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Influence of texture on fatigue properties of Ti-6Al-4V

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Abstract

Tensile properties, high cycle fatigue strength, and fatigue crack propagation behavior were evaluated on highly textured Ti-6Al-4V material to investigate the influence of a preferred crystallographic orientation on mechanical properties. Thermomechanical treatments were used to develop three different textures: a basal, basal/transverse, and transverse type, all of which exhibited the same homogeneously equiaxed microstructure. The Young’s modulus was found to vary between 107 and 126 GNm-2, and yield strength changed from 1055 to 1170 MNm-2. Ductility was only slightly affected by texture. High cycle fatigue and fatigue crack growth measurements were performed in vacuum, laboratory air, and a 3.5 pct NaCl solution. It is shown that laboratory air can be regarded as a quite corrosive environment. In vacuum the highest fatigue strength values were measured whenever loads were perpendicular to basal planes. However, these conditions had the highest susceptibilities to air and 3.5 pct NaCl solution environments. Nearly no influence of texture on fatigue crack propagation was found in vacuum, but in a corrosive environment crack growth parallel to (0002)-planes was much faster than perpendicular to these planes. To explain the corrosive effect on the fatigue properties of the textured material hydrogen is thought to play a key role.

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Authors and Affiliations

  1. Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt (DFVLR), Institut für Werkstoff-Forschung, Köln 90, D-5000, West Germany

    M. Peters (Research Scientist), A. Gysler (Professors) & G. LÜtjering (Professors)

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  1. M. Peters
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  2. A. Gysler
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  3. G. LÜtjering
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Peters, M., Gysler, A. & LÜtjering, G. Influence of texture on fatigue properties of Ti-6Al-4V. Metall Trans A 15, 1597–1605 (1984). https://doi.org/10.1007/BF02657799

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