热处理对二次锻造高Nb-TiAl基合金组织的影响  

Effect of Heat Treatment on the Microstructure of Two-step Forging for High Nb Containing TiAl Alloy

作　　者：徐丽华[1] 徐向俊[1] 王艳丽[1] 林均品[1] 宋西平[1] 林志[1] 陈国良[1] 李树索[2] 苏喜孔[2] 韩雅芳[2] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]北京航空航天大学高性能材料研究所,北京100083

出　　处：《航空材料学报》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)

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.

关 键 词：高Nb—TiAl合金 热处理 显微组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]