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Erschienen in: Metallography, Microstructure, and Analysis 4/2013

01.08.2013 | Technical Article

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

verfasst von: R. Cottam, V. Luzin, Q. Liu, Y. C. Wong, J. Wang, M. Brandt

Erschienen in: Metallography, Microstructure, and Analysis | Ausgabe 4/2013

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Abstract

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.

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Metadaten
Titel
Investigation into Heat Treatment and Residual Stress in Laser Clad AA7075 Powder on AA7075 Substrate
verfasst von
R. Cottam
V. Luzin
Q. Liu
Y. C. Wong
J. Wang
M. Brandt
Publikationsdatum
01.08.2013
Verlag
Springer US
Erschienen in
Metallography, Microstructure, and Analysis / Ausgabe 4/2013
Print ISSN: 2192-9262
Elektronische ISSN: 2192-9270
DOI
https://doi.org/10.1007/s13632-013-0080-x

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