Effect of shot peening and grit blasting on surface integrity : Influence on residual stresses

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)s230-s235
Journal / PublicationTransactions of Nonferrous Metals Society of China (English Edition)
Issue numberSpecial 2
Publication statusPublished - Sept 2006
Externally publishedYes


The influences of factors such as particle size (0.55-2.2 mm), particle velocity (15-35 m/s) and thickness of work material on the surface integrity were investigated. The residual stresses induced by shot peening or grit blasting were examined. In order to clarify the influences of those factors on residual stress included in the surface integrity, a medium carbon steel (w(C)= 0.45%, 180 HV) was peened by a centrifugal type peening machine using cast steel particles (650-800 HV). The results show that the compressive residual stresses on the peened surface are larger than those of grit blasting; the critical thickness of shot peening is about 50% thicker than that of grit blasting; the high compressive stresses induced by blasting are owing to the wrought or peening effect.

Research Area(s)

  • Critical thickness, Projection area, Residual stress, Shot peening, Surface integrity, X-ray diffraction