高锰钢辙叉心轨伤损原因分析  

Cause Analysis of Solid Manganese Steel Point Frog Damage

作　　者：张倩 杜涵秋 曹欣旺 吕晶 俞喆 李英奇 胡杰 王凯 ZHANG Qian;DU Hanqiu;CAO Xinwang;LYU Jing;YU Zhe;LI Yingqi;HU Jie;WANG Kai(Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;China Railway Materials Co.,Ltd.,Beijing 100097,China)

机构地区：[1]中国铁道科学研究院集团有限公司金属及化学研究所,北京100081 [2]国铁物资有限公司,北京100097

出　　处：《高速铁路新材料》2024年第6期68-73,共6页Advanced Materials of High Speed Railway

基　　金：中国铁道科学研究院集团有限公司基金项目(2023YJ046)。

摘　　要：对3起高锰钢辙叉心轨轨头伤损典型案例进行失效分析及总结。采用宏微观形貌观察、金相组织观察、理化性能测试等手段对伤损原因进行了综合分析。结果表明:辙叉心轨出现伤损的区域均位于轮轨接触起始范围内,且为逆向过叉,轮轨接触应力及冲击应力超过了辙叉的抗疲劳强度是造成辙叉心轨掉块和水平裂纹的主要原因。高锰钢辙叉心轨轨头存在铸造疏松缺陷、组织晶粒粗大是其产生伤损的次要原因。Three typical cases of solid manganese steel point frog rail head damage were analyzed and summarized.A comprehensive analysis was conducted by macro and micro observation,metallographic structure analysis,physical and chemical performance analysis,and other methods.The results indicate that the damaged area of the point frog is located within the initial range of wheel-rail contact and crossed the frog in the opposite direction.The main causes of spalling and horizontal crack on the frog tread are wheel-rail contact stress and impact stress exceeding the fatigue resistance strength of the frog.The casting porosity and coarse grain structure of the solid manganese steel point frog are the secondary cause of damage.

关 键 词：高锰钢辙叉心轨 掉块 水平裂纹 轮轨接触应力 冲击应力 

分 类 号：U231.41[交通运输工程—道路与铁道工程]