期刊
APPLIED SCIENCES-BASEL
卷 11, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/app11146580
关键词
laser cladding; high entropy alloys; metal matrix composites (MMC); titanium carbide; hardness
类别
资金
- Korea Institute of Industrial Technology [KITECH EH-21-0003]
TiC-reinforced metal matrix composites were fabricated by laser cladding with FeCrCoNiAlTiC high entropy alloy powder. The coating layer under the effective heat input of 50 J/mm(2) had relatively homogeneous blocky particles of several micrometers in size, with a micro-hardness value over 900 HV, and nano-hardness of the reinforcing particles and the matrix were 17 GPa and 10 GPa, respectively.
TiC-reinforced metal matrix composites were fabricated by laser cladding and FeCrCoNiAlTiC high entropy alloy powder. The heat of the laser formed a TiC phase, which was consistent with the thermodynamic calculation, and produced a coating layer without interfacial defects. TiC reinforcing particles exhibited various morphologies, such as spherical, blocky, and dendritic particles, depending on the heat input and coating depth. A dendritic morphology is observed in the lower part of the coating layer near the AISI 304 substrate, where heat is rapidly transferred. Low heat input leads to an inhomogeneous microstructure and coating depth due to the poor fluidity of molten pool. On the other hand, high heat input dissolved reinforcing particles by dilution with the substrate. The coating layer under the effective heat input of 50 J/mm(2) had relatively homogeneous blocky particles of several micrometers in size. The micro-hardness value of the coating layer is over 900 HV, and the nano-hardness of the reinforcing particles and the matrix were 17 GPa and 10 GPa, respectively.
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