Abstract
A new biomedical Ti-18Zr-14Nb (at.%) alloy was processed using the laser powder bed fusion additive manufacturing technology and subjected to post-fusion annealing in the 400 to 900 °C temperature range. The meltpool and grain structure features, the phase composition and hardness of samples fabricated using different laser energy densities and build rates, while having identical printed material densities, were analyzed. It was shown that the microstructure of the alloy differs depending on the printing parameters used. The higher the energy density, the coarser in size and the more elongated towards the build plate grains are formed during the process. Subsequent annealing results in the formation of different structures depending on the printing conditions, and the smaller the as-built grain size, the lower the onset temperature of recrystallization, which starts up to 100 °C lower for the finer grain structure than for the coarser grain structure of this study.
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