通过静电悬浮法无坩埚加工钛与钛碳异质成核点颗粒

IF 2.5 4区 工程技术 Q3 CHEMISTRY, PHYSICAL International Journal of Thermophysics Pub Date : 2024-09-28 DOI:10.1007/s10765-024-03435-y
Yoshimi Watanabe, Goro Takahashi, Ryosei Saguchi, Hisashi Sato, Hirokazu Aoki, Shinsuke Suzuki, Shizuka Nakano, Yuki Watanabe, Chihiro Koyama, Hirohisa Oda, Takehiko Ishikawa
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引用次数: 0

摘要

本研究通过静电悬浮实验研究了含有 TiC 粒子的熔融纯 Ti 的微观结构、硬度、密度、粘度和表面张力,其中静电悬浮实验涉及无容器加工,可通过坩埚抑制异质成核。显微结构观察显示,纯 Ti 样品的整个区域都出现了长针状的 α 晶粒。另一方面,在含有 TiC 颗粒的样品中发现了较小的针状 α 晶粒。然而,对 Ti + 0.7vo l%TiC 样品进行的详细微观结构分析表明,在 Ti + 0.7vo l%TiC 中观察到的细小 α 晶粒是由先前的 β 相单个晶粒转变而来的。这是因为在静电悬浮实验中,TiC 颗粒溶解到了熔融 Ti 中。相反,冷却时形成的富钛 TiC 沉淀可以作为钉扎点,而不是异质成核点,这导致在静电悬浮实验中含有 TiC 颗粒的样品具有更精细的微观结构。样品的密度与温度呈线性关系,并且随着温度的升高而降低。此外,含有 TiC 颗粒的样品密度更高。虽然表面张力与温度之间存在线性关系,但添加 TiC 粒子对熔融纯 Ti 的粘度没有明显影响。
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Crucible-less Processing of Ti with TiC Heterogeneous Nucleation Site Particles by Electrostatic Levitation

In this study, the microstructure, hardness, density, viscosity, and surface tension of molten pure Ti with TiC particles were studied via electrostatic levitation experiments, where the electrostatic levitation experiment involved container-less processing, which can suppress heterogeneous nucleation via crucibles. Microstructural observation revealed long needle-shaped α-grains across the whole area in the pure Ti sample. On the other hand, smaller needle-shaped α-grains were found in the samples with TiC particles. However, the detailed microstructural analysis of Ti + 0.7vo l%TiC sample revealed that the fine α-grains observed in the Ti + 0.7vo l%TiC are transformed from single grain of prior β phase. This is because the TiC particles dissolve into the molten Ti during the electrostatic levitation experiment. Instead, Ti–rich TiC precipitates formed by cooling can act as pinning sites rather than heterogeneous nucleation sites, which results in a finer microstructure for the samples with TiC particles during the electrostatic levitation experiment. The density of the samples is linearly related to the temperature, and it decreases with increasing temperature. In addition, a higher density is observed for the samples with TiC particles. Although linear relationships between the surface tension and temperature were found, the addition of TiC particles had no notable effect on the viscosity of the molten pure Ti.

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来源期刊
CiteScore
4.10
自引率
9.10%
发文量
179
审稿时长
5 months
期刊介绍: International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.
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