激光熔覆Fe基TiB_2+TiC金属陶瓷层的组织及摩擦磨损性能  

Microstructure as well as Friction and Wear Behavior of Laser Cladding Fe /TiB_2-TiC Iron-Based Cermet Coating

作　　者：汪新衡[1] 刘安民[1] 钱书琨 朱航生 

机构地区：[1]湖南工学院先进制造技术研究所,湖南衡阳421002 [2]湖南科技经贸职业学院,湖南衡阳421001 [3]衡阳丰顺车桥有限公司产品部,湖南衡阳421001

出　　处：《材料保护》2014年第1期52-54,10,共3页Materials Protection

基　　金：湖南省自然科学省市联合基金项目(13JJ9025);湖南工学院重点科研项目(HGZ0601)资助

摘　　要：目前,对激光熔覆原位自生金属陶瓷层增强相的形成机制及磨损机理的研究尚不系统。自配合金粉末,采用激光熔覆技术在Q235钢表面制备了原位自生的TiB2+TiC/Fe金属陶瓷层。对熔覆层进行了XRD分析、显微组织观察及室温干滑动摩擦磨损试验。结果表明:Fe基TiB2+TiC金属陶瓷增强熔覆层组织细小、致密,高硬度的亚微米TiB2和TiC金属陶瓷颗粒均匀弥散分布在α-Fe等轴枝晶基体上,熔覆层与基体冶金结合优良;室温下熔覆层的磨损主要为显微切削和滑擦,耐摩擦磨损性能优良。Few systematical studies are currently available about the formation mechanism and wear mechanism of cermet coating reinforcing phases prepared by in-situ laser cladding. Thus alloy powders of TiB2-TiC were formulated at our laboratory and made into iron based cermet coating Fe / TiB2-TiC on the surface of Q235 steel by laser cladding. The phase composition and microstructure of as-prepared Fe / TiB2-TiC cermet coating were analyzed with an X-ray diffractometer and a scanning electron microscope,and its friction and wear behavior under dry sliding condition was also evaluated. Results indicated that the laser cladding la-yer of Fe / TiB2-TiC cermet coating was fine and compact.Sub-micron TiB2and TiC ceramic particles with high hardness were uniformly distributed in α-Fe equiaxed dendrite matrix,and strong metallurgical bonding was formed between the cladding layer and Fe-matrix. In the meantime,laser cladding Fe / TiB2-TiC cermet coating exhibited desired friction and wear behavior under room temperature,and its main wear mechanisms were micro cutting and scuffing.

关 键 词：激光熔覆 Fe基TiB2+TiC金属陶瓷涂层 原位自生 摩擦磨损性能 Q235钢 

分 类 号：TG174.4[金属学及工艺—金属表面处理]