(1. 南京航空航天大學(xué) 材料科學(xué)與技術(shù)學(xué)院，南京 211106；
2. 南京工程學(xué)院 材料工程學(xué)院，南京 211167；
3. 江蘇科技大學(xué) 先進焊接技術(shù)省級重點實驗室，鎮(zhèn)江 212003)
摘 要: 采用Cu-5Ni(質(zhì)量分數(shù)，%)合金箔為中間層，在加壓15 MPa、連接溫度1 120 ℃、保溫10~360 min的工藝條件下對純鎢/316L不銹鋼進行瞬間液相擴散連接。利用OM、SEM、EDS和電子萬能試驗機等研究接頭的微觀組織、成分分布、力學(xué)性能及斷口特征。結(jié)果表明：保溫10和30 min對應(yīng)的接頭組織由分界明顯的富鐵層和富銅層兩層構(gòu)成；保溫時間增至180 min時，接頭組織中的富銅層變薄、變分散，而富鐵層則變厚、且局部和不銹鋼奧氏體晶粒粘接；當保溫時間達到360 min后，接頭區(qū)和不銹鋼母材較好地實現(xiàn)了組織與成分均勻化，鎢母材中則形成2~3 µm厚的Cr、Fe元素擴散帶，接頭抗剪強度達到213 MPa，斷裂失效主要發(fā)生在鎢母材中。
關(guān)鍵字: 鎢；不銹鋼；瞬間液相擴散連接；抗剪強度
（1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,
Nanjing 211106, China;
2. School of Materials Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
3. Provincial Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology,
Zhenjiang 212003, China）
Abstract:Transient liquid phase bonding between tungsten (W) and stainless steel 316L using a Cu-5Ni (mass fraction, %) alloy interlayer was carried out in vacuum at 1 120 ℃ for 10−360 min with a pressure of 15 MPa. The microstructures, composition distribution and fracture characteristics of the joints were studied by OM, SEM, EDS and their mechanical properties were tested by shear experiments. The results show that the microstructures of the joints holding for 10 and 30 min consist of Fe-rich layer and Cu-rich layers with clear boundaries. When the holding time increases to 180 min, Cu-rich layer becomes thin and disperse, while Fe-rich layer becomes thick and part of it bonds to the stainless steel austenite grain. When the holding time reaches 360 min, the microstructure and composition of bonding zone become homogenous, and 2−3 µm-thick Cr, Fe elements diffuse band also forms in the tungsten matrix. The average shear strength of joints holding for 360 min reaches 213 MPa, and the fracture failure occurs mainly in the tungsten matrix.
Key words: tungsten; stainless steel; transient liquid phase bonding; shear strength
