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Study on microstructure and compressive properties of Fe-C-W-Cr-V-Nb coating with boron addition

Journal of Alloys and Compounds, ISSN: 0925-8388, Vol: 904, Page: 163986
2022
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Article Description

A trace amount of boron was added into Fe-based coatings prepared on 42CrMo by laser cladding. The effect of additive boron level on the reinforcements and compressive properties of the coating were analyzed; the microstructure evolution and strengthening mechanism of the coating were illustrated by first-principle calculation. When the additive boron level changed in the coating, the reinforcements transformed from NbC type carbide to Cr 23 C 6 type carbide and finally to Fe 3 C type carbide, and the strength of the coatings improved significantly. When the boron content was raised to 0.75%, the coating exhibited the best compressive strength and plasticity (3510 MPa with 6.39% strain). The compression properties of the coating defined a new space in the strength-ductility map. The addition of boron was beneficial to forming a eutectic structure composed of Fe 3 C type carbides and γ-Fe by reducing the formation energy of Fe 3 C. The Fe 3 C type carbide played an important role in increasing the strength, and the γ-Fe around Fe 3 C type carbide could improve the plasticity of the coating.

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