The machinability of a gamma titanium aluminide intermetallic

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Hood_10_PhD.pdf

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http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/40463 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/40463 http://eprints.org/relation/isIndexCodesVersionOf http://etheses.bham.ac.uk/id/document/40463 archive 4031 disk0/00/00/13/80 2011-02-28 13:09:41 2019-01-23 09:54:03 2013-09-17 13:58:17 thesis show 0 Hood Richard Aspinwall David K. University of Birmingham The machinability of a gamma titanium aluminide intermetallic unpub TJ 10col_ephy Full embargo until 31 July 2014 Option 'D' Paul Bowen No request for a further option. The work reported details the machinability of the gamma titanium aluminide intermetallic (-TiAl) Ti-45Al-8Nb-0.2C currently under evaluation to be the material of choice for blades and stators in the intermediate compressor (IP) and low pressure (LP) turbine sections of an aeroengine due to the alloys high temperature (~800C) and low weight properties. Following a literature review, the thesis details the results from two phases of experimental work. The first focused on high speed milling trials using coated tungsten carbide ball nose end mills with various operating parameters whilst the second phase provided an assessment of intermittent dress creep feed grinding using both conventional (SiC) and superabrasive (diamond and CBN) wheels with free jet nozzles. Benchmarking of the -TiAl alloy against other -TiAl (Ti-45Al-2Mn-2Nb +0.8%vol. TiB2), burn resistant and conventional titanium (Ti-6Al-4V) alloys was also performed. Full and fractional factorial (Taguchi) experimental designs were employed to identify the effect of key operating factors and levels on output measures (tool life/wheel wear, forces, power, and workpiece surface roughness). Taguchi main effect plots are detailed, together with Analysis of Variance (ANOVA) data and percentage contribution ratio (PCR) values. In addition, workpiece surface integrity evaluation including assessment of microstructure and microhardness is also presented.. 2010-07 2010-06 graduation eng author This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. Element Six ISCAR Tools Ltd. Rolls-Royce Saint-Gobain public 318 University of Birmingham School of Engineering, Department of Mechanical Engineering d_ph epsrc 2010-07 graduation