Abstract
The overlap joints of aluminum alloy 5754 and galvanized advanced high strength steel (AHSS) are prepared by the laser welding-brazing technique. The microstructure in each characteristic zones of aluminum alloy 5754-AHSS dissimilar welded joint is observed. The α-Al is the main microstructure in the weld metal (WM), and Al–Si eutectics distributed in the grain boundary are also found. The microstructure of AHSS base metal (BM) is determined as martensite and ferrite. The tensile test results show that the aluminum alloy 5754-AHSS dissimilar welded joint fractured in the aluminum alloy BM with tensile strength of 238.4 MPa. The suitable thickness of the intermetallic compound (IMC) layer makes the BMs effectively bonded and difficult to initiate cracks. Thus, the formation of the continuous IMC layer is regarded as the main factor to improve the mechanical properties of the overlap joint.
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This work is supported by the National Natural Science Foundation of China (Grant no. 52071193).
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Hu, T., Li, Z., Dong, W., Ding, K., Gao, Y. (2023). Study on the Microstructure and Mechanical Properties of Aluminum Alloy 5754 to Advanced High Strength Steel by the Laser Welding-Brazing Technique. In: TMS 2023 152nd Annual Meeting & Exhibition Supplemental Proceedings. TMS 2023. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-22524-6_41
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