Microstructural modifications and material response in machining of steels

B. Changeux; J.-L. Lebrun

doi:doi:10.1051/jp4:2001427

Numéro		J. Phys. IV France Volume 11, Numéro PR4, Septembre 2001 4^th European Mechanics of Materials Conference on Processes, Microstructures and Mechanical Properties


Page(s)		Pr4-213 - Pr4-220
DOI		https://doi.org/10.1051/jp4:2001427

4^th European Mechanics of Materials Conference on Processes, Microstructures and Mechanical Properties

J. Phys. IV France 11 (2001) Pr4-213-Pr4-220
DOI: 10.1051/jp4:2001427

Microstructural modifications and material response in machining of steels

B. Changeux¹ and J.-L. Lebrun²

¹ LM3, ENSAM-Paris, 151 boulevard de l'Hôpital, 75013 Paris, France
² LPMI, ENSAM-Angers, 2 boulevard du Ronceray, 49035 Angers cedex, France

Abstract
In machining with a cutting tool (turning, milling, drilling,...), the loading conditions for the cut material in the cutting zone are extremely severe, in terms of strain (some hundred %), strain rates (~10⁵s^-1), temperatures (some hundred °C) and temperature rates (~10⁶ K.s^-1). The subsequent microstructural changes are analysed and the problem of the evaluation of the behaviour of the cut material (i.e. of the chip and the workpiece) is discussed, in the view of building a predictive cutting model. X-ray diffraction, microscopy, as well as analytical modelling are used to investigate the small zone under solicitation ahead of the tool tip. Texture, hardness, phase transformation data inside the cutting products attest a very strong heterogeneity in the thermo-mechanical loading from places of the cutting zone to others, which makes cutting a problem difficult to treat under a unique behaviour view.