TiC_p/30CrNi4Mo复合材料的制备及其摩擦磨损性能  

Preparation and friction wear behavior of TiC_p/30CrNi4Mo composites

作　　者：付文超[1] 肖志瑜[1] 王小龙[1] 张文[1] 吴苑标[1] 

机构地区：[1]华南理工大学国家金属材料近净成形工程技术研究中心,广州510640

出　　处：《粉末冶金材料科学与工程》2015年第4期576-583,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：中央高校基本科研资助项目(2014ZP0011);广东省科技计划项目(2013B010403001)

摘　　要：采用高能球磨与热压相结合的方法制备含体积分数30%TiC增强颗粒的30CrNi4Mo复合材料,观察复合材料的显微组织、颗粒分布情况,检测复合材料的力学性能,并探讨复合材料在不同状态下的摩擦磨损行为。结果表明:50 MPa压力下,1 100℃热压烧结获得的复合材料中TiC颗粒较均匀地分布在基体中,与基体结合牢固,基体为珠光体、铁素体以及少量残余奥氏体;复合材料相对密度达97.6%,密度仅为6.83 g/cm3,抗拉强度达1 083MPa,伸长率为1.0%,硬度为53 HRC;高含量TiC颗粒的加入可极大提高TiCp/30CrNi4Mo复合材料的耐磨损性能,干摩擦和油摩擦条件下都表现出了优异的耐磨损性能,且在高速高载荷下显示了更为显著的优势,200 N载荷下400 r/min干摩擦30 min,TiCp/30CrNi4Mo复合材料的质量磨损量仅为铸态30CrNi4Mo材料的1/16左右;400 N载荷下200 r/min干摩擦30 min,TiCp/30CrNi4Mo复合材料的质量磨损量仅为30Cr Ni4Mo的1/10左右。干摩擦时载荷增加,TiCp/30Cr Ni4Mo复合材料的摩擦因数先上升后下降,随滑动速度增加,摩擦因数减小。干摩擦时,在不同载荷和滑动速度下,TiCp/30CrNi4Mo复合材料主要表现为轻微的磨粒磨损,显示出良好的耐磨损性能。30CrNi4Mo composite with 30%TIC particles （volume precentage） was prepared by high energy ball milling and hot pressing （HP）. Microstructure, particles distribution, mechanical properties and wear resistance of the composites were investigated. The results show that： the composites prepared by hot pressing have relatively uniform TiC particles distribution, the TiC particles has a firm bond with the matrix which is composed of pearlite, ferrite and a little residual austenite; the relative density, apparent density, tensile strength, elongation and hardness of the TiCp/30CrNi4Mo composites are 97.6%, 6.83 g/cm3, 1 083 MPa, 1.0% and 53 HRC, respectively. The TiCv/30CrNi4Mo composites possess excellent wear resistance due to high TiC content incorporation in the 30CrNi4Mo matrix under both dry friction and oil lubricated friction, especially under high load and high velocity; the mass loss of TiCo/30CrNi4Mo composites is only 1/16 of that of the cast 30CrNi4Mo after 30min dry friction test at high sliding velocity （400 r/min） under a load of 200 N and only 1/10 of that of the cast 30CrNi4Mo after 30 min dry friction test at low sliding velocity （200 r/min） under a load of 400 N. With increasing load, the friction coefficient of TiCp/30CrNi4Mo composites increases first and then decreases under dry friction, but decreases with increasing sliding velocity. As for dry friction, the wear mode of the TiCv/30CrNi4Mo composites keeps slight adhesive wear under different load and sliding velocity, showing favorable wear resiteance.

关 键 词：热压 TIC颗粒 30CrNi4Mo 复合材料 摩擦磨损性能 

分 类 号：TF125.241[冶金工程—粉末冶金]