Development of Low Silver AgCuZnSn Filler Metal for Cu/Steel Dissimilar Metal Joining

Metals - Tập 9 Số 2 - Trang 198
Peng Xue1, Yang Zou1, Peng He2, Yinyin Pei3, Huawei Sun3, Chaoli Ma4, Jingyi Luo5
1School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China
3State Key Laboratory of Advanced Brazing Filler Metals & Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001, China
4College of Materials Science and Technology, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China
5Jinhua Jinzhong Welding Materials Co., Ltd., Jinhua 321016, China

Tóm tắt

The microstructure and properties of a Cu/304 stainless steel dissimilar metal joint brazed with a low silver Ag16.5CuZnSn-xGa-yCe braze filler after aging treatment were investigated. The results indicated that the addition of Ce could reduce the intergranular penetration depth of the filler metal into the stainless steel during the aging process. The minimum penetration depth in the Ag16.5CuZnSn-0.15Ce brazed joint was decreased by 48.8% compared with the Ag16.5CuZnSn brazed joint. Moreover, the shear strength of the brazed joint decreased with aging time while the shear strength of the AgCuZnSn-xGa-yCe joint was still obviously higher than the Ag16.5CuZnSn joint after a 600 h aging treatment. The fracture type of the Ag16.5CuZnSn-xGa-yCe brazed joints before aging begins ductile and turns slightly brittle during the aging process. Compared to all the results, the Ag16.5CuZnSn-2Ga-0.15Ce brazed joints show the best performance and could satisfy the requirements for cost reduction and long-term use.

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Metals

Tập 9 Số 2

198

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