Preparation and welding performance of amorphous interlayer alloys for TLP bonding

The composition and phase selection of Ni-Si-B amorphous interlayer alloys for transient liquid phase(TLP) bonding of 16Mn steel have been investigated.The TLP bonding experiment of 16Mn steels was conducted by a Gleeble-3500 thermal simulation testing machine, and the welding performance of the interlayer alloys, the interface microstructure and joint properties were analyzed.The results indicate that the amorphous Ni-6.8Si-(3-5) B interlayer alloys performs an excellent wettability and spreadability during TLP bonding.The joint gap is filled soundly and interfacial microstructure is uniform, which has no coarsening evidence compared with base metal.Under the experimental condintions of axial compressive load 10 MPa, temperature rising rate 50℃/s, bonding temperature 1 150℃, holding time 5 min., the joint bending angle reaches to 90°.Using amorphous Ni-based interlayer alloys can realize the higher strength TLP bonding of 16Mn steels.