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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References
A. E. Marsh andT. Marrison, in the Proceedings of “Forging and Properties of Aerospace Materials”, Leeds (1977) (The Metals Society, London, 1978) p. 308.
G. J. Lewis, D. M. Parkin andF. A. Thompson,ibid, p. 390.
C. A. Morris andJ. W. Smythe, “Superalloys — Processing”. Proceedings of the 2nd International Conference, Seven Springs, Penn. (1972). IMD High Temperature Alloys Committee of TMS-AIME.
P. J. Postans andR. H. Jeal, in the Proceedings of “Forging and Properties of Aerospace Materials”, Leeds (1977), (The Metals Society, London, 1978) p. 300.
D. L. Williams,Powder Met. 2 (1977) 84.
J. V. Bee, University of Cambridge (1977) unpublished research.
L. Winberg andM. Dahlen J. Mater. Sci. 13 (1978) 2365.
P. A. Beck andP. R. Sperry,J Appl. Phys. 21 (1950) 150.
J. E. Bailey andP. B. Hirsch,Proc. Roy. Soc. 267A (1962) 11.
A. R. Jones, B. Ralph andN. Hansen,Proc. Roy. Soc. (in press).
J. C. M. Li,J. Appl. Phys. 33 (1962) 2958.
D. Griffiths andJ. N. Riley,Acta Met. 14 (1964) 755.
A. W. Thompson, in Proceedings of 4th International Conference on the Strength of Metals and Alloys, Nancy, Vol. 1 (1976) p. 405, Edited by Laboratoire de Physique du Solide — E.N.S.M.I.M. I.N.P.L., Nancy, France.
P. R. Howell, J. P. Nilsson andG. L. Dunlop,Phil. Mag 38 (1978) 39.
R. D. Doherty andR. W. Cahn,J. Less Common Met. 28 (1972) 279.
C. Zener, private communication to C. S. Smith,Trans. AIME 175 (1948) 15.
T. Gladman,Proc. Roy. Soc. 294A (1966) 298.
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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/BF02396781
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DOI: https://doi.org/10.1007/BF02396781