Journal
MATERIALS & DESIGN
Volume 83, Issue -, Pages 499-507Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.06.015
Keywords
Ti-7333; Near beta titanium alloy; Solution treatment; Grain growth; alpha precipitation; Orientation relationship; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51371143]
- Program Cai Yuanpei [30249RD]
- Program of Introducing Talents of Discipline to Universities [B08040]
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The effect of solution treatment on the microstructure and mechanical properties of Ti-7333, a newly developed near beta titanium alloy, was investigated. Compared to Ti-5553 and Ti-1023, Ti-7333 possesses the slowest alpha to beta dissolution rate, allowing a wider temperature window for processing. The rate of beta grain growth decreases with the increase of soaking time and increases with the increase of solution temperature. The beta grain growth exponents (n) are 0.30, 0.31, 0.32 and 0.33 for solution treatment temperature of 860 degrees C, 910 degrees C, 960 degrees C and 1010 degrees C, respectively. The activation energy (Q(g)) for beta grain growth is 395.6 kJ/mol. Water cooling or air cooling after solution treatment have no significant influence on microstructure, which offers large heat treatment cooling window. However, under furnace cooling, the fraction of alpha phase increases sharply. a phase maintains strictly the Burgers orientation relation with beta phase ((0001)(alpha)//{110)(beta) and < 11-20 >(alpha)//< 111 >(beta), except the alpha(p) particles formed during forging. The tensile strength decreases with the increase of the solution temperature when only solution treatment is applied, whereas the ductility increases gradually. When aging is applied subsequently, the tensile strength increases with the increase of the solution temperature and the ductility decreases gradually. (C) 2015 Elsevier Ltd. All rights reserved.
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