DD3单晶合金TLP扩散焊接头的高温拉伸性能和持久性能  

Mechanical properties of TLP diffusion bonded joints of DD3 single crystal superalloy

作　　者：毛唯[1] 李晓红[1] 周媛[1] 叶雷[1] 陈波[1] 吴欣[1] 程耀永[1] 

机构地区：[1]北京航空材料研究院,100095

出　　处：《焊接》2008年第3期28-31,共4页Welding & Joining

摘　　要：为了实现DD3单晶合金叶片的优质连接,采用专为DD3设计的XH4A中间层合金,对DD3进行了TLP扩散焊试验。在1240℃/4h的规范下扩散焊,并在焊后按母材热处理制度进行固溶时效处理,可获得致密完整的DD3合金扩散焊接头,焊缝组织与母材类似,接头760℃和900℃拉伸强度达到母材性能指标,760℃和1040℃持久强度分别达到母材性能指标的90%和80%。还研究了扩散焊热循环对母材组织性能的影响,结果表明,DD3合金经1240℃/4h热循环后,再按母材标准热处理制度进行固溶时效处理,其组织和性能与标准热处理态完全相同。研究的DD3合金TLP扩散焊工艺可用于DD3合金实际叶片构件的连接。The single crystal superalloy DD3 was joined by TLP diffusion bonding with an interlayer alloy of XH4A,which was specially designed for DD3.Sound joints could be obtained by TLP diffusion bonding at 1 240 ℃/4 h and heat treatment according to heat treatment process of the base metal.The tensile strength of the joint at 760 ℃ and 900 ℃ can reach the level of the base metal.Its stress-rupture strength at 760 ℃ and 1 040 ℃ reach 90% and 80% of those of the base metal,respectively.The TLP diffusion bonding can be used to manufacture DD3 alloy turbine blades.

关 键 词：单晶合金 过渡液相扩散焊 拉伸性能 持久性能 

分 类 号：TG457.1[金属学及工艺—焊接]