低合金化镁合金熔化焊接组织调控的研究进展

Abstract

摘要：低合金化镁合金因其可加工性好、耐蚀性优异和成本低等优势，成为变形镁合金发展的重要趋势之一。焊接连接已成为推广应用这类材料的关键。然而，低合金化镁合金在焊接过程中存在焊缝晶粒粗大、有效强化相较少等组织软化问题，导致焊接强度不匹配等。本文基于镁合金焊接冶金学的相关理论，重点总结了调控低合金化镁合金焊缝组织的方法，并系统论述了焊缝组织演变过程和机理。最后，针对这类合金在焊接方面的应用需求，对该领域的发展趋势进行了展望。

Due to its advantages, such as good formability, excellent corrosion resistance and low cost, low-alloyed Mg alloys have become one of the important trends in the development of wrought Mg alloys. Welding has become a key method for the widespread application of these materials. However, low-alloyed Mg alloys face the challenges in welding, such as coarse grain structure in the fusion zone and insufficient strengthening phases,leading to mismatched welding strength. This paper, based on relevant theories of Mg alloy welding metallurgy,summarized the methods for controlling the microstructure of low-alloyed magnesium alloy welds, and systematically discussed the evolution process and mechanism of weld microstructure. Finally, in response to the application demands of these alloys in welding, the development trends in this field were prospected.