基于三维CT图像的电弧增材制造高强AlCuMnZr合金的气孔缺陷及其控制研究

Study of porosity defect and Its controlling in WAAM of high-strength AlCuMnZr alloys based on 3D CT images

摘要: 研究了电弧增材制造（Wire and Arc Additive Manufacture,WAAM）高强AlCuMnZr合金的气孔缺陷形成机理及其控制方法。基于三维CT图像分析技术，对采用自然空冷（AC）、基板强制水冷（WC）及热等静压（HIP）后处理的薄壁件气孔缺陷分析。结果表明：AC/WC/HIP试样的气孔率分别为1.29%、1.21%、0.45%。HIP处理可有效降低气孔率并提升合金力学性能。基板自然空冷下WAAM成形AlCuMnZr合金经HIP处理后，抗拉强度、屈服强度和伸长率分别为（270±18）MPa、（150±8）MPa和（9±1）%。

Abstract: Pore defect formation mechanism and its control method of high-strength AlCuMnZr alloy fabricated by Wire and Arc Additive Manufacture（WAAM） were studied in this paper. Based on three-dimensional CT image analysis technology, the results of analyzing the porosity defects of thin-walled parts post-treated by natural air cooling（AC）, substrate-forced water cooling（WC） and hot isostatic pressing（HIP） show that the porosity of the WC/AC/HIP specimens are 1.29%, 1.21% and 0.45%, respectively, and that the HIP treatment can effectively reduce the porosity and improve the mechanical properties of the alloys. The tensile strength, yield strength and elongation of AlCuMnZr alloy formed by WAAM under natural air-cooling of the substrate after HIP treatment were（270±18）MPa,（150±8）MPa and（9±1）%, respectively.