Preparation of Rapidly Quenched Ni-Cr-B Alloy Ribbon and Its Weldability

Rapidly quenched Ni-Cr-B alloy ribbon was prepared by the rapidly quenched method using a single steel roll.By XRD,SEM and DSC methods,the microstructure,element distributions and temperature of solidus and liquidus of Ni-Cr-B alloy ribbon were studied respectively.The wettability of Ni-Cr-B alloy were investigated by use of surface tension instrument.The TLP bonding was carried out using Ni-Cr-B ribbon and the stress rupture life of the bonded specimen at 1 010℃/248 MPa were measured.The results show that the chemical compositions of Ni-Cr-B ribbon are homogeneous and its melting point is suitable to TLP bonding.The wettability of molten Ni-Cr-B alloy on Ni-based superalloy substrate is good.After TLP bonding,the stress rupture life at 1 010℃/248 MPa almost reaches that of the superalloy substrate.