Epitaxial deposition of MCrAlY coatings on a Ni-base superalloy by laser cladding

Bezençon, Cyrille; Schnell, Alexander; Kurz, W.

doi:10.1016/s1359-6462(03)00369-5

Cited by 114 publications

(48 citation statements)

References 4 publications

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“…The process was designated epitaxial laser metal forming by Kurz and co-workers. [15][16][17] Bezençon et al 18,19 and Vilar et al 20,21 showed later that a similar result can be obtained for dissimilar materials systems, provided that epitaxy exists at the interface between the coating and the substrate.…”

Section: Introductionmentioning

confidence: 86%

Repair and manufacturing of single crystal Ni-based superalloys components by laser powder deposition—A review

Vilar

Almeida

2014

Journal of Laser Applications

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Laser powder 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) single crystal substrates of SRR99 and CMSX-4 Ni-based superalloys. On the other hand, when the aging treatment is applied directly to the solidification microstructure resulting from laser deposition, abnormal γ/γ′ microstructures may result, due to the inhomogeneity created by alloying elements partition during solidification. Performing a homogenization annealing before aging circumvents this difficulty. The homogenizing annealing also eliminates undesirable brittle phases present in the solidification microstructure, such as carbides and topologically close-packed compounds.

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Section: Introductionmentioning

confidence: 86%

Repair and manufacturing of single crystal Ni-based superalloys components by laser powder deposition—A review

Vilar

Almeida

2014

Journal of Laser Applications

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“…6. According to the theory of Bezencon et al (2003), the crystallographic structure and dendrite orientation of the pre-deposited layer were reproduced. Thus the directionally solidified columnar crystal was obtained by the epitaixal growth, which has been found to possess high thermal stability, high-temperature strength, and high thermal fatigue resistance because of the removal of transverse grain boundaries which are perpendicular to stress direction.…”

Section: Microstructure In the Coatingmentioning

confidence: 99%

Microstructural evolution and bonding characteristic in multi-layer laser cladding of NiCoCr alloy on compacted graphite cast iron

Liu

Hao

Han

et al. 2016

Journal of Materials Processing Technology

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“…Also, the laser treated material will have the same crystallographic orientation as the substrate if growth remains columnar during the whole solidification process and thus the so-called columnar to equiaxed transition (CET) is avoided. However, when the filler alloy has a different composition to the substrate, epitaxial and crack free growth may be impossible due to nucleation and growth of different phases [7]. For the repair of worn SX turbine blade tips, the usage of a high-temperature oxidation resistant γ/β-MCrAlY coating material is desired.…”

Section: Laser Melting Forming (Lmf) -Applied To the Repair Sx Blade mentioning

confidence: 99%

A Study of the Weldability of Gamma Prime Hardened Superalloys

Schnell

Hoebel

Samuleson

2011

AMR

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Fusion repair processes such as gas tungsten arc welding (GTAW) and laser welding have been introduced for repairing turbine parts made from Ni-based superalloy materials. The weld-repair of turbine parts is well established, however, the inherent susceptibility of γ' hardened superalloys to weld cracking remains an issue and has resulted in repair limitations for highly loaded areas of turbine parts. This study presents a view of the weldability of superalloys taking both, the impact of the weld process and the weld filler selection into consideration. This comprises the interpretation of specific process parameters into physical parameters controlling the weldability and cracking sensitivity such as thermal gradient in the weld pool and solidification speed. Alloy specific parameters of the weld filler material, such as melting point and solidification interval are studied and set in correlation with the solidification parameters during welding.

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Epitaxial deposition of MCrAlY coatings on a Ni-base superalloy by laser cladding

Cited by 114 publications

References 4 publications

Repair and manufacturing of single crystal Ni-based superalloys components by laser powder deposition—A review

Repair and manufacturing of single crystal Ni-based superalloys components by laser powder deposition—A review

Microstructural evolution and bonding characteristic in multi-layer laser cladding of NiCoCr alloy on compacted graphite cast iron

A Study of the Weldability of Gamma Prime Hardened Superalloys

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