SEM and EDS Characterisation of Layering TiOxGrowth onto the Cutting Tool Surface in Hard Drilling Processes of Ti-Al-V Alloys

Author:

Álvarez M.1,Salguero J.1ORCID,Sánchez J. A.2,Huerta M.1,Marcos M.1ORCID

Affiliation:

1. Mechanical Engineering and Industrial Design Department, University of Cadiz, c/Chile 1, 11002 Cadiz, Spain

2. Department of Mechanical Engineering, University of the Basque Country, Alda. de Urquijo s/n, 48013 Bilbao, Spain

Abstract

Scanning electron microscopy (SEM) has been used to identify and analyse the secondary adhesion effect precursors formed during the dry drilling processes of Ti-6Al-4V alloy over the rake face and flute of the drilling tools. Subsequent analysis with energy dispersive spectroscopy (EDS) was enabled to distinguish its compositional characteristics. Thus, according to the EDS obtained data, a stratified multi built-up layer (MBUL) composed by TiOxis formed over the rake face of the tool. Furthermore, this multi-layer adhered allows initially the built-up edge (BUE) development close to the edge of the tool by a mechanical adhesion mechanism. In a second step, it is responsible for the formation of a thicker secondary BUL which avoids the chip flow, and it provokes the tool collapse. These mechanisms are different from those observed in the dry machining of other alloys such as steels, nickel-based alloys, or aluminium alloys.

Publisher

Hindawi Limited

Subject

General Engineering,General Materials Science

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