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Coatings 2017, 7(8), 127; https://doi.org/10.3390/coatings7080127

Investigation of Coated Cutting Tool Performance during Machining of Super Duplex Stainless Steels through 3D Wear Evaluations

1
McMaster Manufacturing Research Institute (MMRI), Department of Mechanical Engineering, McMaster University, 1280 Main StreetWest, Hamilton, ON L8S4L7, Canada
2
Department of Mechanical and Materials Science, Catholic University of Santa Catarina, Rua Visconde de Taunay, 427-Centro, Joinville-SC 89203-005, Brazil
3
Biointerfaces Institute, McMaster University, ETB 422, 1280 Main Street West, Hamilton, ON L8S 0A3, Canada
*
Author to whom correspondence should be addressed.
Received: 17 July 2017 / Revised: 7 August 2017 / Accepted: 14 August 2017 / Published: 17 August 2017
(This article belongs to the Special Issue Coatings for Cutting Tools)
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Abstract

In this study, the wear mechanisms and tribological performance of uncoated and coated carbide tools were investigated during the turning of super duplex stainless steel (SDSS)—Grade UNS S32750, known commercially as SAF 2507. The tool wear was evaluated throughout the cutting tests and the wear mechanisms were investigated using an Alicona Infinite Focus microscope and a scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS). Tribo-film formation on the worn rake surface of the tool was analyzed using X-ray Photoelectron Spectroscopy (XPS). In addition, tribological performance was evaluated by studying chip characteristics such as thickness, compression ratio, shear angle, and undersurface morphology. Finally, surface integrity of the machined surface was investigated using the Alicona microscope to measure surface roughness and SEM to reveal the surface distortions created during the cutting process, combined with cutting force analyses. The results obtained showed that the predominant wear mechanisms are adhesion and chipping for all tools investigated and that the AlTiN coating system exhibited better performance in all aspects when compared with CVD TiCN + Al2O3 coated cutting insert and uncoated carbide insert; in particular, built-up edge formation was significantly reduced. View Full-Text
Keywords: super duplex stainless steel; tool wear mechanisms; tribo-films; chip characteristics; surface integrity super duplex stainless steel; tool wear mechanisms; tribo-films; chip characteristics; surface integrity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Seid Ahmed, Y.; Paiva, J.M.; Covelli, D.; Veldhuis, S.C. Investigation of Coated Cutting Tool Performance during Machining of Super Duplex Stainless Steels through 3D Wear Evaluations. Coatings 2017, 7, 127.

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