Vol.4 No.5 (September 2014)
Study of Zr-Ti-Ni-Cu Amorphous Brazing Fillers Applied to Brazing Titanium TA2 and Q235 Steel
When brazing temperature is higher than 882.5˚C, titanium TA2 translates from α phase to β phase, whose microstructure is coarsened and the joint properties is decreased. For this issue, the compositions of brazing fillers were optimized by using orthogonal experiment and two kinds of Zr-Ti-Ni-Cu amorphous brazing fillers with lower melting temperatures were obtained in this paper. Filler foils were prepared by using rapid solidification apparatus and high frequency induction brazing of TA2 and Q235 were conducted. The results show that, amorphous brazing fillers Zr52Ti22Ni18Cu8 and Zr52Ti24Ni16Cu8 optimized by using orthogonal experiment, whose fully melting temperature is lower than 800˚C, totally satisfying the brazing temperature requirement that no phase transformation of TA2 occurs. The brazing joint is consisted of three parts: the brazing zone, the reaction layer of brazing seam and base metal TA2, and the bonding layer of brazing seam and base metal Q235. The microstructures of brazing seam are coarse Ti(Fe, Zr) solid solution dendrites with stronger orientation. Reaction layer is existed between brazing seam and base metal TA2, and the microstructures of the bonding layer of brazing seam and base metal Q235 are metastable compounds formed by Fe, C, Ti. When brazing parameters are temperature 800˚C, heating current 25 A, heating time 15 s and holding time 15 s, the shear strength of the joint obtained is up to 149 MPa.
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