Insights into Machining of a β Titanium Biomedical Alloy from Chip Microstructures

Damon Kent; Rizawan Rahman Rashid; Michael Bermingham; Hooyar Attar; Shoujin Sun; Matthew Dargusch

doi:10.3390/met8090710

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Insights into Machining of a β Titanium Biomedical Alloy from Chip Microstructures

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Insights into Machining of a β Titanium Biomedical Alloy from Chip Microstructures

Damon Kent, Rizawan Rahman Rashid, Michael Bermingham, Hooyar Attar, Shoujin Sun and Matthew Dargusch

Metals, Vol.8(9), 710

2018

DOI: https://doi.org/10.3390/met8090710

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Insights Into Machining of a β Titanium Biomedical Alloy from Chip Microstructur...

Abstract

machining

titanium

temperature

strain

grain refinement

ultrafine

nanocrystalline

New metastable β titanium alloys are receiving increasing attention due to their excellent biomechanical properties and machinability is critical to their uptake. In this study, machining chip microstructure has been investigated to gain an understanding of strain and temperature fields during cutting. For higher cutting speeds, ≥60 m/min, the chips have segmented morphologies characterised by a serrated appearance. High levels of strain in the primary shear zone promote formation of expanded shear band regions between segments which exhibit intensive refinement of the β phase down to grain sizes below 100 nm. The presence of both α and β phases across the expanded shear band suggests that temperatures during cutting are in the range of 400-600 °C. For the secondary shear zone, very large strains at the cutting interface result in heavily refined and approximately equiaxed nanocrystalline β grains with sizes around 20-50 nm, while further from the interface the β grains become highly elongated in the shear direction. An absence of the α phase in the region immediately adjacent to the cutting interface indicates recrystallization during cutting and temperatures in excess of the 720 °C β transus temperature.

Details

Title: Insights into Machining of a β Titanium Biomedical Alloy from Chip Microstructures
Authors: Damon Kent (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Rizawan Rahman Rashid (Author) - Swinburne University of Technology
Michael Bermingham (Author) - University of Queensland
Hooyar Attar (Author) - University of Queensland
Shoujin Sun (Author) - Swinburne University of Technology
Matthew Dargusch (Author) - University of Queensland
Publication details: Metals, Vol.8(9), 710; 12
Publisher: MDPI AG
Date published: 2018
DOI: 10.3390/met8090710
ISSN: 2075-4701
Copyright note: Copyright © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99451411002621
Output Type: Journal article

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Collaboration types: Industry collaboration; Domestic collaboration
Web Of Science research areas: Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering

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