Abstract
Ti-5Mo-5V-5Al-3Cr (Ti-5553) is a deep-hardenable titanium alloy of commercial importance as a viable replacement for Ti-6Alβ4V, Ti-10Al-2V-3Fe and some high strength steels in a variety of aerospace applications. Ti-5553 offers significantly improved thick section hardenability in a product capable of being extruded, rolled, forged, and/or cast. In addition, Ti-5553 can be heat treated in several ways to achieve high strength, high fracture toughness, high fatigue resistance, or a reasonable balance of properties. Production experience has indicated hydrogen content strongly influences the fracture toughness, a critical aerospace design parameter, at all levels below typical specification limits for titanium alloys. Positive identification of hydrogen as a prominent factor in fracture toughness control could have an impact in alloy specification limits, heat-treatment requirements, additional processing, and new alloy grades, all of which could lead to significant cost and/or value added for low hydrogen content material. Multiple characterization tools, including light microscopy, SEM fractography, and TEM, were employed to explore the effects of hydrogen on the microstructure of Ti-5553 and the resulting fracture toughness. Much reduced hydrogen content, within common material specification limits, appears have a strong effect on the fracture toughness of Ti-5553. While not unique to Ti-5553, it is an important dependence to understand in terms of property control. Changes in fracture toughness appear to correlate with the amount of boundary fracture, although the exact mechanism for how hydrogen modifies boundary fracture behavior is not understood, and merits additional study.
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References
B. A. Kolachev, βHydrogen Embrittlement of Titanium and Its Alloys,β Titanium and Titanium Alloys: Scientific and Technological Aspects, Vol. 1, eds. J.C. Williams and A.F. Belov, (New York, NY: Plenum Press and AIME), (1976), 781β790.
B.A. Kolachev, A.V. Fishgoit and V.A. Grinberg, βInfluence of Hydrogen on Fracture Toughness and Subcritical Crack Development in Ξ± + Ξ²-Titanium Alloys,β Soviet materials science: a transi, of Fiziko-khimicheskaya mekhanika materialov, 19 (3) (1983), 173β177.
J.P. Lucas, βHydrogen Effects on Fracture Toughness of TU-6Alβ4V,β Hydrogen Effects on Material Behavior, eds. N.R. Moody and A.W. Thompson, (Warrendale, PA: The Minerals. Metals & Materials Society, 1990), 871β880.
N.R. Moody and J.E. Costa, βA Review of Microstructure Effects on Hydrogen-Induced Sustained Load Cracking in Structural Titanium Alloys,β Microstructure/Property Relationships in Titanium Aluminides and Alloys, eds. Y-W. Kim and R.R. Boyer, (Warrendale, PA: The Minerals. Metals & Materials Society, 1991), 587β604.
M.A. Durfee, βPreventing Degradation and Predicting Response in Fracture Toughness of Ti-6Alβ4V Fan Disks Using Hydrogen Measurements,β Hydrogen Effects in Materials, eds. A.W. Thompson and N.R. Moody, (Warrendale, PA: The Minerals. Metals & Materials Society, 1996), 1039β1047.
H. Hoeg, B. Hollund and I.W. Hall, βEffect of Hydrogen on the Fracture Properties and Microstructure of TU-6Alβ4V,β Metals Science, Feb (1980), 50β56.
C.C. Chen and J.E. Coyn, βHydrogen and Section-Size Dependence of Fracture Toughness for TU-6Alβ4V Alloy Forgings,β Proc. International Conf. on Titanium and Titanium Alloys, eds. J.C. Williams and A.F. Belov, (New York, NY: Plenum Press), (1982), 811β824.
D.A. Meyn, βEffect of Hydrogen on Fracture and Inert-Environment Sustained Load Cracking Resistance of Ξ±-Ξ² Titanium Alloys,β Metall. Trans. A , 5(1974), 2405β2414.
R.D. Briggs, US Patent #20100269958 Al, βTough, High-Strength Titanium Alloys; Methods of Heat Treating Titanium Alloys,β published October 28, 2010.
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Cotton, J.D., Hellenbrand, P.J., Bryan, D.J., Bayha, T.D., Leder, M., Levin, I. (2014). The Effect of Hydrogen on the Fracture Toughness of Ti-5Mo-5V-5Al-3Cr. In: TMS 2014: 143rd Annual Meeting & Exhibition. Springer, Cham. https://doi.org/10.1007/978-3-319-48237-8_10
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DOI: https://doi.org/10.1007/978-3-319-48237-8_10
Publisher Name: Springer, Cham
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