Microstructures and hardness of Ti-6A1-4V alloy staging castings under centrifugal field

• Published in: Transactions of Nonferrous Metals Society of China Vol. 18; no. 2; pp. 291 - 296
• Main Author: 隋艳伟 李邦盛 刘爱辉 南海 郭景杰 傅恒志
• Format: Journal Article
• Language: English
• Published: 2008
• Subjects: 微观结构; 离心场
• ISSN: 1003-6326

By means of induction melting technology, Ti-6A1-4V alloy staging casting was made with the same rotation velocity and centrifugal radius. The effects of casting modulus on the grain size, the thickness of lamellar α＋β phase, and the Vickers hardness, as well as the relationships between Vickers hardness, grain size and thickness of lamellar α＋β phase were investigated. The results show that the greater the modulus, the larger the grain size and the thickness of lamellar α＋β phase, and the less the Vickers hardness. The relationship between Vickers hardness and grain size meets the Hall-Petch equation： Hv=353.45＋74.17dG^-1/2. The relationship between the Vickers hardness and the thickness of lamellar α＋β phase is expressed as Hv=2.45d^2α＋β-35.96dα＋β ＋ 476.84.