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- 저자 : A. Queiros (검색결과 1 건)
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R. Beygi,R. Carbas,A. Queiros,E. A. S. Marques,R. Shi,L. F. M. da Silva 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
Steel (St) and aluminum (Al) have a high affinity to each other and form intermetallic compounds (IMCs) when bonded byfriction stir welding (FSW). Understanding the effect of alloying elements of steel on the formation of IMCs will help todesign joints in which the formation of IMCs is controlled. In this study, two kinds of steel, carbon steel (CS) and austeniticstainless steel (SS) with 3 mm thickness, were selected to be welded to aluminum by FSW under similar conditions. Theeffect of the rotation speed of the FSW tool was also examined in the range of 850–1300 RPM. The morphology, thickness,and composition of IMCs in the interfaces were studied by various characterization techniques. It was observed that theIMC layers in the SS/Al joints were much thinner than the ones in CS/Al joints (0.1–0.7 μm in SS/Al and 2–6 μm in CS/Al). Moreover, the thickness of IMC layer in CS/Al joints increased with increasing the rotation speed while in SS/Al jointsit began to decline by exceeding a certain rotation speed. In order to explain these differences, diffusion-based equationswere used to calculate the interdiffusion coefficients in both SS/Al and CS/Al couples. It was found that the interdiffusioncoefficient in SS/Al was lower than CS/Al. This was attributed to the alloying elements of SS such as Ni and Cr which candiffuse to IMC layer and hinder the growth rate of IMCs. It was also observed that some form of liquation occurred in SS/Al joints at high rotation speed of FSW due to the formation of a low-melting multielement compound of Al–Fe–Cr–Ni. The decline of IMC thickness in SS/Al joints at high rotation speed was attributed to this multielement compound whichwas melted during FSW and reduced the nucleation rate of Al–Fe IMCs. Finally, the fracture of the specimens and the effectof IMC formation on the joint establishment were elaborated. It was concluded that the alloying elements of steel have abeneficial effect on controlling the growth of IMCs.
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