Impact wear properties of dissimilar joints between bainitic frogs and pearlite rails  

作　　者：Pin-yong Zeng Chun-guang Zuo Xiao-yu Zhang Wei Li 

机构地区：[1]Tribology Research Institute,Southwest Jiaotong University,Chengdu,610031,Sichuan,China

出　　处：《Journal of Iron and Steel Research International》2024年第1期275-287,共13页

基　　金：The work was supported by the National Key Research and Development Project(2017YFB0304500).

摘　　要：The impact wear behavior and damage mechanism of dissimilar welded joints between U26Mn frog and U75 V rail before and after normalizing treatment were studied by cyclic impact tests.The experiment indicated that the impact wear volume of the joints increased with the increasing number of impact cycles.The main wear mechanisms include pitting wear,mild fatigue wear,delamination wear,and fatigue wear,and plastic deformation was the primary impact wear mechanism.Among them,fatigue wear had the greatest influence on wear volume,while other wear mechanisms had limited effect.The impact wear resistance of the base material was better than that of the heat-affected zone.Normalizing treatment was beneficial to improving the impact wear resistance of welded joints owing to its effect to promote pearlite recovery,grain refinement,and uniform distribution of grains.The martensite generated in the rail welded joints aggravated the impact wear damage to the materials,which should be avoided.

关 键 词：Dissimilar welded joint Impact wear Bainitic steel Damage mechanism Wear rate 

分 类 号：TG142[一般工业技术—材料科学与工程]