Study on the Influence of Strengthening Grinding Process on the Surface Integrity of 30CrMnSiA

Abstract

Abstract 30CrMnSiA, as a high-strength steel with excellent toughness and superior hardenability, was extensively used in the aerospace industry. At the same time, its lower surface hardness limits its application in impact and vibration environments. The surface of 30CrMnSiA was enhanced using the strengthening grinding process (SGP) technique in this work. The influence of SGP jet pressure on the surface integrity of 30CrMnSiA steel was studied, such as morphology, microstructure, roughness, and hardness. The study indicated that 30CrMnSiA samples treated by SGP reduced surface flatness, primarily due to the formation of plenty of irregular micro-pits by SGP. The greater the jet pressure leads to the more acute surface height fluctuation and the larger surface roughness. Furthermore, SGP notably enhanced the surface hardness and induced the formation of a strengthened layer. This improvement can be attributed to promoting martensite content and grain refinement within the surface layer structure facilitated by the SGP. The harder the surface hardness with the finer grain size, the thicker the strengthening layer with higher jet pressure.