙叉和贝氏体钢辙叉为研究对象,利用金相、扫描电镜、透射电镜和M(?)ssbauer谱等分析方法研究两种失效辙叉残体磨面组织结构的变化,并探讨其失效机理。结果分析表明,两种辙叉在服役过程中表面组织都发生纳米化反应,高锰钢辙叉在服役过程中表面奥氏体内产生少量碳原子聚集的现象,其失效形式是磨损、压溃变形和疲劳剥落;贝氏体钢辙叉失效的原因是磨损和氢致脆性剥落。从而提出增加辙叉使用寿命和提高铁路运行安全的方法和途径。
With early failed high manganese steel and bainite steel crossings on actual railway line as the study object, the microstructure changes in the worn surface layer of the crossings are investigated by using metallurgical microscopy, SEM, TEM, MOssbauer spectroscopy. In the mean time the failure mechanisms of the crossings are analyzed. The research results indicate that the microstructure in the worn surfaces of both crossings changes to nanocrystalline, and the carbon atoms get together in the worn surface of the high manganese steel crossing in service. The failure mechanism of the high manganese steel crossing is wear, collapse deformation and fatigue spaUing, however, the failure mechanism of the bainite steel crossing is wear, hydrogen induced brittle spalling. Accordingly, some new methods are put forward to increase the lifetime of the crossings and enhance the safety of the railway system.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2008年第12期232-237,243,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(50671091)
河北省自然科学基金(E2006001026)资助项目
关键词
辙又
高锰钢
贝氏体钢
失效
Crossing High manganese steel Bainitesteel Failure
