Abstract
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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
