Preprint Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 17 August 2018 / Approved: 17 August 2018 / Online: 17 August 2018 (13:37:00 CEST)
Version 2 : Received: 11 September 2018 / Approved: 11 September 2018 / Online: 11 September 2018 (09:03:57 CEST)

A peer-reviewed article of this Preprint also exists.

Kent, D.; Rahman Rashid, R.; Bermingham, M.; Attar, H.; Sun, S.; Dargusch, M. Insights into Machining of a β Titanium Biomedical Alloy from Chip Microstructures. Metals 2018, 8, 710. Kent, D.; Rahman Rashid, R.; Bermingham, M.; Attar, H.; Sun, S.; Dargusch, M. Insights into Machining of a β Titanium Biomedical Alloy from Chip Microstructures. Metals 2018, 8, 710.

Journal reference: Metals 2018, 8, 710
DOI: 10.3390/met8090710

Abstract

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 have 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.

Subject Areas

machining, titanium, temperature, strain, grain refinement, ultrafine, nanocrystalline

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