摘要
通过对曲轴进行宏观形貌、化学成分、拉伸力学性能、冲击性能和断口形貌等进行观察和检测,研究了汽车曲轴发生断裂的原因。结果表明,断裂曲轴的化学成分符合TYPE416材料的规定要求,拉伸力学性能和冲击性能符合ASTM A582/A582M-12标准的要求;汽车曲轴纵剖面上密集分布着细小的点状、条状和串状硫化物类夹杂,断口附近和基材的组织都为索氏体+少量铁素体,源区附近没有发现气孔或者机械加工缺陷存在;汽车曲轴根部存在局部应力集中,条状夹杂物降低了材料的横向性能,使得汽车曲轴在外加应力作用下发生层状纵向开裂。
The cause of the crankshaft fracture was investigated through observing and testing the macro morphology, chemical composition, tensile mechanical properties, impact properties and fracture morphology of the automobile crankshaft. The results show that the chemical composition of the crankshaft in accordance with the provisions of TYPE416 material requirements, tensile mechanical properties and impact properties in accordance with ASTM A582/A582M-12 standards. Automobile crankshaft longitudinal profile densely distribute small dot, strip and clusters of sulfide inclusions, the microstructures near the fracture and substrate are compose of sorbate and a small amount of ferrite. Near the source region is no pores or machining defects. Local stress concentration in the roots of automobile crankshaft, strip inclusions decrease the lateral performance of the material, together with the action of longitudinal cracking in the external layer cause the longitudinal cracking of the automobile crankshaft.
出处
《铸造技术》
北大核心
2017年第10期2423-2425,共3页
Foundry Technology
关键词
曲轴
断裂
检测
组织
性能
crankshaft
fracture
inspection
microstructure
performance
