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The influence of stress trlaxiality on the damage mechanisms in an equiaxedα/β Ti-6AI-4V alloy

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Abstract

The influence of the stress triaxiality on void formation, void growth, and fracture was investigated for an equiaxed Ti-6A1-4V alloy. Void nucleation in theα phase was found to occur for a critical value of macroscopic plastic strain, whereas void nucleation at theα/β interface also depends on triaxiality. Under low triaxiality and important plastic strain, voids appear and grow in the area where the microshear bands develop, with an angle close to 45 deg to the stress axis in theα particles. In contrast, with high triaxiality, voids nucleate preferably at theα/β interfaces and grow perpendicular to the stress axis by a cleavage mechanism. In a middle range of triaxiality and plastic strain, voids nucleate inα because of the sufficient plastic strain and also at theαβ interfaces because of the sufficient triaxiality(X). Void growth occurs with an angle of 60 deg to the stress axis, sinceX is not high enough to create cleavage andε p is high enough to provide a ductile growth. Two types of fracture were identified and reported on a fracture map: under low triaxiality, failure appears by plastic instability, whereas for high triaxiality, the instability is induced by a void-growth process discussed with the help of Rice and Tracey’s approach.

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Authors and Affiliations

  1. Division Mécanique, Université de Technologie de Compiègne, 60206, Compiègne Cédex, France

    A. L. Helbert (Research Scientist), X. Feaugas (Assistant Professor) & M. Clavel (Professor)

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  1. A. L. Helbert
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  2. X. Feaugas
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  3. M. Clavel
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Helbert, A.L., Feaugas, X. & Clavel, M. The influence of stress trlaxiality on the damage mechanisms in an equiaxedα/β Ti-6AI-4V alloy. Metall Mater Trans A 27, 3043–3058 (1996). https://doi.org/10.1007/BF02663853

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