STUDY OF RESIDUAL STRESS IN A SUPER DUPLEX STAINLESS STEEL AFTER TURNING Éd Claudio Bordinassi, Marco Stipkovic Filho, Gilmar Ferreira Batalha, Sergio Delijaicov e Nelson Batista de Lima
Resumo: The purpose of this paper was to study the main effects of the turning in the residual stress generation of the duplex stainless steel ASTM A890-Gr6A. The focus of the work was the finishing operations and a complete factorial planning was used, with 2 levels and 5 factors. The tests were conducted on a turning center with carbide tools and the main entrances variables were: tool material class, feed rate, cutting depth, and cutting speed. The residual stress measurements were conducted by x-ray diffraction technique. The results correlated the residual stress with the cutting parameters and its better combination was founded for it's best generation. The smaller feed rate (0.1 mm/v), smaller cutting speed (110 m/min) and the greater cutting depth (0.5 mm) provided the smaller values for the tensile residual stress. The paper contribute for the study of the super duplex stainless steel, considering that no one researches was founded for the studied topics in this material in witch presents different behavior in machining when compared with another stainless steels.
|