45钢表面电火花沉积TiB_2涂层的结构及性能  

Microstructure and Properties of TiB_2 Coating Deposited on Surface of 45 Steel by Electrospark

作　　者：罗成[1,2] 董仕节[1] 熊翔[2] 罗平[1] 

机构地区：[1]湖北汽车工业学院材料工程系,十堰442002 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《机械工程材料》2009年第11期54-57,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(50575069);教育部留学回国人员科研启动基金资助项目(教外司留[2004]527号);湖北省教育厅创新团队资助项目(2003T015)

摘　　要：在45钢表面通过电火花沉积制备了TiB2陶瓷涂层,通过光学显微镜和扫描电镜及其附带的能谱仪分析了涂层微观形貌及元素分布,并测试了涂层横截面的硬度分布及涂层的耐磨性。结果表明:45钢表面电火花沉积的TiB2涂层具有明显的四个区域,涂层连续、均匀且致密,界面上无分层,热影响区内铁素体晶粒被大大细化;基体中的铁元素显著扩散到涂层中,涂层与基体形成了牢固的冶金结合;涂层的硬度高达1 600 HV以上,其耐磨性优于淬火态Cr12MoV钢的耐磨性。Ceramic coating TiB2 was deposited on the surface of 45 steel by electrospark. Micromorphology and element distribution of the coating were observed using optical microscope, scanning electronic microscope and EDS. Microhardness distribution and wear resistance of the coating were determined. The results indicate that the TiB deposited 45 steel demonstrated a typical four zone structure. The TiB2 coating was continuous, uniform, dense and lamination free. The grain size of the ferrite in HAg, was reduced greatly. Element Fe in the substrate diffused to the coating obviously, resulting in an atomic bonding between the coating and the substrate. The hardness of the coating was approximately 1 600 HV. The wear resistance of the TiB2-coated 45 steel exceeded that of quenched Cr12MoV steel.

关 键 词：电火花沉积 表面强化 二硼化钛 耐磨性 

分 类 号：TG162.4[金属学及工艺—热处理]