Abstract
This paper describes the nucleation and propagation of recrystallization in a powder-produced nickel-base superalloy. It is shown that recrystallization is initiated by a sub-grain coalescence mechanism, on coarse γ′ precipitates associated with pre-existing grain boundaries, leading to the formation of the so-called “necklace” structure. No intragranular nucleation of recrystallization is observed, owing to the inherent stability of the recovered matrix regions. It is also shown that the networks of MC-type carbides which often delineate the prior-particle boundaries do not radically affect the recrystallization process.
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Bee, J.V., Jones, A.R. & Howell, P.R. The development of the “necklace” structure in a powder-produced nickel-base superalloy. J Mater Sci 15, 337–344 (1980). https://doi.org/10.1007/PL00020066
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DOI: https://doi.org/10.1007/PL00020066