Microstructure and Properties of CoCrFeNiTi-Ti2AlC@Ni high-Entropy Alloy Composite Coatings by Ultra-high Speed Laser Cladding

Yunpeng Zhao

doi:10.6919/ICJE.202501_11(1).0002

Microstructure and Properties of CoCrFeNiTi-Ti2AlC@Ni high-Entropy Alloy Composite Coatings by Ultra-high Speed Laser Cladding

Yunpeng Zhao

International Core Journal of Engineering, (2024), Vol.11, No.1, pp.11-22

Published: December 19, 2024

DOI: 10.6919/ICJE.202501_11(1).0002

PDF: Download Full Text PDF

Abstract

In this paper, the CoCrFeNiTi- Ti2AlC@Ni high entropy alloy self-lubricating composite coating was prepared on the surface of Cr12MoV die steel by using the ultra-high speed laser cladding technology. Its phase composition, microstructure, element distribution, nano-hardness, wear resistance and anti-deformation ability were studied. The research results show that after adding Ti2AlC into the coating, there are relatively significant changes in both its microstructure and mechanical properties. From the perspective of microstructure, under the action of Ti2AlC, the grains are distributed more densely and uniformly, demonstrating good microstructure characteristics. In terms of mechanical properties, under the effect of grain refinement strengthening and the pinning effect of the newly generated phases, the indentation depth of the coating decreases from 1212 nm to 989 nm, and the elastic modulus increases from 204.06 Gpa to 228 Gpa, showing good resistance to plastic deformation. The nano-hardness of the coating increases from 8.65 Gpa to 12.57 Gpa. Moreover, Ti2AlC plays a pivotal role in reducing friction during the friction process. Therefore, under the synergistic effect of high hardness and self-lubrication, the wear resistance of the coating is improved, and the wear resistance of the coating reaches the best when it is 3%. At this time, the wear scar is the narrowest and the shallowest, the coating wear is the most uniform, and the friction coefficient decreases from 0.528 to 0.481.

Keywords: Ultra-high Speed Laser Cladding; Self-lubricating Composite Coating; Cr12MoV Die Steel; Mechanical Properties; High Entropy Alloy.

APA Citation: Yunpeng Zhao (2024). Microstructure and Properties of CoCrFeNiTi-Ti2AlC@Ni high-Entropy Alloy Composite Coatings by Ultra-high Speed Laser Cladding. International Core Journal of Engineering, 11(1), 11-22. https://doi.org/10.6919/ICJE.202501_11(1).0002

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