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Subcritical crack growth in two titanium alloys

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Abstract

Measurement of subcritical crack growth during static loading of precracked titanium alloys in salt water using samples too thin for plane strain loading to predominate was examined as a method for determiningKIscc, the critical stress intensity for crack propagation in salt water. Significant internal crack growth followed by arrest was found at quite low stress intensities, but crack growth rates were relatively low. Assuming these techniques provided a reliable measurement ofKIscc, the value for annealed Ti-4Al-1.5Mo-0.5V alloy was apparently about 35 ksi-in.1/2, while that for annealed Ti-4Al-3Mo-lV was below 45 ksi-in.1/2. Crack growth was also observed in tests conducted in both alloys in an air environment. At 65 ksi-in.1/2, the extent of crack growth was greater in air than in salt water. Ti-4Al-3Mo-lV showed arrested crack growth in air at a stress intensity of 45 ksi-in.1/2.

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  1. Battelle Memorial Institute, 43201, Columbus, Ohio

    D. N. Williams (Technical Advisor)

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  1. D. N. Williams
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Williams, D.N. Subcritical crack growth in two titanium alloys. Metall Trans 4, 675–680 (1973). https://doi.org/10.1007/BF02643074

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  • DOI: https://doi.org/10.1007/BF02643074

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