期刊
ACTA MATERIALIA
卷 91, 期 -, 页码 289-303出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.03.035
关键词
Deposition; Grain refinement; Solidification microstructure; Titanium alloys; Mechanical properties
资金
- Queensland Centre for Advanced Materials Processing and Manufacturing (AMPAM)
- Australian Research Council's Linkage Program
- Queensland Government's Research Partnership Program
- University of Queensland ECR Program
This study demonstrates that trace boron addition to Ti-6Al-4V coupons produced by additive layer manufacturing is an effective way to eliminate the deleterious anisotropic microstructures often encountered with this manufacturing technique. Trace boron additions (up to 0.13 wt.%) to this alloy eliminate grain boundary-a and colony-alpha, and instead produce a homogeneous alpha-microstructure consisting of fine equiaxed alpha-grains in both as-deposited and heat treated coupons. Prior-beta grains remain columnar with boron addition but become narrower due to the wider solidification range and growth restricting effect of the boron solute. Compared to unmodified Ti-6Al-4V alloy, Ti-6Al-4V modified with trace boron additions showed up to 40% improvement in plasticity with no loss in strength under uniaxial compression at room temperature. Boron additions were found to inhibit twinning transmission that causes sudden large load drops during deformation of the unmodified Ti-6Al-4V alloy in the heat treated condition. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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