Microstructure and shear strength ofγ-TiAl/GH536 joints brazed with Ti-Zr-Cu-Ni-Fe-Co-Mo filler alloy  

Ti-Zr-Cu-Ni-Fe-Co-Mo钎料合金钎焊γ-TiAl/GH536接头的显微组织与剪切强度

作　　者：Li LI Wei ZHAO Zhi-xue FENG Jia SUN Xiao-qiang LI 李力;赵巍;冯志雪;孙佳;李小强(华东交通大学材料科学与工程学院,南昌330013;华南理工大学国家金属材料近净成形工程技术研究中心,广州510640;中车南京浦镇车辆有限公司转向架设计部,南京210031)

机构地区：[1]School of Materials Science and Engineering,East China Jiaotong University,Nanchang 330013,China [2]National Engineering Research Center of Near-net-shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China [3]Bogie Design Department,CRRC Nanjing Puzhen Co.Ltd.,Nanjing 210031,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第8期2143-2155,共13页中国有色金属学报（英文版）

基　　金：Project(51865012)supported by the National Natural Science Foundation of China;Project(20202BABL204040)supported by the Natural Science Foundation of Jiangxi Province,China;Project(2016005)supported by the Open Foundation of National Engineering Research Center of Near-net-shape Forming for Metallic Materials,China;Project(GJJ170372)supported by the Science Foundation of Educational Department of Jiangxi Province,China;Project(JCKY2016603C003)supported by the GF Basic Research Project,China;Project(JPPT125GH038)supported by the Research Project of Special Furnishment and Part,China。

摘　　要：The influence of brazing temperature and brazing time on the microstructure and shear strength ofγ-TiAl/GH536 joints brazed with Ti-Zr-Cu-Ni-Fe-Co-Mo filler was investigated using SEM,EDS,XRD and universal testing machine.Results show that all the brazed joints mainly consist of four reaction layers regardless of the brazing temperature and brazing time.The thickness of the brazed seam and the average shear strength of the joint increase firstly and then decrease with brazing temperature in the range of 1090-1170℃and brazing time varying from 0 to 20 min.The maximum shear strength of 262 MPa is obtained at 1150℃for 10 min.The brittle Al3NiTi2 and TiNi3 intermetallics are the main controlling factors for the crack generation and deterioration of joint strength.The fracture surface is characterized as typical cleavage fracture and it mainly consists of massive brittle Al3NiTi2 intermetallics.采用Ti-Zr-Cu-Ni-Fe-Co-Mo作为钎料,在钎焊温度1090~1170℃、钎焊时间0~20 min的工艺参数下,实现γ-TiAl和GH536合金的钎焊连接,利用SEM、EDS、XRD和万能试验机研究钎焊温度和钎焊时间对钎焊接头显微组织和剪切强度的影响。结果表明:不同工艺参数下获得的γ-TiAl/GH536钎焊接头均包括4个界面反应层。随着钎焊温度的升高和钎焊时间的延长,钎缝宽度和钎焊接头的平均抗剪强度均是先增大后减小。钎焊温度1150℃、钎焊时间10 min时获得的钎焊接头的剪切强度最大,达262 MPa。Al3NiTi2和TiNi3脆性金属间化合物是产生裂纹和降低接头强度的主控因素,Al3NiTi2脆性金属间化合物几乎占据整个呈典型解理断裂特征的剪切断口表面。

关 键 词：γ-TiAl alloy Ni-based superalloy vacuum brazing amorphous filler MICROSTRUCTURE shear strength 

分 类 号：TG454[金属学及工艺—焊接]