In-situ TiC/FeAl Composite Coating Fabricated by Laser Cladding

doi:10.11901/1005.3093.2017.148

Chinese Journal of Materials Research

2017, Vol. 31

Issue (11): 860-866 DOI: 10.11901/1005.3093.2017.148

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In-situ TiC/FeAl Composite Coating Fabricated by Laser Cladding

Longzhi ZHAO¹(

), Haichao YANG¹, Mingjuan ZHAO¹, Yujiang XIE²

1 Materials Science and Engineering College, East China Jiaotong University, Nanchang 330013, China.
2 State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China.

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Longzhi ZHAO, Haichao YANG, Mingjuan ZHAO, Yujiang XIE. In-situ TiC/FeAl Composite Coating Fabricated by Laser Cladding. Chinese Journal of Materials Research, 2017, 31(11): 860-866.

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Abstract

The in-situ TiC/FeAl composite coating was fabricated by laser cladding technology in this paper. The microstructure of the coating was characterized by metallographic microscope (OM), scanning electron microscopy(SEM).The phases in the coating were examined by energy dispersive spectrometry (EDS) and X-ray diffraction (XRD), microhardness and wear resistance of the coating were also investigated. The results show that from the bottom to the surface of the melt pool along the depth the coarse dendrite grain is changed into fine quiaxed rosette grain. Some TiC particles going across the interface exist in the surface layer of the substrate. Most of TiC particles existing in the grains are nucleation centers during FeAl matrix solidification. The content of TiC particles in the top of the coating is much higher than that in other zone of the coating. Meanwhile, the microhardness and wear resistance of in-situ laser cladding are 5 times and 52 higher than those of substrate, respectively. And the wear mechanism of the composite coating is abrasive wear.

Key words: surface and interface in the materials laser cladding in-situ TiC/FeAl composite coating microstructure microhardness wear resistance

Received: 22 February 2017

Fund: Supported by National Natural Science Foundation of China (Nos. 51265014 &51465019), Scientific Research Projects of Jiangxi Provincial Science and Technology Department (Nos. 20142BDH80004, 20153BCB23005 & 20151BAB206044), Scientific Research Projects of Jiangxi Provincial Education Department (Nos. KJLD14040 & GJJ150487)

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	Longzhi ZHAO
	Haichao YANG
	Mingjuan ZHAO
	Yujiang XIE

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.148 OR https://www.cjmr.org/EN/Y2017/V31/I11/860

Table 1 Chemical compositionof A283GRCsteel (mass fraction, %)

Fig.1 Macro-morphology of composite laser cladding

Fig.2 Macro-morphology of transverse section of composite laser cladding

Fig.3 Microstructure of the composite laser cladding (a) interfacial fusion zone (b) bottom of molten pool (c) central part of molten pool (d) top of molten pool

Fig.4 Dependence of Gibbs free energy compounds of Fe-Al-Ti-C on temperature

Fig.5 EDS of the TiC/FeAl composite coating (a) point A (b) point B (c) point C

Fig.6 XRD spectrum of the cladding layer

Fig.7 Microhardness distribution of coating along crosssection

Fig.8 Wear rate of substrate and cladding layer

Fig.9 Morphology of Worn surface for cladding layer (a) substrate (b) cladding layer

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