期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.06.025
关键词
TiAl alloys; Hot deformation; Microstructure; Oxidation; Mechanical properties
类别
资金
- National Natural Science Foundation of China [51604191, 51504163, 51604159]
- State Key Laboratory for Advanced Metal and Materials foundation [2014-ZD06]
- Special/Youth Foundation of Taiyuan University of Technology [2015QN014, 2013T004, 2013T003]
- Qualified Personnel Foundation of Taiyuan University of Technology [tyutrc201342a, tyutrc201343a]
New type beta-gamma TiAl alloy of nominal composition of Ti-44Al-4Nb-4V-0.3Mo-Y (at%) was fabricated by induction skull melting, which was designed based on the study of the microstructural effects of Mo, Cr, V, and Nb on TiAl alloy. The microstructure, oxidation resistance, hot workability, and tensile properties were studied by SEM in BSE mode, XRD, Gleeble 3800, as well as Instron 5500 R, respectively. The oxidation resistance of this new designed Mo containing beta-gamma TiAl alloy was better than that of only Nb and V containing beta gamma TiAl alloy. With a better hot workability at temperature under 1200 degrees C, Ti-44Al-4Nb-4V-0.3Mo-Y alloy was successfully hot forged at 1150 degrees C with a traditional hydraulic machine without thermal insulation measure. Though containing abound order beta(0) phase, the new fabricated beta-gamma TiAl alloy still has a high elongation at 850 degrees C, because of less alpha(2) +gamma lamellar colonies containing. Benefits of partly replacing Mo with V was avoiding omega phase precipitation, and not damaging the hot workability.
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