Ti-22Al-25Nb合金板材的钎焊工艺  

Study on brazing process of Ti-22Al-25Nb alloy sheet

作　　者：静永娟[1] 柴禄[1] 高兴强[1] 

机构地区：[1]北京航空制造工程研究所,北京100024

出　　处：《焊接学报》2015年第11期89-92,117,共4页Transactions of The China Welding Institution

基　　金：中航工业创新基金资助项目(2013E62534R)

摘　　要：采用试验手段研究了Ti-22Al-25Nb合金板材的钎焊工艺.结果表明,当钎焊温度为960℃时,Ti_2Al Nb合金板材组织中短棒状O相组织发生少量溶解、块状O相组织的晶粒尺寸普遍增大,基体晶粒略粗化,但未出现相转变;随保温时间由15,30和60 min逐渐延长,Ti2Al Nb合金板材室温强度由1 257 MPa减少到1 000-1 100 MPa,但塑性不断提高,室温断后伸长率平均值由2.9%依次提高至3.4%,5.8%及5.0%.确定出Ti_2Al Nb合金板材的钎焊工艺参数为960℃/30 min/炉冷,此时相应接头抗剪强度较高,可达152 MPa.The brazing process of Ti-22Al-25 Nb alloy sheet was studied. The influences on the microstructure and the tensile strength of the matrix from the brazing process were studied in this paper. The strength of the brazing joints was tested. A few of short rod O phases were dissolved and lots of O phases were grown up in the matrix during the brazing process as the brazing temperature being 960 ℃. The grain size of the matrix was increased without phase transition. With heat preservation time by 15,30 and 60 min extended gradually,the room temperature strength of the matrix was decreased from 1 257 to 1 100 MPa and the average room temperature elongation was increased from 2. 9% up to 3. 4%,5. 8% and 5. 0%. The optimized brazing technology parameters of Ti2 AlN b alloy plate is 960 ℃ /30 min / furnace cooling with the higher shear strength of the brazed joints as 152 MPa.

关 键 词：Ti2AlNb合金 钎焊 力学性能 

分 类 号：TG453[金属学及工艺—焊接]