Title: Study of phase transformation and work hardening phenomenon during drilling of Ti-5553 and Ti-64

Authors: David Ping Yan; Guy Littlefair; Tim Pasang

Addresses: School of Engineering, AUT University, 24 St. Paul Street, Auckland 1142, New Zealand. ' School of Engineering, Deakin University, Geelong, Victoria 3217, Australia. ' School of Engineering, AUT University, 24 St. Paul Street, Auckland 1142, New Zealand

Abstract: Titanium 5553 is a recently developed modification of Russian near-? titanium alloy VT-22 which has applications and potential particularly in the aerospace industry for such key components as landing gear. However, indications are that Ti-5553 has poorer machinability characteristics than other Ti alloys and a comprehensive and far-reaching analysis is a necessary research imperative. This paper presents the result of phase transformation and work hardening during drilling of Ti-5553 compared with Ti-64. The aim of this research work is to optimise the machining condition for Ti-5553, in which the ? to ? phase transformation, together with material work hardening could be fully understood. Analysis of machinability indicators, such as subsurface micrograph and hardness of drilled samples and drilling forces and torques, demonstrated that Ti-5553 generally has poorer machinability characteristics than Ti-64 and to some extent this variation has been quantified to allow for further and more detailed investigation.

Keywords: Ti-5553; machinability; titanium drilling; phase transformation; work hardening; titanium alloys.

DOI: 10.1504/IJMMM.2011.043089

International Journal of Machining and Machinability of Materials, 2011 Vol.10 No.4, pp.264 - 279

Received: 14 Jul 2010
Accepted: 07 Oct 2010
Published online: 30 Dec 2014 *

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