Rolling of Plates and Sheets from As-Cast Ti-6Al-4V-0.1B

Abstract

Trace boron addition ($0.1 wt.%) to conventional titanium alloys reduces the as-cast prior-beta grain size by an order of magnitude to about 200 lm, a grain size typically observed after ingot breakdown. In this study, the feasibility of producing plate and sheet by hot rolling of as-cast Ti-6Al-4V-0.1B (wt.%) was evaluated. Starting from an initial thickness of 25 mm, as-cast Ti-6Al-4V-0.1B was successfully rolled to 2 mm sheet in a multistep rolling process. As-cast Ti-6Al-4V (without boron addition) rolled under similar conditions exhibited severe cracking. Tensile properties of the sheets and plates made from the boroncontaining alloy met or exceeded AMS 4911 specifications for Ti-6Al-4V plates and sheets produced by conventional processing route. The process of making plate and sheet stock from cast titanium alloy ingots, without recourse to expensive ingot breakdown, can significantly reduce the number of expensive and timeconsuming processing steps for making titanium alloy components, thereby enhancing the affordability and expanding the range of titanium applications.

The Microstructural Characterization and Mechanical Properties of 5 vol. % (TiBw + TiCp)/Ti Composite Produced by Open-Die Forging

“…While in the centre area, as a result of the relatively high temperature and large deformation, the voids between the reinforcement ends and matrix can be completely closed, as shown in Figure 3d. Similar results were also reported previously [25].…”

Microstructural Characterization and Mechanical Properties of 5 vol.% (TiB_w+TiC_p)/Ti Composite Produced by Forging

“…While in the centre area, as a result of the relatively high temperature and large deformation, the voids between the reinforcement ends and matrix can be completely closed, as shown in Fig.2d. Similar results were also reported previously [25].…”

Direct Rolling of TiCp/Ti–6Al–4V Composite for Improved Microstructure, Mechanical Properties, and High‐Temperature Oxidation Resistance

“…It is worth mentioning that no voids can be observed in the as‐rolled composite, which can be related to the faster flow velocity of the matrix compared with that of TiC particles during rolling. [ 16 ] The dominate matrix microstructure of as‐rolled composite, shown in Figure 2e, was bimodal microstructure composed of equiaxed primary α phase (α p ) and a transformed β matrix, of which the formation mechanism is attributed to the recrystallization processes. [ 17 ] Within the transformed β matrix, the secondary α lath (α s ) and thin β phase embedded in the α s can be clearly seen in Figure 2f.…”