摘要
针对用40Cr钢制造的重载车轮轴在试车过程中的断裂,具体分析了其宏观和微观断口形态以及轮轴各部位的显微组织特征等,特别就车轮轴断裂性质及其本质原因进行了相关分析和讨论。最终认为:轮轴的断裂属典型的旋转弯曲疲劳断裂,疲劳起源于轮轴根部。轮轴根部表面未经淬火,同时存在磨损条带和表面微裂纹,是导致了轮轴疲劳断裂的主要原因。
Based on the fracture of loco axle made by 40Cr steel , the macro / micro fracture feature and microstructure of the axle have been investigated. The character and inherent origin of fracture in the axle also have been discussed. It is regarded that the fracture of the axle belonged to rotating-bending fatigue which originated from the root of RS, Not having been quenched, both the wearing band and micro-crack existing on the surface of R8 caused rotating-bending fatigue fracture of the axle.
出处
《物理测试》
CAS
2009年第5期54-58,共5页
Physics Examination and Testing
关键词
轮轴
疲劳断裂
表面淬火
磨损条带
loco axle
fatigue fracture
surface quenching
wearing band
