不锈钢/铜感应钎焊接头组织和力学性能研究  

Study on Microstructure and Mechanical Properties of Stainless Steel and Copper Induction Brazed Joint

作　　者：陈湘平[1] 唐杰[2] 卫国强[2] 王琪莹[3] 

机构地区：[1]广州番禺职业技术学院珠宝学院,广东广州511483 [2]华南理工大学机械与汽车工程学院,广东广州510641 [3]广州大学化学化工学院,广东广州510006

出　　处：《热加工工艺》2017年第23期229-231,234,共4页Hot Working Technology

摘　　要：采用Cu-Zn钎料感应钎焊不锈钢/铜接头,并利用金相显微镜、扫描电镜、显微硬度计和万能拉伸试验机对钎焊接头的显微组织和力学性能进行了分析。结果显示:钎焊后钎料/不锈钢界面的形貌由一层化合物、沿晶界生长的针状金属间化合物及向晶内生长的二次树枝晶金属间化合物组成。在远离界面的钎料内部还有金属间化合物沿晶界析出。近钎缝区的铜显微硬度明显降低,不锈钢侧硬度降低不明显,钎缝的显微硬度明显增加,这是由于较快的冷却速度导致黄铜钎料出现大量的Cu Zn相。钎焊接头拉伸断口位于远离钎缝的铜管上,抗拉强度达到260 MPa,显示出良好的力学性能。The stainless steel and copper joint was welded by using induction brazing method with Cu-Zn solder. The microstructure and mechanical properties of the brazed joint were analyzed by metallographic microscope, scanning electron microscope, microhardness tester and tensile testing machine. The results show that the morphology 0fthe solder and stainless steel interface after brazing is composed of a layer of compound, acicular intermetallic compounds along the grain boundary, and the second dendritic intermetallic compounds along the crystal. The intermetallic compounds precipitate along the grain boundaries in solder far from the interface. The microhardness of Cu near the brazing seam decreases dramatically, the microhardness decrease at the stainless steel side is not obvious, and the brazing seam＇s microhardness increases significantly. This is due to that the fast cooling rate leads to the emergence of a large number CuZn phases in brass solder. The tensile fracture of brazed joint is located at the copper pipe far away from the brazing seam. The tensile strength of the joint reaches 260 MPa, which shows good mechanical properties.

关 键 词：Cu-Zn钎料 感应钎焊 空调配管 显微组织 力学性能 

分 类 号：TG454[金属学及工艺—焊接]