摘要
采用Fe-Si-B系非晶钎料,钎焊温度1 060℃,保温30 min,真空度优于4×10^(-3)Pa时可实现W-Cu合金的真空钎焊连接,并对钎焊界面的微观组织、显微硬度、弯曲强度、元素分布及物相组成等进行分析。结果表明,钎焊连接界面致密,钎缝基体为Cu,Si,B等在Fe中的固溶体相,钎缝新生相为Fe基体上分布细密的α-Fe(W)相。钎缝显微硬度高于两侧母材,钎缝中主要为α-Fe(W)及FeCu_4,Fe_(0.9)Si_(0.1)及Cu_3Si。W-Cu复合材料钎焊接头的抗弯强度达到482 MPa,断面表现为解理断裂与韧性断裂的复合断裂形态。韧性断裂主要发生于钎缝与Cu组元的结合部位,而解理断裂发生于钎缝与W相的结合部位。
Tungsten- copper(W-Cu) composite was brazed with Fe-Si-B filler metal in a vacuum furnace at brazing temperature of 1 060 ℃,holding time of 30 min and vacuum level superior to 4 × 10^(-3) Pa.And the microstructure,microhardness,bending strength,element distribution and phase constituents near interface of the brazed joint were investigated.Results indicated that the base phase in the brazed seam is Fe solid solution contained Cu,Si,B elements and the new phase is α-Fe(W) well distributed in Fe base phase.Microhardness in the brazed seam is higher than that of the base metals.Phase constituents in the brazed seam are α-Fe(W),FeCu_4,Fe_(0.9)Si_(0.1) and Cu_3Si.Four- point bending strength is 482 MPa,and the fracture appearance shows a mixed fracture type of cleavage fracture and ductile fracture.The ductile fracture occurs at the bonding area of the brazed seam and Cu phase in the W-Cu composite,while the cleavage fracture occurs at the bonding area of the brazing seam and W phase.
出处
《焊接》
北大核心
2014年第1期39-42,70,共4页
Welding & Joining
基金
江苏省自然科学基金资助项目(BK2012275)
关键词
W—Cu合金
真空钎焊
显微组织
弯曲强度
非晶钎料
tungsten-copper composite
vacuum brazing
microstructure
bending
amorphous filler metal
