| METALS AND METAL MATRIX COMPOSITES |
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| Effect of SIMA-imitated Brazing on the Microstructure and Shear Strength of Mn-Cu/430 Stainless Steel Joints |
| ZHANG Song, YANG Jing, XU Yonggang, ZHANG Mingyue
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| Key Laboratory of Advanced Technologies of Materials, Southwest Jiaotong University, Chengdu 610031, China |
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Abstract In this paper, Cu-Mn-Ni-Sn brazing filler metal was used to braze Mn-Cu alloy and 430 stainless steel (SS) by ordinary brazing (as-cast brazing filler metal, 850 ℃) and SIMA-imitated brazing process (rolled brazing filler metal, semi-solid temperature 790 ℃), respectively. The effects of brazing temperature on the microstructures, the formation of compounds and the mechanical properties of the joints were studied. In ordinary brazed joint, (Mn, Fe, Cr) solid solution diffusion layer was formed at the interface between stainless steel and brazing seam, however, cracks were formed at the interface between the diffusion layer and the brazing seam. The penetration of Sn-rich phase at grain boundaries of Mn-Cu alloy promoted the melting of alloy. The excessive dissolution of SS and partial melting of Mn-Cu alloy resulted in the formation of a large number of needle-like Mn-Cr-Cu-Fe compounds in the brazing seam. In SIMA-imitated brazed joint, the interface between stainless steel and brazing seam was well bonded. At the semi-solid temperature, the diffusion of filler metal to SS was decreased, and the dissolution of SS to filler metal was decreased as well. At the Mn-Cu alloy side, the penetration of Sn-rich phase along the grain boundaries was also effectively suppressed. Since the interaction between the substrates and filler metal was weaker, the amount of needle-like compounds decreased obviously in the brazing seam. In shear test, both brazed joints were broken in the distribution area of needle-like compounds in the brazing seam. The shear strength of ordinary brazed joint was 173 MPa, and that of SIMA-imitated brazed joint was 230 MPa.
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Published: 25 April 2020
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| Fund:This work was financially supported by the National Natural Science Foundation of China (11172248, 51701167), the Fundamental Research Funds for the Central Universities (2682017CX073). |
About author:: Song Zhangreceived his Ph.D. degree in material processing engineering from Northwest Polytechnic University in June 2016. He joined the Department of Me-tal Materials, School of Materials Science and Engineering, Southwest Jiaotong University in July of the same year. At present, he has presided over or conducted four projects including the National Natural Science Foundation of China, focusing on the research on refractory high-entropy alloys, damping alloys and their composites. He has published 8 papers in international journals such as Materials Science and Engineering: A and Intermetallics.
Jing Yangstudying for a Master’s degree in Southwest Jiaotong University from September 2016, she is focusing on the research of the brazing of dissimilar mate-rials.
Yonggang Xuprofessor and doctoral supervisor in the Department of Metal Materials, School of Materials Science and Engineering, Southwest Jiaotong University. He mainly engaged in the research and development of damping materials, focusing on the phase transformation and mechanical behavior of damping alloys, composite damping materials and the performance of dam-ping devices. He has published more than 20 papers in important journals at home and abroad and applied for more than 10 invention patents. |
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2020, Vol. 34 
