Laser Cladding of Rene N4 onto CMSX-4 Single Crystal Substrates
Rene N4 coatings were produced by laser cladding onto single crystal CMSX-4 alloy substrates. The crystallographic and metallographic structures of the substrate and coatings were investigated by Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and Electron Backscattered Diffraction (EBSD). In this paper, results concerning the deposition of Rene N4 alloy on oriented CMSX-4 substrates were presented. The experiments were carried out using a Trumpf DMD505 laser powder deposition machine equipped with a 2 Kw CW CO2 laser and a coaxial nozzle. The laser beam power (P), laser beam diameter at the substrate surface (d), scanning speed (v) and powder feed rate (f) were varied in the ranges 500-800 W, 1-1.2 mm, 4-12 mm/s and 1-2 g/min, respectively. The microstructure of the deposits was also analyzed after different temperature/time ageing cycles. The present work demonstrates that single crystalline deposits of Rene N4 nickel superalloy can be produced on single crystalline substrates by laser cladding provided that the deposition direction and the processing parameters are properly chosen. Heat treatments were also effective for the dissolution of detrimental phases and for the precipitation of γ-Ni3Al strengthening phase in the clads.
Laser cladding single crystal CMSX-4 RENE N4 Turbine blade repair
SANTOS Edson C. VILAR Rui CARROLL Phil KIDA Katsuyuki
Instituto Superior Tecnico and ICEMS,Av.Rovisco Pais,1049-001,Lisbon,Portugalo Department of Mechani Instituto Superior Tecnico and ICEMS,Av.Rovisco Pais,1049-001, Lisbon,Portugalo The Welding Institute (TWI) Technology Centre (Yorkshire),S60,5TZ,Rotherham,UKo Department of Mechanical Engineering,Faculty of Engineering,Kyushu University,Japano
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
523-528
2009-10-27(万方平台首次上网日期,不代表论文的发表时间)