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

作     者：Qing-Tang Li Yong-Ping Lei Han-Guang Fu Zhong-Wei Wu Jian Lin 

作者机构：School of Materials Science and EngineeringBeijing University of Technology 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2018年第37卷第10期

页      面：852-858页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China(No.51275006) 

主　　题：Laser parameters (Ti, Nb)C particle Distribution characteristic Laser coating Mechanical property 

摘      要：In this paper, in situ （Ti, Nb）C particle （（Ti, Nb）Cp） 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）Cp in it. With the change in heat input, the mechanical performances of the coating vary except the hardness. When energy density is 1 × 10^5 ***-2, tensile strength and wear resistance of the coating achieve optimal value due to moderate content and size of the particle in the coating.