Article Peculiar microstructural evolution and hardness variation depending on laser powder bed fusion-manufacturing condition in Ti–6Al–2Sn–4Zr–6Mo

Prince Valentine Cobbinah ORCID ; Sae Matsunaga ORCID ; Yoshiaki Toda SAMURAI ORCID ; Ryosuke Ozasa ORCID ; Masayuki Okugawa ORCID ; Takuya Ishimoto ORCID ; Yuheng Liu ORCID ; Yuichiro Koizumi ORCID ; Pan Wang ORCID ; Takayoshi Nakano ORCID ; Yoko Yamabe-Mitarai ORCID

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Prince Valentine Cobbinah, Sae Matsunaga, Yoshiaki Toda, Ryosuke Ozasa, Masayuki Okugawa, Takuya Ishimoto, Yuheng Liu, Yuichiro Koizumi, Pan Wang, Takayoshi Nakano, Yoko Yamabe-Mitarai. Peculiar microstructural evolution and hardness variation depending on laser powder bed fusion-manufacturing condition in Ti–6Al–2Sn–4Zr–6Mo. Smart Materials in Manufacturing. 2024, 2 (), 100050.
SAMURAI

Description:

(abstract)

This study comprehensively evaluates the phases, microstructure evolution, and hardness performance of Ti-6Al-2Sn-4Zr-6Mo wt.% parts processed by Laser Powder Bed Fusion (LPBF). A correlation between the LPBF process parameters, generated microstructures, and consequent hardness properties has been established. High laser power inputs at slow scan speed combinations produce pronounced columnar microstructures with nanosized acicular martensitic α phases. Conversely, low laser power input at high scan speeds produces equiaxed microstructures in the scanning direction and exhibits microsized acicular martensitic α phases when observed from the build direction. The sample at 180 W and 1200 mm/s uniquely forms an equiaxed microstructure in the scanning and build directions. Insights from the computational thermal fluid dynamics simulation reveal that higher thermal gradients and cooling rates at the melt pool surface promote the formation of equiaxed grains ahead of the columnar solidification front. Also, the hardness performance of all fabricated samples at fixed power inputs (180-360 W) decreases with increasing scan speed (600-1400 mm/s). The average hardness of the LPBFed-samples range from 513.15 HV to 328.75 HV.

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Keyword: LPBF, Ti6246, Polycrystaline microstructure, Metastable phase, Rapid cooling, Thermal history

Date published: 2024-03-27

Publisher: Elsevier BV

Journal:

  • Smart Materials in Manufacturing (ISSN: 27728102) vol. 2 100050

Funding:

  • Japan Society for the Promotion of Science JP21H05198 (Science for Creation of Super-Titanium by Super-Thermal Field)
  • Japan Society for the Promotion of Science JP23H00235
  • Japan Science and Technology Agency JPMJCR2194
  • Light Metal Educational Foundation

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.smmf.2024.100050

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Updated at: 2024-05-01 08:30:09 +0900

Published on MDR: 2024-05-01 08:30:10 +0900

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