A Comparative Study of the Microstructure, Mechanical Properties and Corrosion Resistance of Ni- or Fe- Based Composite Coatings by Laser Cladding

Journal Article · Fri Jun 15 04:00:00 EDT 2018 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3282-1· OSTI ID:22860469

Wan, M. Q.; Lei, L.; Cui, Z. Y.; Wang, H. L.

Ni- and Fe-based composite coatings were laser cladded on 40Cr steel to improve the surface mechanical property and corrosion resistance, respectively. The microstructure and phase composition were analyzed by x-ray diffraction (XRD) and field emission scanning electron microscope (FESEM) equipped with an energy-dispersive spectrometer (EDS). The micro-hardness, tribological properties and electrochemical corrosion behavior of the coatings were evaluated. The results show that the thickness of both the coatings is around 0.7 mm, the Ni-based coating is mainly composed of γ-(Ni, Fe), FeNi{sub 3}, Ni{sub 31}Si{sub 12}, Ni{sub 3}B, CrB and Cr{sub 7}C{sub 3}, and the Fe-based coating is mainly composed of austenite and (Fe, Cr){sub 7}C{sub 3}. Micro-hardness of the Ni-based composite coating is about 960 HV{sub 0.3}, much higher than that of Fe-based coating (357.4 HV{sub 0.3}) and the 40Cr substrate (251 HV{sub 0.3}). Meanwhile, the Ni-based composite coating possesses better wear resistance than the Fe-based coating validated by the worn appearance and the wear loss. Electrochemical results suggested that Ni-based coating exhibited better corrosion resistance than the Fe-based coating. The 40Cr substrate could be well protected by the Ni-based coating.

• OSTI ID: 22860469
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 6 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
CHROMIUM BORIDES
CHROMIUM CARBIDES
CLADDING
COATINGS
CORROSION RESISTANCE
ELECTROCHEMICAL CORROSION
ELECTROCHEMISTRY
FIELD EMISSION
HARDNESS
IRON
LASER RADIATION
MICROSTRUCTURE
NICKEL
SCANNING ELECTRON MICROSCOPY
SPECTROMETERS
STEELS
WEAR RESISTANCE
X-RAY DIFFRACTION