铝合金的激光熔覆修复

郭永利; 梁工英; 李路

中国激光, 2008, 35 (2): 303, 网络出版: 2008-03-05

铝合金的激光熔覆修复

Laser Cladding Reparation of Aluminum Alloy

论文大纲

郭永利 ^*梁工英李路

作者单位

西安交通大学理学院, 陕西西安 710049

激光技术激光熔覆修复显微组织铝合金 laser technique laser cladding repairing microstructure Al alloy

摘要

通过对航空航天用超高强7050铝合金进行激光熔覆修复的实验研究,探讨了激光熔覆修复铝合金的可行性。实验采用5 kW CO2连续激光器作为加热源,在惰性气体保护隔离箱中,对7050铝合金的板状试样进行了激光单道熔覆、多道搭接熔覆、多层堆积熔覆的实验研究。得到优化的激光熔覆工艺参数,制备了激光熔覆修复试样,并观察了不同激光熔覆区的微观组织以及拉伸断口形貌。实验结果表明,优化激光熔覆工艺参数是：激光功率密度为1.84×104～2.12×104 W/cm2,扫描速度为5 mm/s,送粉量为1.8～2.4 g/min,搭接宽度为1.5 mm。采用优化工艺参数熔覆,基底和熔覆区形成良好的冶金结合,熔覆后工件表面平整且基底没有变形。同时,采用干燥的氩气加强对激光熔池的保护可以有效消除铝合金激光熔覆中的缺陷。

Abstract

Experiment of repairing aluminum (Al) alloy 7050 (Al 7050) by laser-cladding techniques was investigated. A 5 kW CO2 laser was used as the heat source. Experiemnts of single trace cladding, multi-trace overlapping cladding, and multi-layer cladding were performed on the Al 7050 plates shielded in a closed box with inert gas. A set of optimized laser-cladding repairation parameters for damaging Al 7050 samples were found, and the microstructures in different cladding regions and micro-appearances of fracture surface were studied. The optimized laser-cladding repairation parameters were laser power of 1.84×104～2.12×104 W/cm2, scanning speed of 5 mm/s, powder feeding rate of 1.8～2.4 g/min, and overlapping width of 1.5 mm. With the optimized repairing parameters, the cladding zone displayed a superior metallurgical bonding with its substrate, the repaired sample surface appeared smooth without any substrate distortion, and the defect formation in the cladding zone was effectively prevented by strengthening shielding of the molten pool with dry argon.

参考文献

[1] Leo Sexton. Laser cladding: repairing and manufacturing metal parts and tools [C]. SPIE, 2003, 4876:462～469

[2] . . Rebuilding of metal components with laser cladding forming[J]. Applied Surface Science, 2006, 252(22): 7934-7940.

[3] . . A study on fusion repair process for a precipitation hardened IN738 Ni-based superalloy[J]. Journal of Engineering for Gas Turbines and Power, 2000, 122(3): 457-461.

[4] . Sexton, S. Lavin, G. Byrne et al.. Laser cladding of aerospace materials[J]. Journal of Materials Processing Technology, 2002, 122(1): 63-68.

[5] . . The resistance to wear and corrosion of laser-cladding Al2O3 ceramic coating on Mg alloy[J]. Applied Surface Science, 2007, 253: 5306-5311.

[6] . Grum, J. M. Slabe. A comparison of tool-repair methods using CO2 laser surfacing and arc surfacing[J]. Applied Surface Science, 2003, 208: 424-431.

[7] E. Capello, D. Colombo, B. Previtali. Repairing of sintered tools using laser cladding by wire [J]. Journal of Materials Processing Technology, 2005, 164-165:990～1000

[8] . . Investigation of a 3D non-contact measurement based blade repair integration system[J]. Aircraft Engineering and Aerospace Technology: An International Journal, 2005, 77(1): 34-41.

[9] . Worn area modeling for automating the repair of turbine blades[J]. Int. J. Adv. Manuf. Technol., 2006, 29: 1062-1067.

[10] . Application of laser cladding in aviation industry[J]. Aviation Precision Manufacturing Technology, 2007, 43(1): 37-40.

[11] Liu Hongbin, Wang Cunshan, Gao Yali et al.. Laser cladding amorphous composite coating of Cu-Zr-Al on magnesium alloy surface [J]. Chinese J. Lasers, 2006, 33(5):709～713
刘红宾,王存山,高亚丽等. 镁合金表面激光熔覆Cu-Zr-Al非晶复合涂层[J]. 中国激光, 2006, 33(5):709～713

[12] Niu Xin, Chao Mingju, Wang Wenli et al.. In situ synthesized NbC particulate reinforced Ni-based composite coatings by laser cladding [J]. Chinese J. Lasers, 2006, 33(7):987～992
牛薪,晁明举,王文丽等. 原位生成NbC颗粒增强镍基激光熔覆层[J]. 中国激光, 2006, 33(7):987～992

[13] Huang Kaijin, Lin Xin, Li Chaowu et al.. Microstructure and wear behavior of laser cladding Zr-based composite coatings on AA7075 aluminum alloy [J]. Applied Laser, 2006, 26(6):398～401
黄开金,林鑫,李朝武等. AA7075铝合金表面激光熔覆Zr基复合涂层的组织与磨损行为[J]. 应用激光, 2006, 26(6):398～401

[14] Li Junchang. Diffraction of Laser and Calculation on Thermal Acting [M]. Beijing: Sience Press, 2002. 486
李俊昌. 激光的衍射及热作用计算[M]. 北京：科学出版社, 2002. 486

郭永利, 梁工英, 李路. 铝合金的激光熔覆修复[J]. 中国激光, 2008, 35(2): 303. Guo Yongli, Liang Gongying, Li Lu. Laser Cladding Reparation of Aluminum Alloy[J]. Chinese Journal of Lasers, 2008, 35(2): 303.

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