摘要
采用水冷铜坩埚感应熔炼技术制备了高质量的Ti-43Al-9V-0.3Y合金铸锭,该合金铸态组织为近层片组织结构,层片团簇的体积分数为85%左右,大小约为80μm,块状β和γ相位于层片团簇边界。层片结构中除了γ和α2相外,还存在少量的β相析出物。Ti-43Al-9V-0.3Y合金具有良好的热加工性能,通过包套锻造和包套轧制技术,成功制备了大尺寸TiAl合金锻饼和国内最大尺寸TiAl合金板材,其尺寸分别为260mm×24mm和500mm×300mm。经热变形后,Ti-43Al-9V-0.3Y合金的显微组织明显细化,力学性能得到了显著提高。
A high quality TiAI alloy ingot with a nominal composition of Ti-43Al-9V-0. 3Y （at. % ） was prepared using water cooled Introduction Skull Melting. The microstrueture of as-east Ti-43Al-9V-0. 3Y alloy was nearly fully lamellar structure with the lamellar volume fraction of 85% and a mean lamellar size of 80 μm. It was apparent that bulk/3 and γ phases were located at the lamellar colony boundaries and some/3 phase existed at lamellar structure besides T and α2 phases. The Ti-43Al-9V-0. 3Y alloy exhibited excellent hot deformability, and large pancake and the largest sheet of TiAl alloy in China, with size of Ф260 mm × 24 mm and 500 mm× 300 mm, respectively, were successfully prepared through pack forging and rolling. After hot deformation, the microstructure of TiAl alloy was refined obviously and the mechanical properties were improved promptly.
出处
《中国材料进展》
CAS
CSCD
2010年第3期12-17,共6页
Materials China
基金
国家自然科学基金资助项目(50274035
50674037)
关键词
TIAL合金
加工
组织
性能
TiAl alloy
processing
mierostructure
properties
