Abstract
The influence of microstructure on the thermal fatigue (TF) behavior of MAR-M 509, a cast cobalt-base superalloy, was investigated using a burner rig and wedge-type specimens which were submitted to thermal shock from 200 °C to 1100 °C. Two microstructures were studied: a coarse microstructure using specimens machined from bulk castings and a fine microstructure using cast-to-size specimens. Metallographic observations showed that cast-to-size specimens display a gradient in microstructure since the size of secondary dendrites increases with the distance to the thin edge. As high-temperature fatigue in this superalloy is controlled by oxidation-fatigue interactions, the kinetics of interdendritic oxidation was studied at 900 °C. Interdendritic oxidation was found to be inhibited by a refinement of dendritic microstructure. A fine microstructure was shown to give a much longer TF life-to-crack initiation and a much lower crack growth rate. This behavior was mainly related to differences in interdendritic oxidation since interdendritic areas act as crack initiation sites as well as easy crack propagation paths. The influence of microstructure on crack growth rates was accounted for by using a previously proposed oxidation-fatigue crack growth model and interdendritic oxidation kinetic data.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
E. Glenny, J.E. Northwood, S.W.K. Shaw, and T.A. Taylor:J. Inst. Met., 1958-59, vol. 87, pp. 294–302.
E. Glenny and T.A. Taylor:J. Inst. Met., 1959–60, vol. 88, pp. 449–61.
E. Glenny: inThermal and High Strain Fatigue, Institute of Metals, Iron Steel Institute, London, 1967, pp. 346–63.
P.T. Bizon and D. A. Spera: inThermal Fatigue of Materials and Components, ASTM STP 612, D.A. Spera and D.F. Mowbray, eds., ASTM, Philadelphia, PA, 1976, pp. 106–22.
F. Rezai-Aria, L. Rémy, C. Herman, and B. Dambrine:Mechanical Behaviour of Solids IV, J. Carlson and M.G. Ohlson, eds., Pergamon Press, Oxford, 1983, vol. 1, pp. 247–53.
D.A. Spera:Calculations of Thermal Fatigue Life Based on Accumulated Creep Damage, NASA TND-5589, National Aeronautics and Space Administration, Washington, DC, 1969.
D.A. Spera: inFatigue at Elevated Temperatures, ASTM STP 520, ASTM, Philadelphia, PA, 1972, pp. 648–57.
C.T. Sims and W.C. Hagel:The Superalloys, Wiley, New York, NY, 1972, p. 14, p. 403.
D.A. Woodford and D.F. Mowbray:Mater. Sei. Eng., 1974, vol. 16, pp. 5–43.
F. Rezai-Aria, M. François, and L. Rémy:Fatigue Fract. Eng. Mater. Struct., 1988, vol. 11, pp. 277–89.
F. Rezai-Aria, B. Dambrine, and L. Rémy:Fatigue Fract. Eng. Mater. Struct., 1988, vol. 11, pp. 291–302.
J. Reuchet and L. Rémy:Mater. Sei. Eng., 1983, vol. 58, pp. 19-32 and 33–42.
L. Rémy, F. Rezai-Aria, R. Danzer, and W. Hoffeiner: inLow Cycle Fatigue, ASTM STP 942, H.D. Solomon, G.R. Haiford, L.R. Kaisand, and B.N. Leis, eds., ASTM, Philadelphia, PA, 1988, pp. 1115–32.
F. Rezai-Aria and L. Rémy:Proc. Int. Spring Meeting, Fatigue Committee of the Société Francaise de Métallurgie, Paris, June 9–11, 1986, pp. 290–301.
F. Rezai-Aria and L. Rémy:Eng. Fract. Mech., 1989, vol. 34, pp. 283–94.
J. Reuchet and L. Rémy:Metall. Trans. A, 1983, vol. 14A, pp. 141–49.
J. Reuchet and L. Rémy: Centre des Matériaux, Ecole des Mines de Paris, unpublished research, 1980.
J.C. Fischer:J. Appl. Phys., 1951, vol. 22, p. 74.
L. Rémy, M. François, and M. Reger: Centre des Matériaux, Ecole des Mines de Paris, unpublished research, 1983.
J.M. Drapier, V. Leroy, C. Dupont, D. Coutsouradis, and L. Habraken:Cobalt, 1968, vol. 41, pp. 199–213.
R. Fernandez, J.C. Lecomte, and T.Z. Kattamis:Metall. Trans. A, 1978, vol. 9A, pp. 1381–86.
M. Reger and L. Rémy:Metall. Trans. A, 1988, vol. 19A, pp. 2259–68.
M. François:Rôle de l'oxydation dans l' endommagement en fatigue thermique de l'alliage MAR-M 509, Mémoire CNAM, Paris, 1989.
J.C. Grosskreutz:Phys. Status Solidi B, 1971, vol. 47, pp. 11–31.
C.G. Beck and A.T. Santhanam: inThermal Fatigue of Materials and Components, ASTM STP 612, D.A. Spera and D.F. Mowbray, eds., ASTM, Philadelphia, PA, 1976, pp. 123–40.
C.W. Brown, J.E. King, and M.A. Hicks:Met. Sei., 1984, vol. 18, pp. 374–80.
Author information
Authors and Affiliations
Additional information
Formerly with the Centre des Matériaux, Ecole des Mines de Paris
Rights and permissions
About this article
Cite this article
François, M., Rémy, L. Influence of microstructure on the thermal fatigue behavior of a cast cobalt-base superalloy. Metall Trans A 21, 949–958 (1990). https://doi.org/10.1007/BF02656579
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02656579