| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Zn Interlayer on Friction Torque and Joint Interface Microstructure of Large Diameter Aluminum/Steel Continuous Drive Friction Welding |
| ZHANG Changqing1,2,*, CUI Guosheng2, CHEN Boyang2, LIU Xiao2, WANG Ye2, SHI Yu2
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1 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou 730050, China
2 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract Large section aluminum/steel composite structure usually need a long time of friction to make the interface metal from elastic-plastic state to viscoplastic state in the continuous drive friction welding process. The long time friction will lead to the formation of thick and uneven brittle Fe-Al intermetallic compounds at the weld of components, affecting the overall performance of the joint. The preset interlayer of aluminum/steel interface acts as a physical diffusion barrier in the friction welding process, hindering the mutual diffusion of Fe and Al atoms and inhibiting the formation of brittle Fe-Al intermetallic compounds. In this paper, Q235 low-carbon steel rods with/without Zn interlayer and 1060 pure aluminum rods were welded by continuous drive friction welding. The friction torque, temperature in the welding process and microstructure of interface after welding were analyzed. The experiment results show that the Zn interlayer can reduce the initial peak torque and peak temperature during welding and reduce the intermetallic compound thickness in the central region. The local maximum tensile strength and average tensile strength of the joint with Zn interlayer increases by 7.8% and 7% respectively. The Zn interlayer in the central region is extruded to the outer edge by friction pressure in the welding process, and Fe2Al5Zn0.4 with good toughness is formed in the region of R/2 from the center, and Zn element segregation exists in the region of 2R/3 from the center.
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Published: 25 October 2023
Online: 2023-10-19
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| Fund:National Natural Science Foundation of China (51961025). |
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2023, Vol. 37 
