润滑剂浓度对钛合金Ti-6.5Al-4V-0.15B丝材拉拔表面质量的影响研究

Study on Influence of Lubricant Concentration on Drawing Surface Quality of Titanium Alloy Ti-6.5Al-4V-0.15B Wire

研究首次对钛合金Ti-6.5Al-4V-0.15B丝材拉拔摩擦磨损行为进行了分析;在此基础上,研究分析三种润滑剂浓度(25%、40%、55%)下拉拔后的丝材表面微观形貌。结果表明,丝材表面呈现三层结构,即基体、氧化层、润滑剂涂层,符合氧化磨损的典型特征;润滑剂浓度过低导致氧化层增厚、摩擦磨损量增加;润滑剂浓度过高使得附着的润滑剂过多且形成过宽的氧化层裂缝会导致基体层的更大损伤,最终确定润滑剂浓度为40%。进一步分析研究了拉拔各典型道次在选定浓度的润滑剂作用下的表面微观形貌演变。

The friction and wear behavior of titanium alloy ti-6.5 al-4v-0.15 B wire drawing is analyzed for the first time in this study.On this basis,the surface morphology of the wire after drawing with three lubricant concentrations(25%,40%,55%)is studied.The results show that there are three layers on the surface of the wire,namely the substrate,the oxide layer and the lubricant coating,which conform to the typical characteristics of oxidative wear.The low concentration of lubricant leads to the thickening of oxide layer and the increase of friction and wear.Too high lubricant concentration will cause too much attached lubricant and form too wide oxide layer cracks,which will lead to greater damage to the matrix layer,and the lubricant concentration is finally determined to be 40%.the surface morphology evolution of each typical drawing pass under the action of selected concentration of lubricant is further analyzed and studied.