在不同旋转速度下对工业纯钛板进行3道次搅拌摩擦加工(FSP),研究了 FSP 区的显微组织、硬度及摩擦磨损性能,并分析了纯钛板FSP前后的磨损形貌及磨损机制.结果表明：搅拌区组织发生了剧烈的塑性变形,形成了细小均匀的再结晶组织,且随着旋转速度提高,晶粒明显细化；FSP区的最高显微硬度可达到430 HV,较基体的(230 HV)提升了87％；FSP区的平均摩擦因数和磨损率分别可达0．24和5．36×10－4 mm3.N－1.m－1；基体的磨损机制为粘着磨损,FSP 区的磨损机制主要为磨粒磨损.
Three-pass friction stir processing (FSP)was carried out on pure titanium plates at different rotation speeds,microstructure,hardness and friction and wear properties of friction stir processed zone were studied,and wear morphology and mechanical of the titanium plates before and after FSP were analyzed.The results show that stir zone exhibited severe plastic deformation,this resulted in a uniform recrystallized microstructure. With the increase of rotation speed,grains of stir zone were further refined.The highest hardness of 430 HV was obtained in friction stir processed zone,improved by 87% compared to 230 HV of the substrate.Average friction coefficient and wear rate of friction stir processed sample were 0.24 and 5.36×10-4 mm3.N-1.m-1 .Wear mechanism of the substrate was adhesive wear,and that of friction-stir processed sample mainly was abrasive wear.
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