Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1635026 | Rare Metals | 2008 | 6 Pages |
Abstract
The effect of heat treatment on the microstructure evolution of a high Nb containing TiAl alloy has been studied. The results indicate that β-segregation, α-segregation and S-segregation in the as-cast and as-forged alloys can be effectively eliminated at the temperature above Tα (1350-1400°C) for long holding time (12-24 h) and the full lamellar (FL) microstructure is gained. For the two alloys, the lamellar colony sizes are 120 μm and 2000 μm, respectively after heat treatment at 1400°C for 12 h. Meanwhile, the sizes are 210 μm and 3000 μm, respectively at 1350°C for 24 h. To get a fine homogenous microstructure, the primary as-cast alloy is first subjected to preheat treatment for eliminating the segregations. After the preheat treatment, the alloy is processed by the multi-step canned forging to attain the microstructure with fine grain size.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
XU Zhengfang, XU Xiangjun, LIN Junpin, ZHANG Yong, WANG Yanli, LIN Zhi, CHEN Guoliang,