Title: An approach to residual stress measurement in ball-end milling process on Ti-6Al-4V ELI titanium alloy

Authors: Jorge Andrés García-Barbosa; Ernesto Córdoba-Nieto

Addresses: Facultad de Ingeniería Mecánica, Universidad Santo Tomás (Colombia), Carrera 9 No. 51-11, Bogotá, Colombia ' Departamento de Ingeniería Mecánica y Mecatrónica, Universidad Nacional de Colombia, Carrera 45 No. 26-85, Bogotá, Colombia

Abstract: Evaluation of the residual stress state in a surface, obtained by means of the ball-end milling process, is important to ensure the reliability of the machined product during its life cycle. X-ray diffraction is one of the techniques most commonly used for evaluating residual stresses. A review of the specialised bibliography shows the shortage of a methodology for this type of studies on materials with more than one crystalline phase. In this experimental research for evaluating the state of residual stress in a series of samples machined with a ball-end mill on the Ti-6Al-4V ELI titanium alloy, it was found that they were subject to compressive residual stress. An electropolished surface of the same material was taken as a reference pattern. The X-ray diffraction analyses were carried out on the crystallographic planes {1012} and {1013} of the alpha phase of the alloy.

Keywords: X-ray diffraction; residual stress measurement; residual stress state; surface integrity; ball-end milling; Ti-6Al-4V titanium alloy.

DOI: 10.1504/IJMMM.2020.107048

International Journal of Machining and Machinability of Materials, 2020 Vol.22 No.3/4, pp.197 - 211

Received: 15 Nov 2018
Accepted: 17 Mar 2019

Published online: 10 Apr 2020 *

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