Microstructure and mechanical properties of in situ (Ti, Nb)Cp/Fe-based laser composite coating prepared with different heat inputs

作者：Li, Qing-Tang^*; Lei, Yong-Ping; Fu, Han-Guang; Wu, Zhong-Wei; Lin, Jian

来源：Rare Metals, 2018, 37(10): 852-858.

DOI：10.1007/s12598-015-0685-0

• Laser parameters
• (Ti
• Nb)C particle
• Distribution characteristic
• Laser coating
• Mechanical property

In this paper, in situ (Ti, Nb)C particle ((Ti, Nb)C-p) reinforced Fe-based composite coatings were produced by laser cladding on the surface of the high carbon steel. The effects of heat input on the microstructure, distribution characteristics of particle, and mechanical properties of the coating were investigated. The results show that (Ti, Nb)C multiple carbide particle is synthesized during solidification of molten pool. The size of particle coarsens gradually, the area ratio of particle increases, and the amount of particles presents a non-monotonous variation with the increase in energy density. The mechanical properties of the coating are improved dramatically compared with those of the substrate, benefiting from its higher hardness and dispersed in situ (Ti, Nb)C-p in it. With the change in heat input, the mechanical performances of the coating vary except the hardness. When energy density is 1x10(5)Jmm(-2), tensile strength and wear resistance of the coating achieve optimal value due to moderate content and size of the particle in the coating.

• 出版日期2018-10
• 单位北京工业大学