Effects of Strength-Modified Grinding on the Surface Microstructure and Mechanical Properties of 30CrMnSiA Bearing Steel

The novel strengthen-modified grinding technique (SMGT) treatment was carried out on 30CrMnSiA bearing steels to investigate the effect of jet pressure (0.2–0.6 MPa) and angle (30–90°) its surface micromorphology, microstructure, mechanical properties. results show that, under compound effects impact steel beads abrasive powder micro-cutting, specimens treated by SMGT has a microstructure with plenty micropits inside pits overlaps between pits. pit width, depth, bulge height positively correlate pressure. depth angle, while width negatively correlates angle. When morphology is produced, plastic deformation leads grain refinement, lattice distortion induces retained austenite transformation martensite. Grain refinement increased martensite content are main reasons for significant increase in hardness SMGT-treated specimen surface. With optimized processing parameters, size reduced 10.14 µm, layer rose 51.35% 377.6 HV0.2.