Experimental study of Built-Up Layer formation during machining of high strength free-cutting steel

Machinability of high-strength steels can be improved without degrading the mechanical properties using metallurgical solutions to create or retain non-metallic inclusions. Such a metallurgical treatment usually leads, during machining, to the appearance of so-called Built-Up Layers (BULs) or transf...

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Bibliographic Details
Published in:Journal of materials processing technology 2016-10, Vol.236, p.204-215
Main Authors: Desaigues, Jean-Edouard, Lescalier, Christophe, Bomont-Arzur, Anne, Dudzinski, Daniel, Bomont, Olivier
Format: Article
Language:English
Subjects:
Built-Up Layer
Engineering Sciences
High strength steels
Inclusions
IR thermography
Machinability
Mechanical engineering
Mechanics
Mechanics of materials
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Summary:Machinability of high-strength steels can be improved without degrading the mechanical properties using metallurgical solutions to create or retain non-metallic inclusions. Such a metallurgical treatment usually leads, during machining, to the appearance of so-called Built-Up Layers (BULs) or transfer layers on the cutting tool. These BULs protect the tool against wear, and longer tool life or better productivity is achieved. Formation of such BULs on the cutting tool depends on many parameters i.e. tool geometry, tool material, cutting conditions. This paper proposes an experimental methodology to identify and describe BUL occurring on the tool rake face. Machining tests were carried out with a high strength free-cutting steel using an untested AlSiTiN coated carbide tool. BULs morphology and composition were determined for various cutting conditions. Temperature distributions at the tool-chip interface were measured during the cutting tests using an infrared camera. BUL appearance was then linked to the thermo-mechanical conditions at the tool-chip interface.
ISSN:0924-0136
1873-4774
DOI:10.1016/j.jmatprotec.2016.05.016