摘要
Ti-6Al-4V specimens with different thermal histories were obtained by controlling their solidification and cooling through an automatic temperature-controlled induction melting apparatus. The final microstructure of Ti-6Al-4V was determined by both isothermal holding temperature and time during solidification, especially near the β transus temperature. A unique bimodal microstructure consisting of high aspect ratio α particles and small colonies with fine secondary lamellar α appeared in specimens isothermally held from 950°C to 970°C. Water quenching was conducted after isothermal holding treatment for comparison. X-ray diffraction, transmission electron microscopy, and electron probe microanalysis were used to explore the evolution mechanism of the unique bimodal microstructure. Primary α breakdown occurred during isothermal holding treatment because of Ostwald ripening and boundary splitting mechanisms. The formation of small colonies with fine secondary lamellar α was also discussed.
源语言 | 英语 |
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页(从-至) | 281-287 |
页数 | 7 |
期刊 | Journal of Materials Processing Technology |
卷 | 227 |
DOI | |
出版状态 | 已出版 - 15 1月 2016 |