Experimentation And Analysis Of Machined Surface Quality For Cutting304Austenitic Stainless Steel

304austenitic stainless steel has been widely used in the aviation, nuclear powerindustry, because of its excellent synthetic property. The304is a typical difficult-to-cutmaterial, how to improve the cutting surface quality has always been the problem. In thispaper, a reasonable test program was designed to study the machinability of304stainlesssteel and machined surface quality, according to the characteristics of304stainless steel.The main research contents are as follows:(1) The rational cutting parameters were designed by using single-factor method andorthogonal method, and the reasonable experiment program and surface quality testingprogram were developed. Poor machinability was show while cutting304stainless steel,for example, making big cutting forces, chip easily wrapped around the tool or workpiece,serious work-hardening.(2) The effects of cutting parameters on cutting forces and surface roughness wereresearched by using the orthogonal data processing method, and process optimization wasdone. The research shows that cutting force decreases as cutting speed increases, increasesas feed rate, cutting deep and blade radius increases. Roughness was main affected by feedrate and blade radius, and it increases as feed rate increases.(3) It shows that phase transition didn’t happen while using sharp cutting tools by X-raydiffraction (XRD) test, but it happened while using the flank wear tool at bigger feed rateand bigger tool flank wear(VB). Quantitative analysis shows that the martensite content isrelated with strain, the larger strain is the more martensite was caused.(4) Work-hardening was studied from the micro-hardness and microstructure changes.Micro-hardness distribution of the machined sub-surfaces was got with the Vickershardness measurement and microstructure of the hardened layer was observed withscanning electron microscopy. The results show serious hardening that the degree of workhardening is more than150%, and the depth of machining affected zone is more than100μm.Feed rate and cutting deep effect work-hardening more, and then the cutting speedand blade radius. Metallographic observation show that sub-hardened layer consists of thethermal-force influenced layer and the force influenced layer.