STUDY OF THE SURFACE INTEGRITY IN A SUPER DUPLEX STAINLESS STEEL AFTER TURNING Éd Claudio Bordinassi, Carlos Oscar Correa de Almeida Filho, Sergio Delijaicov, Gilmar Ferreira Batalha e Marco Stipkovic Filho
Resumo: The purpose of this paper was to study the main effects of the turning
in the surface integrity 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 analyzed answers were:
microstructure analysis, surface roughness, cutting force measurements
and the micro-hardness variation. The results showed that was not
possible to find microstructural changes even when the bigger cutting
parameters were used. The other answers were correlated with the
cutting parameters and a good selection was founded to the best
surface integrity generation, that means, that the smaller feed rate,
the smaller cutting speed and the bigger cutting depth provides the
best combination of the best roughness and the micro-hardness values.
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