基于低成本理念的铁路用38Si7弹簧钢疲劳断裂分析  

Fatigue Fracture Analysis of Spring Steel 38Si7 Used in the Railway Based on Low-Cost Principle

作　　者：孙佳勇[1] 田凯[2] 

机构地区：[1]河北科技大学唐山分院,河北唐山063000 [2]唐山爱信齿轮有限责任公司,河北唐山063000

出　　处：《铸造技术》2015年第8期2031-2033,共3页Foundry Technology

摘　　要：基于低成本理念研究了铁路用38Si7弹簧钢的疲劳断裂行为。结果表明,弹条的显微组织、化学成分和硬度值均符合相关的标准要求,表明其断裂失效和材料自身没有关系。而导致疲劳断裂的原因是断裂位置应力集中较大,且有凹坑缺陷,导致疲劳裂纹的产生和裂纹扩展。The fatigue fracture behavior of the spring steel 38Si7 used in railway was investigated based on low-cost principle. The results show that the microstructure, chemical composition and hardness agree with the requirement of relative standard, indicating the fracture has nothing to do with the material itself. The reasons for the fatigue fracture are that the stress concentration at the fracture is large and there is a defect of pit, which lead to the production and propagation of the fatigue crack.

关 键 词：疲劳断裂 38Si7弹簧钢 显微组织 

分 类 号：TG142.41[一般工业技术—材料科学与工程]