Growth Characteristics and Reinforcing Behavior of In-situ NbCp in Laser Cladded Fe-based Composite Coating

doi:10.1016/j.jmst.2014.06.012

Abstract

Abstract: Over the past decade, researchers demonstrated much interest in laser cladded metal matrix composite coatings for its good wear resistance. In this paper, in-situ NbCp reinforced Fe-based wear-resistance coatings with different designed NbC contents were produced by laser cladding. The formation mechanism of NbC particle was analyzed. The effects of NbC content on the microstructure and mechanical properties of coatings were investigated. It was revealed that α-(Fe, Cr), (Fe, Cr)₇C₃, NbC existed in all coatings. NbC particles formed by the chemical reaction of Nb and C dissolved in the molten pool. The increase of designed NbC content led to the growth of the porosity amount, and the increase of the size and the area ratio of the particle, as well as the transformation of the NbCp morphology from quadrangle to petaloid shape. Moreover, the micro-hardness and the wear resistance of the coating were improved with the increase of NbC. When NbCp content was 30 wt%, the mechanical properties decreased slightly.

Key words: Laser cladding, In-situ, NbC particle, Formation mechanism, Mechanical property

Qingtang Li, Yongping Lei, Hanguang Fu. Growth Characteristics and Reinforcing Behavior of In-situ NbCp in Laser Cladded Fe-based Composite Coating[J]. J. Mater. Sci. Technol., 2015, 31(7): 766-772.

Figures/Tables 11

Structural diagram of the wear tester.

Macrostructure of the laser coatings with different designed NbC contents: (a) 5 wt% NbC

(b) 30 wt% NbC (porosities are marked by white arrows).

XRD patterns of the coatings with different designed NbC contents.

Typical morphology of the microstructure of laser coating: (a) SEM micrograph of phases in the coating

(b) bright-field TEM micrograph of the NbC particle

EDS results of the NbC particles: (a) atomic ratio of Nb and C in the particle

(b) line scanning result of Nb and C in the particle.

Morphology of the NbC particle with different designed NbC contents: (a) 5 wt% NbC

(b) 20 wt% NbC

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