In:
IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 563, No. 2 ( 2019-07-01), p. 022025-
Abstract:
Continuous grain boundary α phase ( α gb ) is widely present in laser melting deposited near β and β titanium alloys, and it can lead to intergranular fracture and low ductility. Because of the preferential nucleation and growth of α phase at β grain boundaries, the continuous α gb cannot be effectively eliminated by traditional heat treatment. Thus, in this study, we develop a new heat treatment including beta solution + ultra-slow furnace heating up + traditional heat treatment, to eliminate continuous α gb in laser melting deposited Ti-5Al-5Mo-5V-1Cr-1Fe near β titanium alloy, and the microstructures and tensile properties are investigated. The results indicated that, after beta solution + normal heating up + traditional heat treatment, the continuous α gb still exists, and the elongation is still low about 7.5%. However, after beta solution + ultra-slow heating up + traditional heat treatment, there are almost no continuous α gb , and the elongation increases to 15.2%. The mechanism about the α gb formation during ultra-slow heating up process is simply revealed. Furthermore, this new heat treatment is also suitable to eliminate continuous α gb for laser melting deposited Ti17 alloy.
Type of Medium:
Online Resource
ISSN:
1757-8981
,
1757-899X
DOI:
10.1088/1757-899X/563/2/022025
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2019
detail.hit.zdb_id:
2506501-4
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