Fracture and Fatigue of the Inertia Welded Titanium Alloy Ti-6Al-2Sn-4Zr-6Mo

1284 39 40799 5 94968 document 40799 Miles11MRes_Optimised.pdf application/pdf 153e5e128795367fe2bd8eb8364174b0 MD5 14302678 2015-01-30 11:57:42 http://etheses.bham.ac.uk//id/eprint/1284/1/Miles11MRes_Optimised.pdf 1284 1 1 application/pdf application/pdf en staffonly

Miles11MRes_Optimised.pdf

2030-02-01 accepted http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/42479 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/42479 http://eprints.org/relation/hassmallThumbnailVersion http://etheses.bham.ac.uk/id/document/42479 http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/42480 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/42480 http://eprints.org/relation/haspreviewThumbnailVersion http://etheses.bham.ac.uk/id/document/42480 http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/42481 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/42481 http://eprints.org/relation/hasIndexCodesVersion http://etheses.bham.ac.uk/id/document/42481 42479 2 99761 document 42479 small.png image/png f3cc7cede42211e37cfd04d8cbb679e9 MD5 4898 2015-04-28 21:04:36 http://etheses.bham.ac.uk//id/eprint/1284/2/small.png 1284 2 2 image/png thumbnail_small Thumbnail Documents conversion from application/pdf to thumbnail_small en staffonly

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http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/40799 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/40799 http://eprints.org/relation/isIndexCodesVersionOf http://etheses.bham.ac.uk/id/document/40799 archive 3210 disk0/00/00/12/84 2015-02-27 09:26:21 2019-01-23 09:53:51 2015-02-27 09:26:21 thesis show 0 Miles Christopher James Bowen Paul bowenp@adf.bham.ac.uk 684273 University of Birmingham Fracture and Fatigue of the Inertia Welded Titanium Alloy Ti-6Al-2Sn-4Zr-6Mo unpub TN 10col_ephy Old embargo - embargo expired 1st Feb 2015 As thesis concerns Rolls Royce option C for 15 years default applied (until Feb 2030). In this thesis the microstructure, microhardness, and mechanical properties of the α/β alloy Ti-6Al-2Sn-4Zr-6Mo inertia welded to itself using a variety of parameters were assessed. The resultant welds were compared to the parent in both the as-welded and post weld heat treated condition (640°C / 2 hours). The mechanical properties of later welds were evaluated at three different temperatures and R ratios. Welding at process parameters within a defined window has produced welds with satisfactory mechanical properties. These welds are harder than the parent in both the as welded and Post Weld Heat Treated (PWHT) conditions. Post Weld Heat Treating of these welds at 640°C for two hours results in the re-precipitation of secondary α throughout the Central Weld Zone and Heat Affected Zone, leading to a local microhardness increase. The weld is deduced to be more resistant to fatigue crack initiation than the parent material, with all low cycle fatigue samples failing in the parent. The fatigue crack growth resistance of welded and parent samples was comparable at all temperatures tested, with no effects of dwell observed. However, a static (intergranular) mode of failure at room temperature caused rapid acceleration of crack growth at higher ∆K values as the peak value of K approaches the fracture toughness. Hence, the onset of final failure in fatigue crack growth tests is strongly dependent on the R ratio, but at lower ∆K values, crack growth rates are independent of R ratio. 2011-07 2011-01 graduation eng author checked 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. Christopher James Miles restricted University of Birmingham School of Metallurgy and Materials m_rs na 2011-07 graduation