Effect of Laser Process Parameters on Microstructures and Properties of NiCoCrAlYSi Laser Cladding Coating

doi:10.3969/j.issn.1000-1093.2021.07.020

Abstract

Abstract: NiCoCrAlYSi coating was fabricated on Ni625 superalloy by laser cladding technique, and the influences of laser power and scanning speed on the metallurgical quality and microstructure of NiCoCrAlYSi cladding coating were researched. The relationship among the laser cladding process parameters, and the microstructures and properties of cladding coating was analyzed by testing its micro-hardness, and friction and wear properties. The results show that, with the increase in laser input energy from 36 J/mm² to 73.3 J/mm², the thickness of cladding layer increases from 534 μm to 1 535 μm, the surface porosity increases from 0.07% to 0.65%, and the pore size increases from 0.23 μm to 1.33 μm. In addition, the grain size of cladding layer increases. The microhardness and wear resistance of the cladding layer decrease gradually with the increase in porosity and grain size. When the laser input energy ratio is 36 J/mm², a cladding coating with high compactness, supper refined grains and high density of dislocations is obtained, which has optimal microhardness and wear resistance.

Key words: Ni625superalloy, lasercladding, scanningspeed, laserpower, microstructure, microhardness, frictionandwearproperty

CLC Number:

TG174.442⁺.9

SHEN Hao, CAI Jie, L Peng, ZHANG Conglin, LI Yuxin, GUAN Qingfeng. Effect of Laser Process Parameters on Microstructures and Properties of NiCoCrAlYSi Laser Cladding Coating[J]. Acta Armamentarii, 2021, 42(7): 1524-1534.

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