A new and original densification process of nickel-based superalloys consists in forging supersolidus-sintered preforms. From the coarse-grained structure of the material sintered in the presence of a liquid phase, forging at a high deformation ratio can lead to a duplex structure (usually called “necklace” structure) as can be obtained by conventional HIP + forge or cast/wrought routes. Optimal forging conditions to form a “necklace” structure have been determined for Astroloy powders. The restoration and recrystallization mechanisms are described in relation to deformation conditions and heat-treatments. Structures and related mechanical behaviour have been characterized. The “necklace” material compares well with conventional direct “HIPed” or forged materials. Good creep-rupture properties are due to large warm-worked grains, and a high resistance to crack initiation and propagation results from recrystallized grains of the duplex structure.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
M. Jeandin, B. Fieux andJ. P. Trottier, Proceedings of the 1980 International Powder Metallurgy Conference, Modern Developments in Powder Metallurgy, edited by H. H. Hausner, Vol. 14 (MPIF/APMI, Princeton, 1981) p. 65.
M. Jeandin, Thèse de Docteur-Ingénieur, Ecole des Mines de Paris (1981).
C. H. Symonds andF. A. Thompson, Proceedings of the 42nd Meeting of the AGARD Structures and Materials Panel, AGARD, no. 200 (1976) P3–1.
C. E. Shamblen, R. E. Allen andF. E. Walker,Met. Trans. 6A (1975) 2073.
J. E. Coyne, W. H. Couts, C. C. Chen andR. P. Roehm, Proceedings of the 1980 Powder Metallurgy and Superalloys, Metal Powder Report, Vol. 1 (MPR Publishing Services Ltd., Shrewsbury, 1980) p. 11.
J. E. Coyne andW. H. Couts,Mat. Tech. 4–5 (1973) 147.
D. L. Williams,Powder Met. 20 (1977) 84.
S. Dermarkar, Thèse de Docteur-Ingénieur, Ecole des Mines de Paris (1980).
J. M. Oblak andW. A. Owczarski,Met. Trans. 3 (1972) 617.
M. Dahlen andL. Winberg,Met. Sci. 13 (1979) 163.
J. V. Bee, A. R. Jones andP. R. Powell, Proceedings of the first Risø International Symposium, edited by N. Hansen (Risø National Laboratory, Roskilde, 1980) p. 153.
C. H. Symonds, J. W. Eggar, G. J. Lewis andR. J. Siddall, Proceedings of the 1980 Powder Metallurgy Superalloys, Metal Powder Report, Vol. 1 (MPR Publishing Services Ltd., Shrewsbury, 1980) p. 17.
P. Lescop, M. Marty andA. Walder, Proceedings of the 42nd Meeting of the AGARD Structures and Materials Panel, AGARD, no. 200 (1976) P8–1.
G. Aubin, Thèse de Docteur-Ingénieur, Ecole des Mines de Paris (1981).
M. Clavel, C. Levaillant andA. Pineau, Proceedings of the AIME Fall Meeting, edited by R. M. Pelloux (Metal Society of AIME, 1980), p. 24.
About this article
Cite this article
Jeandin, M. Necklace structure obtained by forging Astroloy supersolidus-sintered preforms. J Mater Sci 17, 2902–2910 (1982). https://doi.org/10.1007/BF00644668
- Liquid Phase
- Mechanical Behaviour
- Crack Initiation