Thermal expansion and lattice parameters of shaped metal deposited Ti-6Al-4V |
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Authors: | Akhilesh Kumar SwarnakarOmer Van der Biest Bernd Baufeld |
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Affiliation: | Katholieke Universiteit Leuven, MTM, Kasteelpark Arenberg 44, 3001 Leuven, Belgium |
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Abstract: | Thermal expansion and lattice parameters are investigated up to 1100 °C for Ti-6Al-4V components, fabricated by shaped metal deposition. This is a novel additive layer manufacturing technique where near net-shape components are built by tungsten inert gas welding.The as-fabricated SMD Ti-6Al-4V components exhibit a constant coefficient of thermal expansion of 1.17 × 10−5 K−1 during heating up to 1100 °C, not reflecting the α to β phase transformation. During cooling a stalling of the contraction is observed starting at the β transus temperature. These high temperature experiments denude the α phase of V and enrich the β phase.The development of the lattice parameters in dependence on temperature are observed with high temperature X-ray diffraction. The unit cell volumes derived from these parameters are at room temperature larger for the α than for the β phase. With increasing temperature the unit cell volume of the β phase increases stronger than the one of the α phase resulting in a similar unit cell volume at the β transus temperature.These observations are interpreted as an indication for as-fabricated the SMD components being in a non-equilibrium state and reaching equilibrium during the slow heating and cooling during of the two different high temperature experiments. |
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Keywords: | Shaped metal deposition Titanium alloy Thermal expansion High temperature X-ray diffraction Phase transformation |
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