Effects of Laser Cladding Process Parameters on Microstructure and Properties of MoFeCrTiWAlNb High - Melting - Point and High - Entropy Alloy Coating

• Published in: Cai liao bao hu Vol. 54; no. 4; pp. 94 - 101
• Main Author: WANG Zhen, SHANG Xiao - juan, TIAN Xing - qiang, LIU Qi - bin
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Materials Protection 01.04.2021
• Subjects: laser cladding; mofecrtiwalnb high - entropy alloy; microstructure; microhardness; laser power; scanning speed
• ISSN: 1001-1560
• DOI: 10.16577/j.cnki.42-1215/tb.2021.04.018

In order to improve the repetitive service life of tool steel，the MoFeCrTiWAlNb high - melting - point and high - entropy alloy(HEA) coating was successfully fabricated on the surface of high - speed steel by laser cladding. Metallographic microscope (OM), X - ray diffractometer (XRD), scanning electron microscope (SEM/EDS), and microhardness tester were used to investigate the effects of laser power and laser scanning speed on microstructure and hardness of the high - entropy alloy coatings. Results showed that the laser cladding layer was shallower and there existed a few defects such as pilling and holes on the surface of the cladding layer when the laser power was low. With the increase of the laser power, the surface morphology of the coating became smooth and uniform, the microstructure of the coating was composed of the cellular dendrites and the granular structures, and the microhardness of the coating was first increased and then decreased. As the laser scanning speed increased, the forming quality o