Effect of Deep Cryogenic Treatment on Microstructure of 5A06 Aluminum Alloy MIG Welded Joint

Abstract:

5A06 aluminum alloy welding was obtained by using SAlMg-3 as welding wire with MIG (metal inert gas arc welding). The welded joint with deep cryogenic treatment at liquid nitrogen temperature (-155) for 4h, 8h, 10h were analyzed by metallographic and XRD examination. The results have shown that a lot of subgrain appears in the microstructure of the welded joint resulting in the refined grain after cryogenic treatment. The obvious increasing in content of β-phase (Mg₂Al₃) is distributed and dispersed evenly, contributed to dispersion strengthening of the welded joint. Meanwhile, orientation phenomena is obtained for some grain after deep cryogenic treatment. As a result, the microstructure of the joint can be modified by the deep cryogenic treatment.

• Periodical: Materials Science Forum (Volume 724)
• Pages: 182-185
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.724.182
• Online since: June 2012
• Authors: Shan Gao, Zhi Sheng Wu, Peng Fei Jin, Jun Jie Wang, Peng Shuai
• Keywords: 5A06 Aluminum Alloy, Deep Cryogenic Treatment, Microstructure, Welded Joint

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