2005•Materials science forumOpen access

Microstructure and Tensile Properties of Hot Worked High Nb Containing TiAl Alloy on Industrial Scale

Jun Lin, Xiang Jun Xu, Jian Gao, Yan Li Wang, Zhi Lin, Guo Liang Chen

Abstract

. A hot working and its effect on the microstructure and tensile properties of Ti-45Al-9 (Nb, W, B, Y) alloy ingot on industrial scale were investigated. The results showed that the alloy has good workability in anα+γphase region. An ingot on industrial scale was successfully extruded followed by multi-step canned forging. The initial microstructure of the alloy is fine full lamellar (FL) microstructure. After hot working a sound pancake exhibiting a fine grain duplex (DP) microstructure with grain size about 20μm was obtained. The as-forged alloy has more balanced tensile properties than the small heats with similar composition and microstructure at both room and high temperatures.

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Key concepts: Ingot, Microstructure, Materials science, Alloy, Metallurgy, Ultimate tensile strength, Forging, Lamellar structure