摘要
研究了热处理对二次锻造高Nb-TiAl基合金组织的影响。通过对Ti-45Al-9(Nb,W,B,Y)金属间化合物进行不同的热处理,得到不同的显微组织。结果表明,经1310℃/20min+1250℃/2h/AC热处理后,β相被有效地消除,得到细小均匀的双态组织。此后直接加热到α单相区,得到条带状的全片层组织。增加在两相区的停留,得到相对比较均匀细小的全片层组织。将锻造组织先转变为近γ组织再进行全片层组织处理,得到最均匀细小的全片层组织。
Effect of heat treatment processings on the microstructure of two-step forging for high Nb containing TiAl alloy was investigated. Different heat treatment processes were employed to obtain different microstructures of Ti-45Al-9 （Nb,W,B,Y） alloy. The results show that, after the heat treatment of 1310℃/20min ＋ 1250 ℃/2h/AC, the α phase can be efficiently eliminated and the uniform fine duplex microstructures can be gained. Followed by the heat treatment at α single phase region directly, striped FL microstructure of coarse colony and fine colony is obtained. The holding at （ α ＋ λ） phase region can result in the homogenous fine FL microstructurere latively. The FL microstructure produced by the heat treatment of HT6 is the most homogenous and finest.
出处
《航空材料学报》
EI
CAS
CSCD
2005年第4期16-19,共4页
Journal of Aeronautical Materials
基金
国家重点基础研究发展规划(G200067206-2)
