硼对激光熔覆Fe-Ti-V-C合金系组织和性能的影响  

Effect of Boron Element on the Microstructure and Property of Laser Cladding Fe-Ti-V-C Alloy System

作　　者：王晓荣[1] 王新洪[1] 侍国文 徐晓脍[1] 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,山东济南250061 [2]盐城市盐南中等专业学校信息工程部,江苏盐城224041

出　　处：《中国激光》2010年第7期1903-1907,共5页Chinese Journal of Lasers

基　　金：山东省科技攻关计划项目(06GG3203009)资助课题

摘　　要：采用激光熔覆技术在Q235钢表面制备了Fe-Ti-V-B-C合金系的陶瓷相颗粒增强涂层,利用X射线衍射(XRD)、光学显微镜(OM)、扫描电镜(SEM)、显微硬度计及磨损试验机等测试与分析方法,研究了不同硼铁加入量对熔覆层组织与性能的影响。结果表明,熔覆层成形好,表面无夹渣,且与母材呈良好冶金结合。硼的加入,细化了涂层中均匀分布的陶瓷相颗粒,同时使基体组织由针状铁素体组织转变为珠光体和高碳马氏体组织。随着硼铁加入量的增加,涂层显微硬度随之提高,当硼铁加入质量分数达到25%时,涂层出现纵向裂纹。通过耐磨损性能测试,硼铁加入质量分数为20%涂层的磨损量仅约为母材的1/10。In this study,Fe-Ti-V-B-C alloy coatings reinforced by ceramic particles are produced by laser cladding on the Q235 steel,the influence of ferroboron on the microstructure and property of the coatings is investigated by means of X-ray diffraction（XRD）,optical microscope（OM）,scanning electron microscope（SEM）,micro-hardness tester and wear tester.Results show that the coatings are free from slag inclusion,exhibit high formability and good metallurgical bond with the substrate.The boron addition not only refines ceramic particles,but also changes the microstructure of the matrix of coatings from acicular ferrite to pearlite or high carbon martensite.The micro-hardness of the coatings increases while ferroboron content increases,however,when the ferroboron content is beyond mass fraction of 25%,the crack extending along longitudinal direction of the coating is found.Through the test of wear resistance,the weight loss of the coating,which contents mass fraction of 20% ferroboron,is just one tenth of that of the substrate.

关 键 词：激光技术 激光熔覆 Fe-Ti-V-B-C合金 硼 显微硬度 耐磨损性能 

分 类 号：TN249[电子电信—物理电子学] TG176[金属学及工艺—金属表面处理]