Metallurgical Abstracts on Light Metals and Alloys vol.55
Grain refinement of additively manufactured pure aluminum by addition of TiC heterogeneous nucleation site particles
Yoshimi Watanabe*, Hiroyuki Sugano*,1, Tadachika Chiba*,2, Hisashi Sato*, Naoko Sato** and Shizuka Nakano**,3
*Nagoya Institute of Technology
**National Institute of Advanced Industrial Science and Technology (AIST)
Present address: 1Rinnai Corporation
2JFE Steel Corporation
3Henry Monitor Inc.
[Published in Journal of Japan Institute of Light Metals, 72, No. 5, 198–205 (2022)]
https://www.jstage.jst.go.jp/article/jilm/72/5/72_7205-T11/_article/-char/en
E-mail: yoshimi[at]nitech.ac.jp
Key Words: Additive manufacture (AM), Laser-based powder bed fusion (PBF-LB), Heterogeneous nucleation, Grain refinement, Texture
In this study, effects of heterogeneous nucleation site particles on density, microstructure and hardness were studied in the pure aluminum samples additively manufactured by laser-based powder bed fusion (PBF-LB) method with a small amount of TiC particles. It was found that higher density of the sample was found by addition of small amount of TiC particles. It was also found that the sample containing 1.0vol% TiC particles has the most refined microstructure. In addition, the samples fabricated with 0vol% and 0.1vol%TiC particles have ⟨101⟩ texture along building direction, whereas ⟨100⟩ texture was observed for the samples with 0.5vol% and 1.0vol%TiC particles. As the volume fraction of TiC particles increases, the hardness of the samples was also increased. Higher hardness in the samples with TiC particles was mainly caused by not reinforcement effects of TiC particles but refinement of grain structure by heterogeneous nucleation.
Relative density, ρ, of the samples with 0vol%, 0.1vol%, 0.5vol% and 1.0vol% TiC heterogeneous nucleation site particles plotted against energy density, E.