Optimization of Microstructure and Elimination of β(B2) Phase in As-Cast Ti-Al-Nb-W-B Alloy

被引：1
|
作者：
Zhang Wei [1 ]
Liu Yong [1 ]
Huang, Jinsong [1 ]
Liu Bin [1 ]
He Yuehui [1 ]
Huang Boyun [1 ]
机构：
[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2009年 / 38卷 / 10期
关键词：
TiAl alloy; beta(B-2) phase; microstructure; heat treatment; clad forging; thermal mechanical treatment; BORON ADDITION; TUNGSTEN;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructures of as-cast Ti-Al-Nb-W-B alloy were investigated to assess the possibility of eliminating the triaxial beta(B-2) phase on the crystal boundary through heat treatment and multi-step forging thermal mechanical treatment. The microstructure evolution and growth mechanism were studied according to Ti-Al-Nb ternary phase diagram, and then the process of eliminating of the triaxial beta(B-2) phase on the crystal boundary was assessed. The results of the experiments indicate that the best way to eliminate beta(B-2) phase is holding at the 1260 degrees C for 8 h or 1220 degrees C for 36 h followed by furnace cooling, but the grains grow appreciably. On the other hand, after multi-step forging with a total deformation of more than 80%, the as-cast nearly lamellar structure can be refined obviously to the duplex microstructure, and the beta(B-2) phase is basically eliminated.
引用
收藏
页码：1711 / 1717
页数：7
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