Abstract
The effect of microstructure on the notch fatigue properties of Ti-6A1-4V was investigated. Specimens with five distinctly different microstructures were tested and subsequently examined in detail. It was found that the notch fatigue performance of the alloy varied significantly as the microstructure was altered by heat treatment. The best high cycle fatigue strength was found in specimens heat treated above the beta transus temperature, containing an almost totally transformed acicular alpha structure. The fatigue performance of specimens with this microstructure appeared to be controlled by the size of the nucleated crack. It is suggested that at low stress levels the nucleated crack is limited in size to the width of a single alpha needle, while at high stresses the nucleated crack may be as large as an entire colony of similarly aligned alpha needles.
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References
A. M. Freudenthal:Eng. Fract. Mech., 1973, vol. 5, pp. 403–14.
J. A. Hall, C. M. Pierce, D. L. Ruckle, and R. A. Sprague:Mater. Sci. Eng., 1972, vol. 9, pp. 197–210.
A. W. Bowen and C. A. Stubbington:Titanium Science and Technology, vol. 3, pp. 2097–108, Plenum Press, New York, 1973.
C. A. Stubbington and A. W. Bowen:Titanium Science and Technology, vol. 2, pp. 1288–96, Plenum Press, New York, 1973.
C. A. Stubbington and A. W. Bowen:RAE Tech. Report 73036, Royal Aircraft Establishment, Farnborough, England, May 1973.
J. J. Lucas:Titanium Science and Technology, vol. 3, pp. 2081–95, Plenum Press, New York, 1973.
J. J. Lucas and P. P. Konieczny:Met. Trans., 1971, vol. 2, pp. 911–12.
H. Margolin, S. Patel, and Y. Mahajan: Final report on Contract Nr. N00024-72-C-5465, Naval Ship Systems Command, January 1974.
W. J. Crichlow:Titanium Science and Technology, vol. 2, pp. 1257–70, Plenum Press, New York, 1973.
W. J. Crichlow: AGARD Lecture Series No. 62 on “Fatigue Life Prediction for Aircraft Structures and Materials,” Munich, Paris, and Ottawa, June 1973.
I. C. Whittaker:Report No. AFML-TR-72-236, Air Force Materials Laboratory, October 1972.
I. C. Whittaker and I. C. Beanner:Report No. AFML-TR-69-65, Air Force Materials Laboratory, April 1969.
J. E. Reynolds, H. R. Ogden, and R. I. Jaffee:Trans. ASM, 1957, vol. 49, pp. 280–99.
P. L. Hendricks:AIAA/ASME/SAE 15th Structures, Structural Dynamics and Materials Conference, Las Vegas, Nev., April 1974, Paper No. 74-374.
ASTM STP 91, Manual on Fatigue Testing, pp. 60–61, ASTM, Philadelphia, 1949.
A. Zarkades and F. R. Larson: “Properties of Textured Titanium Alloys,” Metals and Ceramics Information Center Report, MCIC-74-20, July 1974.
P. G. Partridge:Phil Mag., 1965, series 8, vol. 12, pp. 1043–54.
C. T. Beevers:The Science, Technology and Application of Titanium, pp. 535–45, Pergamon Press, Oxford, 1970.
A. Zarkades and F. R. Larson: Army Materials and Mechanics Research Center, AMMRC TN, 1973.
D. Eylon, C. M. Pierce, and J. A. Hall: “The Low Cycle Fatigue Behavior of IMI-685 Titanium Alloy,” AFML, unpublished work.
D. Eylon, C. M. Pierce, and J. A. Hall: “The Correlation of Microstructure and Mechanical Properties in the Ti-11 Alloy at Room and Elevated Temperature,” MATCON 74 Materials Science Symposium, Detroit, Mich., October 1974, abstract book, paper No. 150.
D. Shechtman and J. A. Robertson: “Localized Shear Related Fracture in the Ti-6Al-2Sn-4Zr-2Mo Alloy,” Workshop on the Effect of Plastic Instability on the Fatigue and Fracture of Two-Phase Materials, Fairborn, Ohio, September 1974.
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Eylon, D., Pierce, C.M. Effect of microstructure on notch fatigue properties of Ti-6Al-4V. Metall Trans A 7, 111–121 (1976). https://doi.org/10.1007/BF02644046
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DOI: https://doi.org/10.1007/BF02644046