Improving tribological properties of CP-Ti by in-situ fabrication of Ti-WC surface composite using a pinless WC-Co stirring tool  

使用无销WC-Co搅拌工具原位制造Ti-WC表面复合材料以增强CP-Ti的摩擦学性能

作　　者：Meisam ASHOURI Reza TAGHIABADI Mohammad EMAMI Morteza SAGHAFI YAZDI Iman ANSARIAN 

机构地区：[1]Department of Metallurgy and Materials Science,Imam Khomeini International University,Qazvin 3414896818,Iran [2]Department of Materials Science and Engineering,University of Bonab,Bonab 5551395133,Iran

出　　处：《Journal of Central South University》2024年第10期3688-3702,共15页中南大学学报（英文版）

摘　　要：A surface Ti-WC composite was fabricated on CP-Ti by surface friction stirring(SFS)using a pinless WC-Cotool at a processing window of 800−2500 r/min and 8−50 mm/min.At 1600 r/min-50 mm/min,a defect-free compositelayer with an average hardness of~HV 1170 is formed.The hardness was increased by WC and TiN reinforcingparticles,dissolved Co atoms in Ti,and the formation of ultrafine grains.WC particles were incorporated into the Tisubstrate owing to the intense frictional interaction/heating at the tool-plate interface(~1000℃),which led to strengthloss and wear of the tool.The Williamson-Hall analysis of the XRD peaks of the SFSed sample confirmed a significantlysmall crystallite size(~100 nm).Wear tests showed that the wear resistance of the composite structure was about 4.5times higher than that of the CP-Ti.Friction analysis revealed a significant reduction in average value and fluctuations ofthe friction coefficient.使用无销WC-Co工具,在800~2500 r/min和8~50 mm/min的加工窗口下,通过表面摩擦搅拌(SFS)在CP-Ti上制造Ti-WC表面复合材料。在1600 r/min和50 mm/min的条件下,形成平均硬度约为HV 1170的无缺陷复合层。WC和TiN增强颗粒、Ti中溶解的Co原子以及超细晶粒的形成提高了硬度。由于工具-板界面处的强烈摩擦相互作用/加热(~1000℃),WC颗粒被嵌入Ti基体中,导致工具的强度损失和磨损。对经表面搅拌摩擦处理样品的XRD峰的Williamson-Hall分析证实了微晶尺寸非常小(约100 nm)。磨损试验表明,复合材料结构的耐磨性能比CP-Ti高约4.5倍。摩擦分析显示摩擦系数的平均值和波动显着降低。

关 键 词：surface friction stirring CP-Ti Ti-WC surface composite HARDNESS wear 

分 类 号：TB33[一般工业技术—材料科学与工程] TH117[机械工程—机械设计及理论]