Microstructure of nanometer Al2O3 dispersion strengthened Ni-based high-temperature protective coatings by laser cladding
作者： Hong-yu WANG , Dun-wen ZUO , Yu-li SUN , Feng XU , Dan ZHANG
DOI: 10.1016/S1003-6326(08)60317-9
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摘要: Abstract The nanometer Al 2 O 3 dispersion strengthened NiCoCrAlY high-temperature protective coatings by crosscurrent CO laser on Ni-based superalloy GH4033 were produced. Microscopic morphologies, phase constitutions of cladding and distribution nano-Al particles examined using SEM XRD. results show that the interface grains, after adding proper , grow from epitaxial to non-epitaxial shape gradually, columnar dendrites become thinner denser with cellular shape. Cracks in substrate close are eliminated. Moreover, dispersive mainly distribute around substructure grain-boundaries, which prevents diffusion alloying elements restrains formation new phase. There is a critical value addition, most suitable content 1% (mass fraction) this experimental conditions. “nanometer effect” plays an important role improvement coating microstructure.
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