Influence of Nano-Finishing Process on Fatigue Life of Stainless Steel-304

Abstract

Being labor-intensive and challenging to regulate, precision finishing of internal surfaces and complicated geometries is always an issue. In order to achieve the desired geometrical accuracy and surface qualities, undesired excess material is often removed from the work piece surface using small multiple cutting edges of abrasives. The existing traditional finishing procedures alone are unable to produce the necessary surface finish and other characteristics due to the introduction of new challenges to machine materials (carbide, composite materials, etc.) and complex geometrical shapes of engineering components. A new method for precision finishing namely Magneto Rheological Abrasive Flow Finishing (MRAFF) was developed for fine finishing of complex interior geometries ranging from optical glasses to hard crystals using smart Magneto Rheological polishing fluid. In the viscoplastic foundation of silicone oil, ferrous powdered and cerium oxide abrasives are dispersed to create magneto rheological (MR) polishing fluid. It modifies its rheological behaviour when an external magnetic field is present. The final surface finish is achieved to the MR-polishing fluid's clever behaviour, which is used to precisely manage the finishing force. As a part of the research work, ferrous and abrasive nano particles have been prepared and analysed by scanning electron microscope (SEM) and MR-fluid also prepared by magnetic stirrer method.