CMT电弧增材制造的5356铝合金薄壁件力学性能及其强化机理研究  

Study on Mechanical Properties and Strengthening Mechanism of 5356 Aluminum Alloy Thin-walled Parts Prepared by CMT Arc Additive Manufacturing

作　　者：周陆琪 朱晓磊[1] 陆晓峰[1] 王健 ZHOU Luqi;ZHU Xiaolei;LU Xiaofeng;WANG Jian(School of Mechanical and Power Engineering,Nanjing University of Technology,Nanjing 211816,China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京211816

出　　处：《热加工工艺》2024年第3期33-38,42,共7页Hot Working Technology

摘　　要：采用CMT电弧增材制造了5356铝合金单道多层薄壁件,研究了5356铝合金薄壁构件的力学性能。并探讨不同电流情况下不同沉积高度的熔池形貌变化以及组织变化。结果表明,5356铝合金显微组织主要为α(Al)基体与β相,强化机理主要为细晶强化和析出相强化。5356铝合金组织和性能在不同沉积高度有差异。构件底部由于受到热循环更多,晶粒较为粗大,二次相较多且连续分布,而顶部受到热循环较少,晶粒相对细小且二次相主要呈点状析出。随着电流升高,薄壁构件力学性能逐渐降低。5356 aluminum alloy single pass multi-layer thin-walled parts were prepared by using CMT arc additive manufacturing,and the mechanical properties of the thin-walled parts were studied.And the molten pool morphology and microstructure evolution of different deposition height under different welding currents were studied.The results show that the microstructure of 5356 aluminum alloy is mainlyα(Al)matrix andβphase,and the strengthening mechanism is mainly fine grain strengthening and precipitation strengthening.The structure and properties of 5356 aluminum alloy are different at different heights.At the bottom of the part,due to more thermal cycles,the grains are relatively coarse,and the content of the secondary phase is higher and it shows continuous distribution,while at the top,due to less thermal cycles,the grains are relatively fine and the secondary phases are mainly precipitated in the form of points.As the current increases,the mechanical properties of the thin-walled part gradually decreases.

关 键 词：5356铝合金 CMT电弧增材制造 显微组织 力学性能 

分 类 号：TG444.74[金属学及工艺—焊接]