纯铜表面机械扭压处理工艺参数对其显微硬度的影响

Effect of surface mechanical pressure-torsion process parameters on microhardness of pure copper

对T2纯铜表面进行机械扭压处理(SMPT)后,分别研究SMPT工艺参数中的工具头转速、水平进给速度、下压深度、处理次数以及润滑方式对材料表面显微硬度的影响。结果表明:当转速由3000 r/min上升至5000 r/min时,材料表面显微硬度逐渐增加,当转速达到6000 r/min时显微硬度呈下降趋势;工具头水平进给速度对材料表层显微硬度影响较小;下压深度的增加可以提高材料表层显微硬度;当处理次数为3次时显微硬度达到最大值;采用水润滑方式效果要大于采用油润滑方式效果,而采用高温润滑脂效果最差。

T2 pure copper surface was dealed by surface mechanical pressure-torsion（SMPT）,the effects of the technical parameters,such as the speed,horizon feed speed,pushing depth,treatment times as well as lubrication method,on the microhardness of material surface were studied.The results show that the microhardness of the material surface increases with the speed increasing from 3000 r/min to 5000 r/min.While the microhardness decreases when the speed increases to6000 r/min.In addition,the effect of the horizon feed speed on the hardness is slight.The microhardness increases with the increase of pushing depth.The microhardness reaches the maximum after treatment for 3 times.The effect of lubrication method using water is better than that using oil,and the effect using high temperature grease is the worst.