オーステナイト系ステンレスのグリットブラストによる加工層の変態

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This paper describes on the transformation produced by grit blasting for the austenitic stainless steel. Grit blasting are performed by steel grit and a centrifugal peening machine. Discussed factors are X-ray diffraction pattern, surface roughness, hardness distribution, half width, residual stress and residual stress distribution. Following results are obtained. (1) Diffraction pattern and magnetic characteristics are changed by compressive deformation and grit blasting, but martensite structure was not observed under the microscope. (2) Peak intensity of (211) plane that shows transformation is in proportion to 1.2th power of compressive strain. (3) Transformation of the surface produced by grit blasting is independent of blasting conditions. (4) Hardness distributions by grit blasting change from work-hardening to work-softening with the increase in prestrain and also half width decreases in the work-softened zone, then this phenomenon shows the recovery of the prestrain on crystal by grit blasting. (5) Transformation produced by grit blasting are not concerned with surface residual stress and work-softening. (6) The maximum work-softening ratio was 8.3% in this experiment.
明治大学の論文