Investigation into Heat Treatment and Residual Stress in Laser Clad AA7075 Powder on AA7075 Substrate

被引：14
作者：
Cottam R. [1 ,5 ]
Luzin V. [2 ]
Liu Q. [3 ,5 ]
Wong Y.C. [1 ,5 ]
Wang J. [1 ]
Brandt M. [4 ,5 ]
机构：
[1] Industrial Laser Applications Laboratory, IRIS, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Melbourne, VIC
[2] ANSTO, Lucas Heights, NSW
[3] Defence Science and Technology Organisation, Fishermans Bend, VIC
[4] School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Bundoora, VIC, 3083
[5] Defence Materials Technology Centre, Hawthorn, VIC
来源：
Metallography, Microstructure, and Analysis | 2013年 / 2卷 / 04期
关键词：
AA7075; Laser cladding; Neutron diffraction; Residual stress;
D O I：
10.1007/s13632-013-0080-x
中图分类号：
学科分类号：
摘要：
The laser cladding of AA7075 powder onto a AA7075 substrate was conducted to evaluate the effect of heat treatment and to measure residual stress between the clad layer and substrate to better understand the effect of laser cladding. The microstructure formed in the clad region was characteristic of a high cooling rate, which is typical for laser cladding. The heat-affected zone (HAZ) showed coarser precipitates when compared with the substrate and was attributed to the heating from the laser. A solution heat treatment followed by aging was employed to restore the strength in the HAZ. Nanohardness traverses of the clad and substrate was performed and it was shown the hardness in the 7075 clad layer was lower than the substrate both pre- and post-heat treatment and was attributed to the vaporization of zinc and magnesium. Neutron diffraction was employed to measure the residual stress both before and after heat treatment. The residual stresses formed in the clad layer were tensile and about 50 MPa in magnitude; heat treatment increased the stress level to approximately 100 MPa. © 2013 Springer Science+Business Media New York and ASM International.
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页码：205 / 212
页数：7
相关论文
共 22 条
  • [1] Richter R.H., Orban S., Nowotny S., Laser cladding of the titanium alloy Ti6242 to restore damaged blades, Proceedings of the 23rd International Congress on Applications of Lasers and Electro-optics, (2004)
  • [2] Tabernero I., Lamikiz A., Martinez S., Ukar E., Figueras J., Evaluation of the mechanical properties of Inconel 718 components built by laser cladding, Int. J. Mach. Tools Manuf., 51, pp. 465-470, (2011)
  • [3] Chen J.Y., Conlon K., Xue L., Rogge R., Experimental study of residual stresses in laser clad AISI P20 tool steel on pre-hardened wrought P20 substrate, Mater. Sci. Eng. A, 527, pp. 7265-7273, (2010)
  • [4] Alam N., Extended service life and reliability for steam turbine components, Weld World, 53, SPEC. ISSUE, pp. 107-112, (2009)
  • [5] Frenk A., Vandyoussefi M., Wagniere J.-D., Zryd A., Kurz W., Analysis of the laser-cladding process for stellite on steel, Metall Mater Trans B, 28, pp. 501-508, (1997)
  • [6] Hemmati I., Ocelik V., De Hosson M.T.M., Microstructral characterisation of AISI 431 martensitic stainless steel laser deposited coatings, J. Mater. Sci., 46, pp. 3405-3414, (2011)
  • [7] Picasso M., Marsden C.F., Wagniere J.-D., Frenk A., Rappaz M., A simple but realistic model for laser cladding, Metall Mater Trans B, 25 B, pp. 281-291, (1994)
  • [8] Durandet Y., Brandt M., Liu Q., Challenges of laser cladding Al7075 alloy with Al-12Si alloy powder, (2004)
  • [9] Durandet Y., Deam R., Bendeich P., Ripley M., Brandt M., Liu Q., Baburamani P., Residual stress in Al7075 alloy plate laser clad with Al-12Si alloy powder, (2006)
  • [10] Durandet Y., Kallage P., Brandt M., Control of dilution during laser cladding of Al7075 substrates with Al-12%Si aluminium alloy powder, (2004)
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