Effect of Laser Energy Density on Microstructure and Properties of Laser Cladding NiCoCrAlY Coating

doi:10.3969/j.issn.1000-1093.2021.05.021

Abstract

Abstract: NiCoCrAlY coating was prepared on the surface of 304 stainless steel in order to study the effect of energy density on the microstructure and properties of NiCoCrAlY coating during laser cladding. The phase composition and microstructure of NiCoCrAlY coating were analyzed by X-ray diffractometer (XRD) and scanning electron microscope (SEM). The hardness and wear resistance of NiCoCrAlY coating were studied by using a micro Vickers hardness tester and reciprocating friction and wear testing machine. The results show that the number of pores in NiCoCrAlY coating decreases with the increase in laser energy density, and the penetration and melting height increase with the increase in laser energy density. When the laser energy density is 3.8 kJ/cm², the coating dilution rate is the lowest, and the number of pores is less. The NiCoCrAlY coating contains γ/γ′ phase and β phase, and its microstructure is mainly columnar crystals. As the laser energy density increases, β phase content increases and the columnar crystals become larger. The hardness of NiCoCrAlY coating is higher than that of the substrate at different laser energy densities. The coating hardness is the highest when the laser energy density is 3.8 kJ/cm², which is 301 HV_0.2. In the reciprocating friction and wear experiment, when the laser energy density is 3.8 kJ/cm², the friction coefficient is the smallest (0.46) and wear volume is the smallest (0.235 9 mm³), the wear mechanism is mainly abrasive wear, and the wear resistance is the best.

Key words: lasercladding, NiCoCrAlYcoating, hardness, wearresistance

CLC Number:

TG174.44

NIE Jinhao， YANG Yixin， LI Yuxin， ZHANG Hongjian， WEI Shouzheng， CAI Jie， GUAN Qingfeng. Effect of Laser Energy Density on Microstructure and Properties of Laser Cladding NiCoCrAlY Coating[J]. Acta Armamentarii, 2021, 42(5): 1083-1091.

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