Surface integrity characterization of austenitic, martensitic and ferritic stainless steel under different grinding process

Abstract

Grinding is the final process in the manufacturing of precise components with adequate surface integrity. Surface integrity has significant effect on the working life of component. The aim of the present work is to experimentally investigate the effect of eco-friendly grinding i.e. dry, belt and pedestal grinding on the surface integrity of different stainless steels (SS) like austenitic AISI 304SS, martensitic AISI 410SS, and ferritic AISI 430SS. Surface integrity was assessed by surface topography, surface roughness, microchip morphology, metallographic of microchip and thermal damage of ground surface. The surface topography of microchip and ground samples was observed by scanning electron microscope (SEM) and energy dispersive x-ray spectroscopy (EDX). Grinding performance was investigated in terms of grinding force. Further, corrosion performance of different grade SS was measured using potentiodynamic corrosion test in 0.9N NaCl solution under different grinding condition. The result shows that excellent ground surface quality with lowest surface roughness was obtained in AISI 304SS under all grinding modes. Spherical and ribbon microchips were observed during belt and pedestal grinding. SEM-EDX analysis indicated that iron-chromium oxide nodules were formed on ground surface and microchip. Lower grinding force was obtained during dry grinding of AISI 430SS. Finally, maximum corrosion rate was found in all grades of stainless steel during pedestal grinding owing to rupture of Cr2O3 protective layer. © 2019 IOP Publishing Ltd.