Effects of Rolling and Hot Isostatic Pressing on the Microstructure and Properties of Resistance Seam Welded Additive Al 1060
CHEN Hong1, WANG Wenqin1, CHEN Jie2,*, LAI Hao1, CHEN Jigen1, GUO Yijie1, ZHOU Yeping2
1 School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China 2 Special Equipment Inspection and Testing Institute, Jiangxi Inspection, Testing and Certification General Institute, Nanchang 330029, China
Abstract: Resistance seam additive manufacturing (RSAM) is a solid-state additive technique based on the coupled effects of resistive heating and pressure, which enables near-net-shape fabrication of bulk materials through layer-by-layer welding of metal powders. It offers notable advantages in lightweighting and production efficiency for complex components. In this study, Al 1060 powder was used as the starting material to fabricate as-deposited (R0) samples via RSAM. A subset of these samples was subsequently processed by rolling, yielding the R10 samples. Both R0 and R10 samples were then subjected to hot isostatic pressing (HIP) at temperatures of 500 ℃ and 580 ℃. The synergistic effects of rolling and HIP on microstructural evolution and mechanical properties were systematically investigated. The results indicate that rolling significantly reduces the initial porosity of the manufactured parts and introduce a high density of dislocations through plastic deformation, thereby providing a microstructural foundation for subsequent densification and grain refinement. HIP further promotes pore closure and activates dynamic recrystallization. Through the combined treatment, the porosity of the R10-500 sample was reduced from 0.998% to 0.028%, while the average grain size was refined to 2.92 μm. Moreover, the ultimate tensile strength and elongation reached 96.1 MPa and 31%, respectively, representing increases of 51.34% and 588.89% compared to the R0 sample. This demonstrates a simultaneous enhancement in both strength and ductility. The findings provide valuable theoretical insight into microstructural optimization and performance control of aluminum alloy components produced by RSAM.
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