脉冲电流强度对TIG增材制造2219铝合金显微组织与拉伸性能的影响
Effect of Pulse Current Intensity on Microstructure and Tensile Properties of 2219 Aluminum Alloy by TIG Additive Manufacturing
摘 要
利用钨极氩弧焊（TIG）增材制造技术在无脉冲、弱脉冲和强脉冲交流电下制备2219铝合金，研究了脉冲电流强度对铝合金显微组织和拉伸性能的影响。结果表明：无脉冲、弱脉冲及强脉冲TIG增材制造铝合金试样的显微组织一致，主要由基体相α（Al）与第二相θ（Al2Cu）构成，堆积体中部区域均为等轴晶；相比无脉冲电流工艺，弱脉冲和强脉冲电流下制备的试样晶粒尺寸更小更均匀；无脉冲、弱脉冲及强脉冲TIG增材制造铝合金试样均表现为弱织构，最大密度仅为3.42，脉冲电流强度对晶粒取向无明显作用；经T6热处理后，相比于无脉冲电流工艺，强脉冲电流下制备的试样在扫描方向的抗拉强度降低，增材方向的抗拉强度提高，整体各向异性减轻。
脉冲电流强度
2219铝合金
氩弧焊
arc additive manufacturing
pulse current intensity
2219 aluminum alloy
argon arc welding
Abstract
The 2219 aluminum alloy was prepared by tungsten inert gas welding (TIG) additive manufacturing with non-pulse, weak pulse and strong pulse alternating currents, and the effect of pulse current intensity on the microstructure and tensile properties of the aluminum alloy was studied. The results show that the microstructures of the aluminum alloy specimens fabricated by non-pulse, weak pulse and strong pulse TIG additive manufacturing were the same, mainly consisting of matrix phase α(Al) and second phase θ(Al2Cu), and the central region of the accumulation body was composed of equiaxed crystal. Compared with that under non-pulse current, the grain size of the specimens under weak pulse and strong pulse currents was smaller and more uniform. The aluminum alloy specimens fabricated by non-pulse, weak pulse and strong pulse TIG additive manufacturing all showed weak texture, and the maximum density was only 3.42. The pulse current intensity had no obvious effect on the grain orientation. After T6 heat treatment, compared to those under non-pulse current, the tensile strength of the specimens prepared under strong pulse current in the scanning direction decreased, while in the additive direction increased, and the overall anisotropy was reduced.
中图分类号 TG444 TG455 DOI 10.11973/jxgccl202309002
所属栏目 试验研究
基金项目 航空科学基金资助项目（2018ZE52058）
收稿日期 2022/7/3
修改稿日期 2023/7/6
网络出版日期
作者单位点击查看
备注邓威(1998-),男,河南安阳人,硕士研究生
引用该论文: DENG Wei,WU Yong,WU Rubo,XIAO Jianye. Effect of Pulse Current Intensity on Microstructure and Tensile Properties of 2219 Aluminum Alloy by TIG Additive Manufacturing[J]. Materials for mechancial engineering, 2023, 47(9): 6～13
邓威,武永,吴汝波,肖剑烨. 脉冲电流强度对TIG增材制造2219铝合金显微组织与拉伸性能的影响[J]. 机械工程材料, 2023, 47(9): 6～13
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【3】杨家典, 康明, 刘君, 等.2219铝合金大型异形环锻件轧制及胀形工艺研究[J].金属加工(热加工), 2022(3):75-77. YANG J D, KANG M, LIU J, et al.Study on rolling and bulging process of 2219 aluminum alloy large special-shaped ring forgings[J].MW Metal Forming, 2022(3):75-77.
【4】WU B T, PAN Z X, DING D H, et al.A review of the wire arc additive manufacturing of metals:Properties, defects and quality improvement[J].Journal of Manufacturing Processes, 2018, 35:127-139.
【5】SZOST B A, TERZI S, MARTINA F, et al.A comparative study of additive manufacturing techniques:Residual stress and microstructural analysis of CLAD and WAAM printed Ti-6Al-4V components[J].Materials & Design, 2016, 89:559-567.
【6】ASCARI A, FORTUNATO A, ORAZI L, et al.The influence of process parameters on porosity formation in hybrid laser-GMA welding of AA6082 aluminum alloy[J].Optics & Laser Technology, 2012, 44(5):1485-1490.
【7】BAI J Y, YANG C L, LIN S B, et al.Mechanical properties of 2219-Al components produced by additive manufacturing with TIG[J].The International Journal of Advanced Manufacturing Technology, 2016, 86(1):479-485.
【8】BAI J Y, FAN C L, LIN S B, et al.Mechanical properties and fracture behaviors of GTA-additive manufactured 2219-Al after an especial heat treatment[J].Journal of Materials Engineering and Performance, 2017, 26(4):1808-1816.
【9】LI H, ZOU J S, YAO J S, et al.The effect of TIG welding techniques on microstructure, properties and porosity of the welded joint of 2219 aluminum alloy[J].Journal of Alloys and Compounds, 2017, 727:531-539.
【10】AHMED N.Direct metal fabrication in rapid prototyping:A review[J].Journal of Manufacturing Processes, 2019, 42:167-191.
【11】EFTEKHAR A H, SADROSSADAT S M, REIHANIAN M.Effect of heat input on microstructure and mechanical properties of TIG-welded semisolid cast AXE622 Mg alloy[J].Materials Characterization, 2022, 184:111692.
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【17】BAI J Y, FAN C L, LIN S B, et al.Effects of thermal cycles on microstructure evolution of 2219-Al during GTA-additive manufacturing[J].The International Journal of Advanced Manufacturing Technology, 2016, 87(9):2615-2623.
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【19】武永, 邓威, 刘恺, 等.层间超声冲击对TIG电弧增材制造2219铝合金组织和力学性能的影响[J].航空科学技术, 2021, 32(11):80-86. WU Y, DENG W, LIU K, et al.Effect of interlayer ultrasonic peening on the microstructure and mechanical properties of 2219 aluminum alloy by TIG wire arc additive manufacturing[J].Aeronautical Science & Technology, 2021, 32(11):80-86.
【20】柏久阳, 范成磊, 杨雨晨, 等.2219铝合金TIG填丝堆焊成形薄壁试样组织特征[J].焊接学报, 2016, 37(6):124-128. BAI J Y, FAN C L, YANG Y C, et al.Microstructures of 2219-Al thin-walled parts produced by shaped metal deposition[J].Transactions of the China Welding Institution, 2016, 37(6):124-128.
【21】HUAN P C, WANG X N, ZHANG J, et al.Effect of wire composition on microstructure and properties of 6063 aluminium alloy hybrid synchronous pulse CMT welded joints[J].Materials Science and Engineering:A, 2020, 790:139713.
【22】WANG Q T, WANG X N, CHEN X M, et al.Interactive effects of porosity and microstructure on strength of 6063 aluminum alloy CMT MIX + Synchropulse welded joint[J].Transactions of Nonferrous Metals Society of China, 2022, 32(3):801-811.
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