半导体激光熔覆Co/B_4C复合材料的研究  

Co/B_4C Composite Coatings on Medium Carbon Steel Produced by Diode Laser Cladding

作　　者：熊大辉 闵大勇 蔡菲菲 王喜 叶兵 卢飞星 王爱华[1,2] 

机构地区：[1]激光先进制造技术湖北省重点实验室,华工科技产业股份有限公司,湖北武汉430223 [2]华中科技大学材料科学与工程学院,湖北武汉430074

出　　处：《应用激光》2014年第2期91-94,共4页Applied Laser

基　　金：国家科技支撑计划资助项目(项目编号:2012BAF08B02)

摘　　要：采用3kW半导体激光在45#基体上激光熔覆Co/B4C复合材料,并研究了B4C含量对熔覆层裂纹、组织和硬度的影响规律,获得了最佳的B4C含量。结果表明,B4C含量从w(B4C)=1.0%增加到w(B4C)=2.0%时,熔覆层无裂纹和气孔等缺陷,B4C达w(B4C)=3.0%时,熔覆层出现裂纹;熔覆层与基体呈冶金结合,呈致密均匀的枝晶组织,枝晶组织随B4C含量增加逐渐细化;随着B4C含量的增加,熔覆层的显微硬度由无B4C的HV0.2 400提高到约HV0.2 900,强化效果显著。A 3 kW diode laser was adopted to produce Co/B4 C composite coatings on medium carbon steel. Influences of Ccontent on cracking, microstructure and microhardness of the laser-clad coatings were investigated to optimize the B4 C content.Results show that the laser-clad coatings with B4C content from 1.0wt. 0% to 2.0wt5 were free of cracks and pores, but thecoating containing 3.0wt. 154 C presented cracks; Laser-clad coatings were metallurgically-bonded to the substrate, displayedfine dendrite and became finer with an increase in 134 C content. Significant strengthening effect （mierohardness from HV0.2 400 to HV0.2 900） was achieved by the introduction of B4C particulate.

关 键 词：半导体激光熔覆 CO B4C复合材料 组织 显微硬度 

分 类 号：TN249[电子电信—物理电子学]