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Metals 2015, 5(2), 777-789;

Manufacturing Ultrafine-Grained Ti-6Al-4V Bulk Rod Using Multi-Pass Caliber-Rolling

Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208, USA
Boeing Research & Technology, St. Louis, MO 63166, USA
Graduate Institute of Ferrous Technology, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea
Author to whom correspondence should be addressed.
Academic Editor: Heinz Werner Höppel
Received: 11 March 2015 / Revised: 27 April 2015 / Accepted: 30 April 2015 / Published: 15 May 2015
(This article belongs to the Special Issue Ultrafine-grained Metals)
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Ultrafine-grained (UFG) Ti-6Al-4V alloy has attracted attention from the various industries due to its good mechanical properties. Although severe plastic deformation (SPD) processes can produce such a material, its dimension is generally limited to laboratory scale. The present work utilized the multi-pass caliber-rolling process to fabricate Ti-6Al-4V bulk rod with the equiaxed UFG microstructure. The manufactured alloy mainly consisted of alpha phase and showed the fiber texture with the basal planes parallel to the rolling direction. This rod was large enough to be used in the industry and exhibited comparable tensile properties at room temperature in comparison to SPD-processed Ti-6Al-4V alloys. The material also showed good formability at elevated temperature due to the occurrence of superplasticity. Internal-variable analysis was carried out to measure the contribution of deformation mechanisms at elevated temperatures in the manufactured alloy. This revealed the increasing contribution of phase/grain-boundary sliding at 1073 K, which explained the observed superplasticity. View Full-Text
Keywords: multi-pass caliber-rolling; grain refinement; internal-variable theory; Ti-6Al-4V multi-pass caliber-rolling; grain refinement; internal-variable theory; Ti-6Al-4V

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Lee, T.; Shih, D.S.; Lee, Y.; Lee, C.S. Manufacturing Ultrafine-Grained Ti-6Al-4V Bulk Rod Using Multi-Pass Caliber-Rolling. Metals 2015, 5, 777-789.

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