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The effect of matrix strength on the fracture resistance of an alpha-Beta titanium alloy, corona-5

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Abstract

This paper presents the results of a study of the effect of matrix yield strength, at constant Widmanstätten α microstructure, on the fracture resistance of an α-β Ti alloy, CORONA-5. Fracture initiation resistance,J q, and the stable crack growth resistance,T, were evaluated by the single specimen, unloading compliance method for four different microstructures and three yield strengths. The microstructures involved coarse or fine Widmanstätten α particles in a heat treated β-matrix; the yield strength ranged from 765 to 1018 MPa. It was found thatJ q/σY, where σY is the effective yield strength, decreased with increasingσ Y.T/σ Y also decreased with increasing σY for fine structures. For the coarse α structures, however, T/σY revealed intermediate maxima. Coarser structures, in general, revealed higher values ofJ q/σY andT/σ Y. The cause was found primarily to be due to the effect of increased α particle thickness. The effect of grain size was secondary. Jq/σY increased with increasing tensile strain hardening rate, obtained at the onset of void nucleation. T/σY was found to decrease with increasing tensile void growth rate. In general, Jq/σY and T/σY revealed different relationships with microstructure. Fatigue precrack front- and the stable crack length-tortuosities did not yield any general relationship to fracture resistance at different yield strengths.

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Authors and Affiliations

  1. Vapor Technologies, Inc., Bradford Road, 10553, Mount Vernon, NY

    K. R. Narendrnath (Analytical Materials Scientist)

  2. Department of Metallurgy and Materials Science, Polytechnic University, 333 Jay Street, 11201, Brooklyn, NY

    H. Margolin (Professor)

Authors
  1. K. R. Narendrnath
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  2. H. Margolin
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Narendrnath, K.R., Margolin, H. The effect of matrix strength on the fracture resistance of an alpha-Beta titanium alloy, corona-5. Metall Trans A 19, 2503–2512 (1988). https://doi.org/10.1007/BF02645478

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  • DOI: https://doi.org/10.1007/BF02645478

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