Abstract
Ti-834 and other titanium alloy forgings can contain regions of similarly orientated primary alpha grains called macrozones that can have a deleterious effect on performance in-service. Understanding the origin of macrozones and how they change during processing is an important step in optimising process routes for these alloys. In this work a detailed characterisation of crystallographic texture variation was carried out on the cross-section of a 250 mm diameter Ti-834 billet using optical metallography, EBSD and neutron texture analysis. Results showed there was a variation in texture and macrozone size and shape through the billet with each macrozone composed of a single hcp component, with varying degrees of orientation spread. The texture of the majority of macrozones can be classed as either axial (c-axis parallel to the billet axis) or transverse (c-axis perpendicular to the billet axis). In the centre of the billet cross-section, the global texture was dominated by a fibre-like {10 1 0} texture due to a dominance of transverse macrozones. At the edge, there was a greater proportion of axial macrozones which gave rise to an additional {0002} component.
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More From: IOP Conference Series: Materials Science and Engineering
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