Abstract
As the first approach to study on grit blasting, basic characteristics of grit blasted surface and surface layer are described, measuring such factors as average dent size, surface roughness, hardness distribution, harf width and surface residual stress. Grit blasting was performed on steel (C:0.45%) by centrifugal blasting machine. The results obtained from experiments are as follows : (1) Average diameter of dent is in proportion to size D and root of velocity V of grit. (2) Surface roughness is in proportion to D and V. (3) Maximum hardness on the blasted surface is about 15% more than that of shot peened and the depth of work hardened layer is 40-50% less than shot peened. (4) Residual stress on blasted surface is compressive and the value is 12-35% less than shot peened.
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