Resumo

JACAS-CABRERA, Mario; RODRIGUEZ-MOLINER, Tania  e  LOPES-DA SILVEIRA, José Luís. The influence of cutting speed and feed rate in surface integrity of aisi 1045. Ingeniería Mecánica [online]. 2015, vol.18, n.3, pp. 203-210. ISSN 1815-5944.

The aim of this research is to study the influence of cutting speed and feed rate on surface integrity of AISI-1045 subjected to a turning process. The specimens were in annealed condition (81 HRB). A 3² factorial experiment design was employed using low, medium and high levels of the two variables in study, performing 9 experiments with a replica. The surfaces were evaluated through the measurements of surface roughness, surface residual stresses, nano-indentation hardness and analyzing the deformed layer. Results corroborated the great influence of feed rate on surface roughness. The results of the residual stresses have shown the influence of cutting speed as well as feed rate in the behavior of circumferential and axial stress respectively. From the analysis of the microstructure was feasible to observe the tertiary deformation zone due to the machining process. The hardness measured by nano-indentation showed that the thickness of this hardened zone can reach up to 50 µm.

Palavras-chave : superficial integrity; surface roughness; nano-indentation; surface deformation.

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