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Indexed by:期刊论文

Date of Publication:2018-11-01

Journal:VACUUM

Included Journals:SCIE

Volume:157

Page Number:395-401

ISSN No.:0042-207X

Key Words:Titanium alloys; Electron beam smelting; Elemental volatilization; Kinetics; Composition control

Abstract:Electron beam smelting is an effective technology for removal of inclusions from titanium alloys and improvement of metallurgical quality. However, since different element has different volatilization capacity, resulting in a large deviation in alloy composition, which affects the performance of titanium alloys. In this paper, the volatility trend of the components in a Ti-Al-Cr-Nb quaternary model alloy was evaluated and a calculation model for alloy composition change was established based on Langmuir's volatilization rate theory. The results show that, for the other three elements in the alloy, the order of relative volatility coefficient is Al > Cr > Nb. The mass fraction of Al in the alloy will be significantly reduced after smelting, which plays an important role in control of alloy composition. The effect of temperature on the change of alloy composition is greater than that of smelting time. When the temperature is over 2100 K, the composition changes too much in a very short time. The experimental results are consistent with the theoretical results, indicating the applicability of the model.