Abstract
The role of cobalt in a representative wrought nickel-base superalloy was recently determined. The results show cobalt affecting the solubility of elements in the γ matrix, resulting in enhanced γ’ volume fraction, in the stabilization of MC-type carbides, and in the stabilization of sigma phase. In the particular alloy studied, these microstructural and microchemistry changes are insufficient in extent to impact on tensile strength, yield strength, and in the ductilities. Depending on the heat treatment, creep and stress rupture resistance can be cobalt sensitive. In the coarse grain, fully solutioned and aged condition, all of the alloy’s 17% cobalt can be replaced by nickel without deleteriously affecting this resistance. In the fine grain, partially solutioned and aged condition, this resistance is deleteriously affected only when one-half or more of the initial cobalt content is removed. The structure and property results are discussed with respect to existing theories and with respect to other recent and earlier findings on the impact of cobalt, if any, on the performance of nickel-base superalloys.
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References
J.K. Tien, T.E. Howson, G.L. Chen and X.S. Xie: 1980, Journal of Metals, Vol. 32, No. 10, pp. 12–20.
R.N. Jarrett and J.K. Tien: 1982, Met. Trans. A, Vol. 13A, No. 6, pp. 1021–1032.
M.V. Nathal and R.D. Maier: 1981, NASA Report No. NASA CR- 165384, pp. 104.
G.E. Maurer, L.A. Jackman and J.A. Domingue: 1980, “Superalloys 1980,” ed. J.K. Tien et al., pp. 43–52.
O.H. Kriege and J.M. Baris: 1969, Trans. ASM, Vol. 62, pp. 195–200.
R.W. Guard and J.H. Westbrook: 1959, Trans. Met. Soc. AIME, Vol. 215, pp. 807–814.
C.H. Lund, M.J. Woulds and J. Hockin: 1968, “Structural Stability in Superalloys,” ed. by Joint Committees of ASTM, ASME, ASM and AIME, pp. 25–46.
E.H. Van der Molen, J.M. Oblak and O.H. Kriege: 1971, Met. Trans., Vol. 2, No. 6, pp. 1627–1633.
J. Heslop: Sept. 1964, Cobalt, Vol. 24, pp. 128–137.
J. Schramm: Dec. 1941, Z. Metallkunde, Vol. 33, pp. 403–409.
C.K.L. Davies, P. Nash, R.N. Stevens: 1980, J. Mat. Sci., Vol. 15, pp. 1521–1532.
A. Taylor: Oct. 1956, Trans. AIME, Vol. 206, pp. 1356.
V. Ya. Markiv, V.V. Burnashova, L.I. Pryakhina and K.P. Myasnikova: 1969, Iz. Ak. Nauk SSSR, Met., No. 5, pp. 180–185.
W. Peter and H. Miiller: 1965, Archiv fur das Eisenhiittenwesen, Vol. 36, No. 11, pp. 835–841.
W.J. Boesch and H.B. Canada: Apr. 1968, Journal of Metals, Vol. 20, No. 4, pp. 46–50.
L.R. Woodyatt, C.T. Sims and H.J. Beattie, Jr.: Apr. 1966, Trans. Met. Soc. AIME, Vol. 236, pp. 519.
S.P. Rideout and P.A. Beck: 1953 NACA Report No. 1122.
W.J. Boesch and J.S. Slaney: July 1964 Metal Progress, Vol. 86, No. 1, pp. 109–111.
J.R. Mihalisin, C.G. Bieber and R.T. Grant: Dec. 1968, Trans. AIME, Vol. 242, pp. 2399–2414.
F. Cosandey, T.J.T. Tang, C. Cheng, R.N. Jarrett and J.K. Tien, “The Effects of Cobalt on γ’ Coarsening Kinetics and Microchemistry in Udimet 700,” to be published.
C.R. Barrett and O.D. Sherby: 1965, Trans. Met. Soc. AIME, Vol. 233, pp. 1116–1119.
X.S. Xie, G.L. Chen, P.J. McHugh and J.K. Tien: May 1982, ScriptaMet., Vol. 16, pp. 483–488.
B.E.P. Beeston, I.L. Dillamore and R.E. Smallman: 1968, J. Met. Sci., Vol. 2, pp. 12–14.
B.E.P. Beeston and L.K. France: 1968, J. Inst. Metals, Vol. 96, pp. 105–107.
L.M. Brown and R.K. Ham: 1971, “Strengthening Mechanisms in Crystals,” ed. A. Kelly and R.B. Nicholson, pp. 12–135.
N.F. Lashko, O.A. Khromova, A.A. Burmistrova and N.I. Zhuravleva: 1970, “Structure and Properties of Heat-Resistant Metals and Alloys,” ed. M.V. Pridantsev, pp. 200–204.
V. Lupine and T.B. Gibbons: 1978, “High Temperature Alloys for Gas Turbines,” ed. D. Coutsouradis et al., pp. 335–358.
J.J. Jackson, M.J. Donachie, R.J. Henricks and M. Gell: 1977, Met. Trans. A, Vol. 8A, pp. 1615–1620.
R. Watanabe and T. Kuno: 1976, Trans. Iron and Steel Inst. Jap., Vol. 16, pp. 437–446.
J. Heslop: 1962/1963, J. Inst, of Metals, Vol. 91, pp. 28–33.
A.M. Borzdyka: Nov-Dec. 1977, Metal Science and Heat Treatment, Vol. 19, pp. 937–939.
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Tien, J.K., Jarrett, R.N. (1982). Effects of Cobalt in Nickel-Base Superalloys. In: Brunetaud, R., Coutsouradis, D., Gibbons, T.B., Lindblom, Y., Meadowcroft, D.B., Stickler, R. (eds) High Temperature Alloys for Gas Turbines 1982. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7907-9_17
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