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Comparative studies on microstructure and properties of CoCrFeMnNi high entropy alloy coatings fabricated by high-speed laser cladding and normal laser cladding.
- Source :
-
Journal of Alloys & Compounds . Jun2023, Vol. 947, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Two kinds of CoCrFeMnNi high entropy alloy (HEA) coatings were prepared by high-speed laser cladding (HS-) and normal laser cladding (N-), respectively. The phase, microstructure, micromechanical properties, and corrosion resistance of both coatings were analyzed. According to the results, both coatings are stable single-phase FCC structures with the dendrites microstructure. However, the dendrites of the HS-CoCrFeMnNi coating are finer. Owing to the low heat input and the quick cooling and heating characteristics of high-speed laser cladding, the width of the heat affected zone and the dilution ratio of the HS-CoCrFeMnNi coating are reduced. In addition, the microhardness of the HS-CoCrFeMnNi coating (∼ 184 HV 0.2) is higher than that of the N-CoCrFeMnNi coating (∼ 160 HV 0.2). The elastic modulus (E r) of the HS-CoCrFeMnNi coating is significantly increased in order to enhance its resistance to plastic deformation. The plastic storage energy Q p of the HS-CoCrFeMnNi coating is higher, revealing the improved crack resistance. The self-corrosion potential E corr of the HS-CoCrFeMnNi coating positively shifted by 0.142 V compared with the N-CoCrFeMnNi coating, and the self-corrosion current density I corr decreased from 6.3 × 10−6 A/cm2 to 2.9 × 10−7 A/cm2 in 3.5% NaCl solution. Therefore, the HS-CoCrFeMnNi coating possesses better corrosion resistance and comprehensive mechanical properties. [Display omitted] • Two CoCrFeMnNi coatings were prepared by high-speed and normal laser cladding. • High-speed laser cladding can refine grains, and decline dilution and heat effect. • Ultra non-equilibrium solidification refined grains and altered pore evolution. • Higher plastic deformation storage energy means a decrease in crack sensitivity. • HS-CoCrFeMnNi coating possesses improved microhardness and corrosion resistance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 947
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 162920383
- Full Text :
- https://doi.org/10.1016/j.jallcom.2023.169517