Download file (7.62MB)
Download as zip (6.59MB)

コレクション

引用

説明:

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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: LPBF, Ti6246, Polycrystaline microstructure, Metastable phase, Rapid cooling, Thermal history

刊行年月日: 2024-03-27

出版者: Elsevier BV

掲載誌:

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

研究助成金:

• 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

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.smmf.2024.100050

関連資料:

その他の識別子:

連絡先:

更新時刻: 2024-05-01 08:30:09 +0900

MDRでの公開時刻: 2024-05-01 08:30:10 +0900