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Mougo, Adriane Lopes
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document
INFLUENCE OF MICROMILLING ON THE SURFACE INTEGRITY OF SUPER DUPLEX STAINLESS STEEL*
Abstract
Super duplex stainless steel presents a biphasic structure composed by ferrite and austenite with different characteristics and properties. In the micromilling process the cutting edge radius has similar dimensions to the grain size. The biphasic structure found in this material could influence on the cutting tool life and the surface integrity of the workpiece. Due to its low machinability, caused by high hardening level and low thermal conductivity, the process can produce built-up edge and high surface roughness (Ra). In this work it is performed an experimental study of the micromilling of super duplex UNS 32750 and the influence of the cutting speed (Vc) and feed per tooth (fz) on the surface integrity and tool wear. The design of experiments considered two levels and three replicates. Results indicate the increase of roughness for bigger feed per tooth, small influence of the cutting parameters on the burr formation. The tool presented flank wear after the experiments.