COMPARISON OF GRINDABILITY OF HIPPED AUSTENITIC 316L, DUPLEX-2205 ANDSUPER DUPLEX-2507 AND AS-CAST-304 STAINLESS-STEELS USING ALUMINA WHEELS

The grinding ratios, grinding forces and surface roughnesses of HIPped austenitic (PM 316L), duplex (PM 2205) and super duplex (PM 2507) as well as as-cast (AC 304) stainless steels were measured during grindin g using alumina wheels. It was observed that the grinding ratio decrea sed in the following order: AC 304, PM 316L, PM 2205 and PM 2507 steel , whilst the grinding force increased in the order: AC 304, PM 2205, P M 316L and PM 2507 steel. The surface roughness increased in the order : PM 316L, PM 2205, PM 2507 and AC 304 steel. It was observed also tha t the ground steel surfaces work-hardened in the following increasing order: AC 304, PM 316L, PM 2205 and PM 2507 steel. Abrasive plowing-we ar grooves and adhesive built-up layers of alumina particles were obse rved on the ground surfaces of the steels, increasing in the following order: AC 304, PM 316L, PM 2205 and PM 2507 steel. Examination of the ground surface profiles of the workpieces showed that there were a co nsiderable number of microcracks and microvoids on the ground surfaces of the steels, increasing in the following order: PM 316L, PM 2205, P M 2507 and AC 304 steel. Finally, the effects of work hardening, chemi cal interactions between the alumina wheel and the workpiece, as well as microcracks and microvoids, on the grindability of the stainless st eels studied were investigated.