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Repair and manufacturing of single crystal Ni-based superalloys components by
laser powder deposition—A review
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deposition is one of the most promising methods for the repairing of the single crystal Ni-based
superalloys components used in the hot-section of gas turbine engines in order to extend
their lifetime and reduce their overall cost. The microstructure of Ni-based
superalloys deposited on single
crystal substrates of similar materials depends mainly on the materials involved, on
the orientation of the deposited tracks in relation to the substrate and on the deposition
parameters. In the present paper these relations are discussed and illustrated for the
case of single and multiple layer depositions of NiCrAlY and Rene N4 on (100)
substrates of SRR99 and CMSX-4 Ni-based superalloys. On the other hand, when the aging
treatment is applied directly to the solidification
resulting from laser
deposition, abnormal γ/γ′
may result, due to the inhomogeneity created by alloying elements partition during
Performing a homogenization annealing before aging circumvents this difficulty. The
homogenizing annealing also eliminates undesirable brittle phases present in the
such as carbides and topologically close-packed compounds.
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