Two-Phase Matrix of Ni3Al and γ- Ni Coatings Prepared by Laser Cladding

Guang Ping Cheng; Yi Zhu He

doi:10.4028/www.scientific.net/AMM.66-68.2005

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 66-68Two-Phase Matrix of Ni3Al and γ- Ni Coatings...

Two-Phase Matrix of Ni₃Al and γ- Ni Coatings Prepared by Laser Cladding

Abstract:

As a solid solution matrix alloy, nickel-based alloys have the shortcomings that the strength will decrease with increasing temperature. The significance of this experiment is forming the two-phase matrix, in which γ- Ni solid solution are replaced partly by Ni₃Al with potential performance at high temperature. In this paper, no visible cracks and pores Ni₃Al/γ- Ni composite matrix coatings were prepared on mild steel substrate by laser cladding with mixed powders of two common thermal spying powders of Ni60AAA alloy and Ni-coated Al. The microstructure and phase constitution of the coating were studied through SEM, EDX and x-Ray diffraction analysis technique. The results show the composite coating consists of γ- Ni, Ni₃Al, Cr₂₃C₆ and CrB, both the main matrix γ- Ni solid solution and the second matrix phase of Ni₃Al being free uniformity dendrite and containing some alloying elements such as Fe, Cr, Si, etc,with the dendrites surrounded continuously by the eutectic. It may be possible for improving high-temperature performance.

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Periodical:

Applied Mechanics and Materials (Volumes 66-68)

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2005-2009

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.66-68.2005

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Online since:

July 2011

Authors:

Guang Ping Cheng, Yi Zhu He

Keywords:

Coating, Intermetallic, Laser Cladding, Ni₃Al

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