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- Title
Heating Conditions in Electrostatic Levitation Experiments for Grain Refinement of Ti-6Al-4V with TiC.
- Authors
Yuji MABUCHI; Hirokazu AOKI; Chihiro HANADA; Yuto UEDA; Koei KADOI; Yuta KUSHIYA; Ryosei SAGUCHI; Kanae YONEDA; Motoko YAMADA; Hisashi SATO; Yoshimi WATANABE; Shumpei OZAWA; Shizuka NAKANO; Chihiro KOYAMA; Hirohisa ODA; Takehiko ISHIKAWA; Yuki WATANABE; Taro SHIMAOKA; Shinsuke SUZUKI
- Abstract
To elucidate the grain refinement mechanism of a titanium alloy (Ti-6Al-4V) with titanium carbide (TiC) heterogeneous nucleation site particles, the space mission Hetero-3D is being carried out in the electrostatic levitation furnace in the International Space Station (ISS-ELF). In this study, as preliminary ground experiments for Hetero-3D, samples of Ti-6Al-4V with TiC were melted and solidified in a ground-based electrostatic levitation (ESL) furnace to establish the heating conditions for the prior-β grain refinement. The number of prior-β grains can be counted on the reconstructed prior-β grain maps in the cross sections of the samples using orientation imaging microscopy software. As a result, the effect of the prior-β grain refinement due to TiC can be confirmed through the degree of undercooling, ∆T, of less than 50 K. TiC particles act effectively with respect to the grain refinement of the sample with 5 mass% TiC in the ESL experiments under the following two heating conditions: (1) the maximum temperature, Tmax, is lower than 2050 K, and (2) the integral value of heating, I (T, t), calculated based on the square of temperature, T, and melting time, t, is smaller than 1.5 × 108 K²∙s. Furthermore, voids are generated on prior-β grain boundaries near the center of the refined sample due to shrinkage during solidification.
- Subjects
TITANIUM alloys; TITANIUM carbide; HETEROGENOUS nucleation; SUPERCOOLING; MICROSCOPY
- Publication
International Journal of Microgravity Science & Application, 2024, Vol 41, Issue 2, p1
- ISSN
0915-3616
- Publication type
Article
- DOI
10.15011/jasma.41.410201