论文部分内容阅读
利用双辉等离子表面冶金技术,在不同温度下对Ti_2AlNb合金进行渗碳处理。研究不同渗碳温度对Ti_2AlNb合金微观组织、显微硬度及摩擦磨损性能的影响。结果表明:整个渗碳层包括石墨沉积层、硬质碳化物层和扩散层,其厚度随渗碳温度的增加而增加。从硬质碳化物层到基体,试样硬度呈梯度递减规律;且工艺温度越高,渗碳硬度曲线越平缓。在970、1050和1100℃制备的渗碳试样的比磨损率分别是基体的1/14.67,1/14.96和1/16.64,其平均摩擦因数均小于基体,表现出良好的减摩和耐磨性能,磨损机制为磨粒磨损。
The surface of Ti_2AlNb alloy was carburized at different temperatures by double glow plasma surface metallurgy. The effects of different carburizing temperature on microstructure, microhardness and friction and wear properties of Ti_2AlNb alloy were studied. The results show that the entire carburized layer includes graphite deposit, hard carbide layer and diffusion layer. The thickness increases with the increase of carburizing temperature. From the hard carbide layer to the substrate, the hardness of the sample showed a gradient decreasing rule; and the higher the process temperature, the smoother the carburization hardness curve. The specific wear rates of carburized samples prepared at 970, 1050 and 1100 ℃ were 1 / 14.67, 1 / 14.96 and 1 / 16.64, respectively, which were lower than that of the matrix and showed good friction and wear resistance Performance, wear mechanism for abrasive wear.