TITLE:
Zr-Ti-Ni-Cu Amorphous Brazing Fillers Applied to Brazing Titanium TA2 and Q235 Steel
AUTHORS:
Jie Cui, Qiuya Zhai, Jinfeng Xu, Yahui Wang, Jianlin Ye
KEYWORDS:
Titanium/Steel Brazing, Amorphous Brazing Filler, Joint Microstructure, Shear Strength
JOURNAL NAME:
Materials Sciences and Applications,
Vol.5 No.11,
September
29,
2014
ABSTRACT: Ti-Zr-Cu-Ni amorphous
filler with good performance is suitable for joining TC and TB titanium alloy,
but its melting temperature is higher than 882.5°C, the α→β phase transition
temperature of TA2, which makes the ductility of TA2 fall and the
microstructure of the joint coarse. In this paper, Ti-Zr-Cu-Ni amorphous filler was redesigned and optimized by using
orthogonal experiment to obtain three easy-to-use Zr-Ti-Ni-Cu amorphous fillers
with low melting points and good plasticity. The fast cooling equipment was
used to fabricate the brazing filler foils to implement the braze welding of
TA2 and Q235 with high frequency inductance. The results indicate that all the brazing foils are amorphous structure with lower
melting temperature, for example, Zr52Ti22Ni18Cu8 filler’s is 538°C. The
technical parameters in brazing welding are: welding temperature T = 800°C;
heating electric current I =25 A;
heating time t = 15 s and holding time t = 15 s, in the case of these
conditions, the jointing head shear strength of TA2/Zr52Ti24Ni13Cu11/Q235 is
139 MPa. Fracture is mainly located in the brazing seam. The white brittle
intermetallic TiFe, TiFe2 and enhancement TiC spread in the center zone of
brazing seam.