Study on the Effect of Nickel Interlayer Addition on the Interface Microstructure and Properties of Titanium/Steel Metal Composites Fabricated by Wire and Laser Additive Manufacturing
Aiming at the problem that brittle Ti-Fe intermetallic compounds are easily formed in the additive manufacturing process of titanium/steel composites,which deteriorates the interface properties.In this paper,nickel(ERNi-1)was selected as the interlayer,and the integrated preparation of TC4/309L composites was realized by laser fuse additive manufacturing technology.The effect of Ni interlayer addition on the microstructure and properties of the interface was analyzed.The results show that:The interface of TC4/309L composites with Ni interlayer is mainly composed of Fe/Ni interface and Ti/Ni interface.For the Fe/Ni interface,Fe and Ni form an infinite solid solution,and no obvious defects such as cracks and pores are found,achieving a good metallurgical bonding.The Ti/Ni interface contains TiFe,TiNi3,TiNi,Ti2Ni and other brittle intermetallic compounds,and the maximum hardness of the interface reaches 670.1 HV.The micro-area tensile test of the interface bonding strength shows that the bonding strength is 30.5 MPa,and it breaks at the Ti/Ni interface,showing brittle fracture characteristics.
wire and laser additive manufacturingTC4/309L compositesNi interlayerintermetallic compoundorganizationmechanical properties
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