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The effect of high temperature exposure on the dendritic segregation in a conventionally cast Ni based superalloy

Starink, M.J. and Thomson, R.C. (2001) The effect of high temperature exposure on the dendritic segregation in a conventionally cast Ni based superalloy Journal of Materials Science, 36, (23), pp. 5603-5608. (doi:10.1023/A:1012513615622).

Record type: Article

Abstract

Dendritic segregation in conventionally cast, commercially heat treated and exposed MarM002 turbine blades has been investigated using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). During casting Cr, Co and W segregate to the dendrites and Hf, Ti and Ta segregate to the eutectics. As a result of the dissolution of precipitates in the dendrites and coarsening of precipitates in the eutectics this segregation aggravates during exposure at 1000°C. At this high exposure temperature homogenisation of dendritic segregation does not occur because it involves long diffusion distances and a low driving force compared with dissolution and coarsening of precipitates.

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Published date: 2001
Keywords: spuperalloy, dendrite, segregation, casting, EDS, SEM, diffusion, solutionising, exposure, gamma phase, carbide, MC

Identifiers

Local EPrints ID: 21742
URI: http://eprints.soton.ac.uk/id/eprint/21742
ISSN: 0022-2461
PURE UUID: d7508ec6-21fa-4738-ad73-6138043c2b04

Catalogue record

Date deposited: 15 Mar 2006
Last modified: 17 Jul 2017 16:25

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Contributors

Author: M.J. Starink
Author: R.C. Thomson

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