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http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/2643 http://eprints.org/relation/ispreviewThumbnailVersionOf http://etheses.bham.ac.uk/id/document/2643 http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/2643 archive 4031 disk0/00/00/10/62 2010-11-17 13:10:52 2019-01-23 09:53:25 2011-07-19 16:28:33 thesis show 0 Daus Friedrich Herbert Bowen Paul Li Hang Yue University of Birmingham unpub TJ TN 10col_ephy Inertia Friction Welding Nickel Base Superalloy Thesis embargoed until: 31/12/2020 The objective of this research was to study the difference in microstructure and high temperature fatigue behaviour between three RR1000 to IN718 inertia friction welds and to provide further understanding of the inertia friction welding process. Between the three welds no significant differences in the weld microstructures were found. Also high temperature fatigue crack growth tests within 0.3 mm of the weld interface, showed no difference in crack growth rate due to the three different sets of welding parameters. The cracks were found to propagate from RR1000 through the weld interface into IN718 passing a 10-30 mm wide zone, allowing higher crack growth rates. Fractographic studies have shown that these higher crack growth rates are caused by a higher tendency to intergranular cracking. In the present welds a semi-solid weld contact layer of 10 - 30 mm thickness developed, being an intermediate alloy of varying composition of the two base materials. In the surrounding material constitutional liquation of NbC particles in IN718 and of primary γ′ in RR1000 occurred. Similar welding process characteristics during the final second of the three welding cycles resulted in the observed similar weld microstructure and high temperature fatigue properties. It was further found that the local fatigue crack growth rate increase occurs in the weld contact layer. 2010-12 2010-08 graduation eng author This unpublished thesis/dissertation is copyright of the author and/or third parties.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. restricted 422 University of Birmingham School of Metallurgy and Materials d_ph epsrc 2010-12 graduation