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).
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.
|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
|Date Deposited:||15 Mar 2006|
|Last Modified:||06 Aug 2015 02:20|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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