Fracture analysis of microalloyed steel crankshaft
The fracture cause of the microalloyed steel crankshaft was analyzed by methods of chemical com-position analysis,microstructure observation,fracture morphology analysis and hardness of hardened layers analysis.The results indicate that the failure mode of the crankshaft is a typical fatigue fracture,with the fracture location in the transition zone between the connecting rod neck and the balance block,namely the R-angle region.The main reason for the fracture is the rough machining tool marks in the R-angle region,which generate stress concentra-tion and promote the formation of fatigue cracks,ultimately leading to fatigue fracture.
microalloyed steelcrankshaftfatigue fracturecrack sourcecutting marks
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