电弧定向能量沉积修复5083铝合金的力学性能与耐蚀性评估

    Mechanical Properties and Corrosion Resistance Evaluation of Arc Directed Energy Deposition Repaired 5083 Aluminum Alloy

    • 摘要: 针对在5083铝合金应用中的损伤问题与修复需求,使用电弧定向能量沉积技术修复模拟的表面损伤及贯穿损伤。通过拉伸试验与盐雾腐蚀试验评价了电弧定向沉积表面和贯穿损伤修复接头的力学性能与耐蚀性。通过金相显微镜与扫描电子显微镜观察分析了母材组织与损伤修复接头组织的形貌差异与元素差异。结果表明:表面、贯穿损伤修复接头的抗拉强度分别达到母材的91.2%、89.6%,且修复组织在酸性盐雾腐蚀环境下具有良好的耐蚀性。影响电弧定向沉积修复接头性能的主要因素是修复区组织中的气孔,第二相增多与晶粒尺寸变大也会降低修复接头的性能。

       

      Abstract: To address the damage problems and repair demands in 5083 aluminum alloy application, arc directed energy deposition (ADED) technology was used to repair simulated surface damage and through-thickness damage. The mechanical properties and corrosion resistance of the surface and through-thickness damage repaired joints were evaluated through tensile test and salt spray corrosion test. Metallographic microscopy and scanning electron microscopy (SEM) were utilized to observe and analyze morphological and elemental differences between the base material and the damage repaired joints. The results show that the tensile strength of the surface, through-thickness damage repaired joints achieves 91.2%,89.6% of the base material's tensile strength, and the repaired microstructure demonstrates excellent corrosion resistance in acidic salt spray environments. The main factor affecting the performance of arc directed deposition repaired joints is the porosity in the microstructure of the repaired area. An increase of secondary phases and grain size also reduces the performance of the repaired joints.

       

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