摘要
对陇海铁路一车站过早失效的贝氏体钢组合辙叉心轨进行材料及力学性能试验,从微观角度对其过早失效的原因进行了分析。结果表明,贝氏体钢组织中存在大量不稳定的块状残余奥氏体和较多的带尖锐棱角的TiN及Ti类复合夹杂物,是辙叉心轨过早失效的主要原因。从辙叉钢组织角度,要控制贝氏体组织形态,尤其是消除块状残余奥氏体;从辙叉钢冶金质量角度,不仅要控制较大尺寸夹杂物的数量和尺寸,也要控制细小的夹杂物,尤其是TiN等带尖锐棱角的夹杂物。
The material and mechanical properties of bainite steel composite frog center rail which failed prematurely in a station of Lanzhou-Lianyungang Railway were tested,and the causes of its premature failure were analyzed from the microscopic point of view.The results show that there are a lot of unstable massive retained austenite and a lot of TiN and Ti compound inclusions with sharp edges and corners in the bainitic steel structure,which are the main reasons for the premature failure of frog center rail.From the point of view of frog steel structure,it is necessary to control the morphology of Bainite,especially to eliminate the massive retained austenite.From the perspective of metallurgical quality of frog steel,it is necessary to control not only the quantity and size of inclusions with large size,but also small inclusions,especially those with sharp edges and corners such as TiN.
作者
施庆峰
杨志南
张福成
SHI Qingfeng;YANG Zhinan;ZHANG Fucheng(China Railway Baoji Bridge Group Co.Ltd.,Baoji Shaanxi 721006,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao Hebei 066004,China;North China University of Science and Technology,Tangshan Hebei 063200,China)
出处
《铁道建筑》
北大核心
2022年第11期32-35,共4页
Railway Engineering
基金
国家重点研发计划(2021YFB3703500)。
关键词
客货共线铁路
辙叉心轨
试验研究
贝氏体钢
残余奥氏体
夹杂物
mixed passenger and freight railway
frog center rail
experimental study
bainitic steel
retained austenite
inclusion
