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Fracture Analysis on 50 CrVA Steel Dished Spring
Author(s): 
Pages: 65-68
Year: Issue:  4
Journal: Heat Treatment

Keyword:  50CrVA steeldished springmicrostructurefatigue fracturework-hardening;
Abstract: Premature fracture of 50CrVA steel dished spring used in a oil vat occurred in service.The chemical composition,hardness,non-metallic inclusions,decarburized case,microstructure and fracture morphology of the dished spring were checked by direct-reading spectrometer,Rockwell hardness tester,OM and SEM.The results show that the rupture of the 50CrVA dished spring is a fatigue fracture,and the crack initiation arises from the action of work-hardened case of the support surface in combination with inclusions in the sublayer.Service life of the dished spring may be increased by an improvement on the raw material purity and increase in working quality of the surface.
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