Influence of solution treatment on microstructure and mechanical properties of a near β titanium alloy Ti-7333

Abstract : The effect of solution treatment on the microstructure and mechanical properties of Ti-7333, a newly developed near β titanium alloy, was investigated. Compared to Ti-5553 and Ti-1023, Ti-7333 possesses the slowest α to β dissolution rate, allowing a wider temperature window for processing. The rate of β grain growth decreases with the increase of soaking time and increases with the increase of solution temperature. The β grain growth exponents (n) are 0.30, 0.31, 0.32 and 0.33 for solution treatment temperature of 860°C, 910°C, 960°C and 1010°C, respectively. The activation energy (Qg) for β grain growth is 395.6kJ/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 α phase increases sharply. α phase maintains strictly the Burgers orientation relation with β phase ({0001}α//{110}β and 〈11−20〉α//〈111〉β), except the αp 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.
Type de document :
Article dans une revue
Materials & Design, 2015, 83, pp.499 - 507. 〈10.1016/j.matdes.2015.06.015〉
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https://hal.univ-lorraine.fr/hal-01515419
Contributeur : Lem3 Ul <>
Soumis le : jeudi 27 avril 2017 - 14:43:33
Dernière modification le : mercredi 12 septembre 2018 - 01:27:38

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Jiangkun Fan, Jinshan Li, Hongchao Kou, Ke Hua, Bin Tang, et al.. Influence of solution treatment on microstructure and mechanical properties of a near β titanium alloy Ti-7333. Materials & Design, 2015, 83, pp.499 - 507. 〈10.1016/j.matdes.2015.06.015〉. 〈hal-01515419〉

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