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

• Published in: Journal of materials science & technology Vol. 31; no. 7; pp. 766 - 772
• Main Authors: Li, Qingtang, Lei, Yongping, Fu, Hanguang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2015
• Subjects: Chromium; Coatings; Formation mechanism; In-situ; Laser cladding; Lasers; Mechanical properties; Mechanical property; Metal matrix composites; NbC particle; Particulate composites; Protective coatings; Wear resistance; 原位增强; 复合涂层; 激光熔覆; 生长特性; 耐磨涂料; 行为; 颗粒面积比; NbC particle; In-situ; Laser cladding; Formation mechanism; Mechanical property
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/j.jmst.2014.06.012

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 mech- anism 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. Copyright @ 2015, The editorial office of Journal of Materials Science ＆ Technology. Published by Elsevier