4.7 Article

Microstructures and corrosion resistance of Fe-based amorphous/nanocrystalline coating fabricated by laser cladding

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 728, Issue -, Pages 1116-1123

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.08.251

Keywords

Fe-based amorphous/nanocrystalline coating; Laser cladding; Microstructure; Corrosion resistance

Funding

  1. National Natural Science Foundation of China [51461031]
  2. Department of Education Fund of Jiangxi Province [GJJ150733]
  3. Natural Science Foundation of Jiangxi Province [20161BBH80031]
  4. Power Construction Corporation of China [DJ-ZDXM-2014-34]

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Fe-based amorphous/nanocrystalline coatings were fabricated with industrial FeCoCrMoCBY alloy plate on the mild steel surface by laser cladding. The formation, microstructure were investigated with optical microscope (OM), transmission electron microscope (TEM) and X-ray diffraction (XRD). The results indicate that few pore and just only some cracks are formed in all of the coatings. With increase of heat input, some crystal phases of a-Fe, Fe3C and Fe23C6 are precipitated gradually in the coating layers, and the microhardness of the coating layers decreases gradually, while the maximum microhardness is up to 1300 Hv near to 5 times high than that of substrate. Though the passive currents of coating layers increase with increase of heat input, all of coating layers exhibit low corrosion current density, passive current density and wide passive region, which means all of coating layers present excellent corrosion resistance, even more superiors than that of 316L stainless steel in NaCl solution. (C) 2017 Elsevier B.V. All rights reserved.

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