Abstract
To establish correlations between microstructure and mechanical properties for the Till alloy, twelve different combinations of hot die forging and heat treatment, in the α+β and β phase regions, were investigated. The resulting heat treated forgings were classified into four distinct categories based on their microstructural appearance. The room temperature tensile, post-creep tensile, fracture toughness and fatigue crack propagation properties were measured along with creep and low cycle fatigue at 566°C. The creep, tensile, fatigue crack propagation and fracture toughness properties, grouped in a manner similar to the microstructural categories. The fracture appearance and behavior of the cracks during propagation in fatigue and in fracture toughness tests were examined, and correlations with the microstructure discussed. In the case of the fully transformed acicular microstructure, it was found that the size and the orientation of colonies of similarly aligned α needles are dominant factors in the crack behavior.
Similar content being viewed by others
References
J. A. Hall, C. M. Pierce, D. L. Ruckle, and R. A. Sprague:Mater. Sci. Eng., 1972, vol. 9, pp. 197–210.
M. S. Greenfield, C. M. Pierce, and J. A. Hall:Titanium Science and Technology, vol. 3, pp. 1731–1943, Plenum Press, New York, 1973.
R. I. Jaffee:Titanium Scienceand Technology, vol. 3, pp. 1665–93, Plenum Press, New York, 1973.
W. M. Parris and H. A. Russell:Titanium Science and Technology, vol. 4, pp. 2219–25, Plenum Press, New York, 1973.
C. C. Chen, W. H. Couts, C. T. Gure, and S. C. Jain: AFML-TR-128-4, Air Force Materials Laboratory Technical Report, 1975.
C. C. Chen, J. E. Coyne, and R. D. Sparks: “7th Annual TMS-AIME Meeting,”Abstract Book, p. 38, Toronto, May 1975.
D. Eylon, C. M. Pierce, and J. A. Hall:Met. Eng. Quart., 1976, vol. 16, no. 1, pp. 33–40
D.L. Ruckle and R. A. Sprague: Unpublished research, Pratt and Whitney Aircraft, East Hartford, Conn.
D. Eylon:Microscope, 1975, vol. 23, pp. 133–37.
T. M. F. Ronald, J. A. Hall, and C. M. Pierce:Met. Trans., 1972, vol. 3, pp. 813–18.
W. F. Brown and J. E. Srawley: ASTM STP 410, p. 11, ASTM publication, Philadelphia, Penn., 1969.
C. G. Rhodes and J. C. Williams:Met. Trans. A, 1975, vol. 6A, pp. 1670–71.
M. A. Greenfield and H. Margolin:Met. Trans., 1972, vol. 3, pp. 2649–59.
D. Eylon, J. A. Hall, and C. M. Pierce:Fatigue Failures in IMI-685 Titanium Alloy with an Acicular Grain Structure, unpublished work.
N. J. Petch:J. Iron Steel Inst., 1953, vol. 173, p. 25.
J. C. Chesnutt, C. G. Rhodes, and J. C. Williams: ASTM STP 600, pp. 99–138, ASTM publication, Philadelphia, Penn., 1976.
G. S. Hall, S. R. Seagle, and H. B. Bomberger:Titanium Science and Technology, vol. 4, pp. 2141–50, Plenum Press, New York, 1973.
G. S. Hall, S. R. Seagle, and H. B. Bomberger: AFML-TR-73-37, Air Force Materials Laboratory Technical Report, April 1973.
T. K. Redden and C. E. Shamblen: AFML-TR-70-168, Air Force Materials Laboratory Technical Report, 1970.
N. E. Paton, M. W. Mahoney, and J. C. Williams: final report SC564.7FR, Naval Air Systems Command Contract N00019-74-C-0052, August 1974.
H. M. Flower, P. R. Swann, and D. R. F. West:Met. Trans., 1971, vol. 2, pp. 3289–97.
D. Eylon and C. M. Pierce:Met. Trans. A, 1976, vol. 7A, pp. 111–21.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Eylon, D., Hall, J.A., Pierce, C.M. et al. Microstructure and mechanical properties relationships in the Ti-11 alloy at room and elevated temperatures. Metall Trans A 7, 1817–1826 (1976). https://doi.org/10.1007/BF02659811
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02659811