The Homogenisation of Single-Crystal Superalloys

G. S. Hillier and H. K. D. H. Bhadeshia


The homogenisation of nickel-base superalloys is best carried out at a temperature within the gamma phase field, provided that the alloy does not undergo incipient melting before the gamma' solvus is reached. The temperature range between the gamma' solvus and the solidus of the inhomogeneous alloy is called the "heat-treatment window". This work is an investigation of the factors determining the heat-treatment window, as a function of alloy composition for a range of single crystal superalloys. The homogenisation behaviour is followed using various microanalysis techniques.

It is found that the heat-treatment window variations can be qualitatively understood in terms of the effect of Ti on the solidus temperature of superalloys and in terms of its ability to increase the amount of gamma/gamma' eutectic obtained in as-cast single crystal superalloys. Some clear trends in the segregation behaviour of various alloying elements are also established and discussed.

Proceedings of the Sheffield Centenary Conference on Perspectives
in Metallurgical Development,

The Metals Society, London, 1984, pp. 183-187.

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