摘要
利用激光表面合金化技术在AISI321不锈钢表面制备了TiC增强复合涂层。X射线衍射结果表明,复合涂层主要由TiC、Cr6C23和奥氏体相组成;金相观测显示复合涂层组织细小、均匀,无裂纹和气孔,与基体形成良好的冶金结合;激光表面合金化复合涂层显微硬度达400HV,约为基体的2倍,且呈阶梯分布;在室温油润滑磨损试验条件下,复合涂层磨损量和摩擦系数均小于基体;利用扫描电子显微镜观测到复合涂层磨损表面划痕较浅且平滑,无明显的犁沟、粘着、剥落现象,表现出了优异的耐磨性。
TiC reinforced composite coating was prepared on AISI321 stainless steel by laser surface alloying.The result of X-ray diffraction test shows the composite coating mainly consists of TiC,Cr（23）C6 and austenitic phase.The metallographic analysis indicates the composite coating is metallurgically bonded to the stainless steel matrix,the microstructure of the composite coatings is fine and uniform,without porous or microcracks.Microhardness of the composite coating is up to 400 HV,which is twice of the matrix and the microhardness exhibits a stepping distribution. At room temperature and under oil lubricating condition, the resuhs of sliding wear tests indicate the mass loss and friction coefficient of the composite coating are smaller than those of the matrix. The worn surface of the composite coating observed by scanning electron microscopy is much smoother than that of the matrix, without grooves or crater. The wear-resistance of AISI321 stainless steel is greatly improved by laser surface alloying.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2009年第4期160-163,共4页
Transactions of Materials and Heat Treatment
关键词
激光表面合金化
TIC
微观组织
显微硬度
耐磨性
laser surface alloying
TiC carbide
microstructure
microhardness
wear resistance
