钴含量对煤矿液压支架立柱外圆激光熔覆层的硬度均匀性及耐蚀性的影响  

The Influence of Cobalt Content on the Hardness Uniformity and Corrosion Resistance of the Laser Cladding Layer on the Outer Circle of Coal Mine Hydraulic Support Columns

作　　者：周建峰 ZHOU Jianfeng(Guoneng Shendong Coal Mining Co.,Ltd.,Equipment Management Center,Yulin 719315,China)

机构地区：[1]国能神东煤炭有限公司设备管理中心,陕西榆林719315

出　　处：《煤矿机电》2024年第6期51-58,共8页Colliery Mechanical & Electrical Technology

摘　　要：设计了4种用于煤矿液压支架立柱外圆激光熔覆的铁基合金粉末,研究了钴元素对激光熔覆层的硬度均匀性及耐蚀性的影响。随着钴含量的不断增加,熔覆层的最高硬度与最低硬度之间的差值由133.2 HV逐步下降至16.6 HV,熔覆层的平均硬度也呈现线性下降。通过分析可知,熔覆层中的基体相由马氏体和铁素体构成。低钴含量的熔覆层中铁素体相占比较高、马氏体相占比较低,且马氏体相中的碳元素含量多于高钴含量的熔覆层,这是硬度波动的本质原因。随着钴含量的增加,熔覆层的耐蚀性得以提高。这主要得益于钴的加入促进了高温奥氏体相的增多,降低了熔覆层中马氏体相的碳浓度,使熔覆层的硬度均匀性和耐蚀性同时得以改善。Four types of iron-based alloy powders were designed for laser cladding of the outer circle of coal mine hydraulic support columns.The influence of cobalt element on the hardness uniformity and corrosion resistance of laser cladding layer was studied.With the continuous increase of cobalt content,the difference between the highest and lowest hardness of the cladding layer gradually decreases from 133.2 HV to 16.6 HV,and the average hardness of the cladding layer also shows a linear decrease.Through analysis,it can be concluded that the matrix phase in the cladding layer was composed of martensite and ferrite.The low cobalt content cladding layer has a higher proportion of ferrite phase and a lower proportion of martensite phase,and the carbon element content in the martensite phase is higher than that in the high cobalt content cladding layer,which is the essential reason for the hardness fluctuation.With the increase of cobalt content,the corrosion resistance of the cladding layer was improved.This is mainly due to the addition of cobalt promoting the increase of high-temperature austenite phase,reducing the carbon concentration of martensite phase in the cladding layer,and improving the hardness uniformity and corrosion resistance of the cladding layer at the same time.

关 键 词：液压支架立柱 激光熔覆 基体相 马氏体 铁素体 

分 类 号：TD355.4[矿业工程—矿井建设] TG178[金属学及工艺—金属表面处理] TG665[金属学及工艺—金属学]