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), 5603-5608. (doi:10.1023/A:1012513615622).

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Original Publication URL: http://dx.doi.org/10.1023/A:1012513615622

Description/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.

Item Type: Article
ISSNs: 0022-2461 (print)
Related URLs:
Keywords: spuperalloy, dendrite, segregation, casting, EDS, SEM, diffusion, solutionising, exposure, gamma phase, carbide, MC
Subjects: T Technology > TN Mining engineering. Metallurgy
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 21742
Date Deposited: 15 Mar 2006
Last Modified: 27 Mar 2014 18:11
URI: http://eprints.soton.ac.uk/id/eprint/21742

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