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

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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 γ′ precipitates in the dendrites and coarsening of γ′ 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 γ′ precipitates.

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Authors and Affiliations

  1. Institute of Polymer Technology and Materials Engineering, Loughborough University, Loughborough, LE11 3TU, UK

    M. J. Starink & R. C. Thomson

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  1. M. J. Starink
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  2. R. C. Thomson
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Starink, M.J., Thomson, R.C. The effect of high temperature exposure on dendritic segregation in a conventionally cast Ni based superalloy. Journal of Materials Science 36, 5603–5608 (2001). https://doi.org/10.1023/A:1012513615622

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