Effects of shot peening and artificial surface defects on fatigue properties of 50CrV4 steel

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dc.contributor.authorSaklakoglu N.
dc.contributor.authorBolouri A.
dc.contributor.authorIrizalp S.G.
dc.contributor.authorBaris F.
dc.contributor.authorElmas A.
dc.date.accessioned2024-07-22T08:06:10Z
dc.date.available2024-07-22T08:06:10Z
dc.date.issued2021
dc.description.abstractShot peening processes are commonly used for improving the fatigue properties of steels. Shot peening introduces a compressive residual stress field in the near surface of steel, which can reduce or stop the growth of fatigue cracks and improve fatigue properties. This study experimentally investigated the effect of shot peening on the fatigue properties of 50CrV4 steel alloys with different artificial surface defects. Drilling tools were used to introduce different artificial defects with root radii of 0.585 mm and 0.895 mm on the surface of unpeened samples. The shot peening was applied to the drilled and undrilled samples. Scanning electron microscopy (SEM) observations, micro-hardness and X-ray diffraction residual stress measurements were conducted to analyse the characteristics of the shot-peened and unpeened samples. The results show that the shot peening leads to the transformation of the retained austenite to martensite in the near-surface microstructure. The hardness rates of the surface and near surface both increase by 8% after the shot peening. The peened samples exhibit compressive residual stresses with a high degree of isotropy in the near surface. The fatigue properties of samples were experimentally evaluated by conducting 3-point bending tests. The results indicate that the shot peening improves the fatigue life of drilled and undrilled samples. For the defects with the root radius of 0.895 mm, the shot peening leads to a 500% improvement in the fatigue life compared to unpeened samples regardless of defect depth. For the defects with the root radius of 0.585 mm, the improvement in fatigue life is 40% for the defect depth of 0.2 mm compared to unpeened samples. The improvement increases to 60% and 200% by increasing the defect depths to 0.4 mm and 0.6 mm. The fatigue properties are linked to the changes in the features of defects mainly caused by the deformation hardening and compressive residual stress after shot peening. © 2021, The Author(s).
dc.identifier.DOI-ID10.1007/s00170-020-06532-y
dc.identifier.issn02683768
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/13404
dc.language.isoEnglish
dc.publisherSpringer Science and Business Media Deutschland GmbH
dc.rightsAll Open Access; Hybrid Gold Open Access
dc.subjectAlloy steel
dc.subjectBending dies
dc.subjectBending tests
dc.subjectBinary alloys
dc.subjectChromium alloys
dc.subjectChromium metallography
dc.subjectChromium steel
dc.subjectDrilling machines (machine tools)
dc.subjectInfill drilling
dc.subjectMicrohardness
dc.subjectResidual stresses
dc.subjectScanning electron microscopy
dc.subjectShot peening
dc.subjectSurface defects
dc.subjectVanadium alloys
dc.subjectVanadium metallography
dc.subjectVanadium steel
dc.subject3-point bending
dc.subjectArtificial defects
dc.subjectArtificial surfaces
dc.subjectCompressive residual stress
dc.subjectFatigue cracks
dc.subjectFatigue properties
dc.subjectNear-surface microstructures
dc.subjectRetained austenite
dc.subjectFatigue of materials
dc.titleEffects of shot peening and artificial surface defects on fatigue properties of 50CrV4 steel
dc.typeArticle

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