摘要
用激光熔覆法制备了TiC/FeAl原位复合涂层,使用光学显微镜(OM)和扫描电镜(SEM)观察了熔覆层的微观结构,使用能谱分析仪(EDS)和X射线衍射仪(XRD)分析了涂层的化学成分和物相,研究了熔覆层的显微硬度和耐磨性。结果表明:沿着熔池深度的方向从熔池底部到熔池顶部,FeAl基体从粗大的树枝晶渐渐转变为细小的等轴晶。原位TiC越过熔池界面进入基板表层,大部分TiC颗粒存在FeAl晶粒内部,熔池顶部的TiC颗粒含量较多。沿着熔池深度的方向从涂层顶部到基板,涂层的硬度呈阶梯形分布,熔池顶部涂层的硬度最高,涂层的硬度和耐磨性分别比基板高6倍和52倍。涂层的磨损机理为典型的磨粒磨损。
The in-situ TiC/FeAl composite coating was fabricated by laser cladding technology in this paper. The microstructure of the coating was characterized by metallographic microscope（OM）, scanning electron microscopy（SEM）.The phases in the coating were examined by energy dispersive spectrometry（EDS） and X-ray diffraction（XRD）, microhardness and wear resistance of the coating were also investigated. The results show that from the bottom to the surface of the melt pool along the depth the coarse dendrite grain is changed into fine quiaxed rosette grain. Some TiC particles going across the interface exist in the surface layer of the substrate. Most of TiC particles existing in the grains are nucleation centers during FeAl matrix solidification. The content of TiC particles in the top of the coating is much higher than that in other zone of the coating. Meanwhile, the microhardness and wear resistance of in-situ laser cladding are 5 times and 52 higher than those of substrate, respectively. And the wear mechanism of the composite coating is abrasive wear.
作者
赵龙志
杨海超
赵明娟
谢玉江
ZHAO Longzhi;YANG Haichao;ZHAO Mingjuan;XIE Yujiang(Materials Science andEngineering College, East China Jiaotong University, Nanchang 330013, China;State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences Shenyang 110016, China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2017年第11期860-866,共7页
Chinese Journal of Materials Research
基金
国家自然科学基金(51265014
51465019)
江西省科技厅科研项目(20142BDH80004
20153BCB23005和20151BAB206044)
江西省教育厅科研项目(KJLD14040和GJJ150487)~~
关键词
材料表面与界面
激光熔覆
原位TiC/FeAl复合涂层
微观结构
硬度
耐磨性
surface and interface in the materials, laser cladding, in-situ TiC/FeAI composite coating,microstructure, microhardness, wear resistance
作者简介
赵龙志，男，1977年生，博士通讯作者赵龙志，教授，zhaolongzhi@163．com，研究方向为高性能复合材料和激光成形
