THE EFFECT OF ARC MODE ON MICROSTRUCTURE AND MICROHARDNESS OF WIRE ARC ADDITIVE MANUFACTURING AL-5MG ALLOY
https://doi.org/10.57070/2304-4497-2023-4(46)-39-45
Abstract
Aluminum alloys have high corrosion resistance and weldability and are widely used in various manufacturing industries (aviation, automotive, shipbuilding). In this work, ER5356 welding wire with a diameter of 1.2 mm is used as a material for surfacing, and Al-5Mg alloys are manufactured by the method of wire-arc additive manufacturing based on cold metal transfer (WAAM-CMT) using three different welding arc modes (CMT, CMT-ADV, CMT-P). The study of the phase composition, microstructure and microhardness of Al-5Mg alloy samples was carried out. The results show that when using different arc modes, the diffraction patterns of α-Al differ significantly, and the main components of Al-5Mg alloys are α-Al and β-Al3Mg2. Two regions of microstructure are observed: the interlayer region (MSO) and the region of the inner layer (OAT), small columnar grains with pores and cracks are formed in the MSO, and large equiaxed grains are formed in the OAT. For all arc modes, the microhardness of the upper and lower regions of the sample is slightly greater than the average region. The microhardness of the sample produced according to the SMT-ADV mode (compared with the SMT and SMT-P modes) has the highest average value. This is mainly due to the fact that with a lower heat input, grains with the smallest size are formed (31.4–89.4 microns in MSO, 59.9–106.9 microns in OATS).
About the Authors
Chuanchu Su
Samara National Research University, Wenzhou University
Postgraduate student
Xizhang Chen
College of Mechanics and Electrical Engineering, Wenzhou University
PhD, Professor
Hu Hao
Samara National Re-search University
Postgraduate student
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Review
For citations:
Su Ch., Chen X., Hao H. THE EFFECT OF ARC MODE ON MICROSTRUCTURE AND MICROHARDNESS OF WIRE ARC ADDITIVE MANUFACTURING AL-5MG ALLOY. Bulletin of the Siberian State Industrial University. 2023;(4):39-45. (In Russ.) https://doi.org/10.57070/2304-4497-2023-4(46)-39-45
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