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Metals 2014, 4(3), 335-358; doi:10.3390/met4030335
Article

On the Physics of Machining Titanium Alloys: Interactions between Cutting Parameters, Microstructure and Tool Wear

*  and
Received: 9 May 2014; in revised form: 19 June 2014 / Accepted: 30 June 2014 / Published: 7 July 2014
(This article belongs to the Special Issue Titanium Alloys)
Abstract: The current work deals with the analysis of mechanisms involved during the machining process of titanium alloys. Two different materials were chosen for the study: Ti-6Al-4V and Ti-55531. The objective was to understand the effect of all cutting parameters on the tool wear behavior and stability of the cutting process. The investigations were focused on the mechanisms of the chip formation process and their interaction with tool wear. At the microstructure scale, the analysis confirms the intense deformation of the machined surface and shows a texture modification. As the cutting speed increases, cutting forces and temperature show different progressions depending on the considered microstructure (Ti-6Al-4V or Ti-55531 alloy). Results show for both materials that the wear process is facilitated by the high cutting temperature and the generation of high stresses. The analysis at the chip-tool interface of friction and contact nature (sliding or sticking contact) shows that machining Ti55531 often exhibits an abrasion wear process on the tool surface, while the adhesion and diffusion modes followed by the coating delamination process are the main wear modes when machining the usual Ti-6Al-4V alloy.
Keywords: Titanium alloys; machinability; Ti-55531; Ti-6Al-4V; tool wear; microstructure; coating effect; lubrication effect; chip formation Titanium alloys; machinability; Ti-55531; Ti-6Al-4V; tool wear; microstructure; coating effect; lubrication effect; chip formation
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.

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MDPI and ACS Style

Nouari, M.; Makich, H. On the Physics of Machining Titanium Alloys: Interactions between Cutting Parameters, Microstructure and Tool Wear. Metals 2014, 4, 335-358.

AMA Style

Nouari M, Makich H. On the Physics of Machining Titanium Alloys: Interactions between Cutting Parameters, Microstructure and Tool Wear. Metals. 2014; 4(3):335-358.

Chicago/Turabian Style

Nouari, Mohammed; Makich, Hamid. 2014. "On the Physics of Machining Titanium Alloys: Interactions between Cutting Parameters, Microstructure and Tool Wear." Metals 4, no. 3: 335-358.


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