Distribution Characteristics and Reinforcing Behavior of(Ti,Nb)C Reinforced Particle in the Coating Fabricated by Laser Rapid Cladding  

作　　者：Qing tang LI Yong ping LEI Han-guang FU Zhong-wei WU Jian LIN 

机构地区：[1]School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China

出　　处：《Journal of Iron and Steel Research International》2016年第2期124-129,共6页

基　　金：Item Sponsored by National Natural Science Foundation of China(51275006,51274016);Natural Science Foundation of Beijing of China(2142009);Scientific Plan Item of Beijing Education Committee of China(PXM2015-014204-500170)

摘　　要：（Ti, Nb）C reinforced Fe based laser coatings were prepared with normal and high scanning velocities of the laser beam. The distribution characteristics of reinforced particles in the coatings were investigated. The mechanical properties of coatings were tested. The results showed that the morphologies of the microstructure and the reinforced particle changed dramatically at high solidification rate due to rapid laser processing compared with that prepared by normal processing. Two kinds of particles were observed in the coating. One was （Ti, Nb）C multiple carbide particle with the size of micron and sub micron scales, in which a mass of dislocations were found. Another was nano sized particle including a Fe and （Ti, Nb）C obtained by rapid solidification. The microstructure of the coatings was highly refined and a large number of twin crystals were found in matrix. The resuhs of mechanical properties test revealed that the wear resistance of the coaling was improved by rapid laser processing, compared with that of the coating prepared with normal speeds. The ahove-mentioned conclusion indicated that rapid laser cladding can promote not on ly the processing efficiency but also lhe mechanical properties of the coating.（Ti, Nb）C reinforced Fe based laser coatings were prepared with normal and high scanning velocities of the laser beam. The distribution characteristics of reinforced particles in the coatings were investigated. The mechanical properties of coatings were tested. The results showed that the morphologies of the microstructure and the reinforced particle changed dramatically at high solidification rate due to rapid laser processing compared with that prepared by normal processing. Two kinds of particles were observed in the coating. One was （Ti, Nb）C multiple carbide particle with the size of micron and sub micron scales, in which a mass of dislocations were found. Another was nano sized particle including a Fe and （Ti, Nb）C obtained by rapid solidification. The microstructure of the coatings was highly refined and a large number of twin crystals were found in matrix. The resuhs of mechanical properties test revealed that the wear resistance of the coaling was improved by rapid laser processing, compared with that of the coating prepared with normal speeds. The ahove-mentioned conclusion indicated that rapid laser cladding can promote not on ly the processing efficiency but also lhe mechanical properties of the coating.

关 键 词：laser rapid cladding wear resistant coating （Ti Nb）C particle formation mechanism mechanical property 

分 类 号：TG174.4[金属学及工艺—金属表面处理]