TC4钛合金混粉电火花表面改性研究

发布时间：2018-04-02 13:03

本文选题：TC钛合金　切入点：微观组织　出处：《表面技术》2017年02期

【摘要】：目的通过混粉电火花加工方法,分别使用紫铜和石墨作为工具电极,获得综合性能较好的TC4钛合金表面。方法利用手持式TR200粗糙度仪对工件表面的粗糙度进行测量,用扫描电子显微镜(SEM)、X射线衍射仪对工件组织形貌和物相结构进行分析,用FM800型显微硬度计对工件表面进行显微硬度测量。结果在相同电参数下,紫铜电极加工的工件较石墨电极加工的工件表面粗糙度要低,硬度也相对低。当I=4.5A、tON=30?s时,紫铜电极加工的工件表面平均粗糙度值Ra=2.223?m,表面硬度约为600HV;石墨电极加工的工件表面平均粗糙度值Ra=2.796?m,表面硬度约为700HV。当I=9 A、tON=30?s时,紫铜电极加工的工件表面平均粗糙度值Ra=2.748?m,表面硬度约为650HV;石墨电极加工的工件表面平均粗糙度值Ra=3.705?m,表面硬度约为750HV。结论在不同电极条件下混粉电火花加工后,TC4钛合金工件表面都达到了强化的效果。
[Abstract]:Objective to obtain the surface of TC4 titanium alloy with better comprehensive properties by using copper and graphite as tool electrodes respectively by means of powder-mixed EDM. Methods the roughness of workpiece surface was measured by hand-held TR200 roughness instrument. The microstructure and phase structure of the workpiece were analyzed by scanning electron microscope (SEM), and the microhardness of the workpiece surface was measured by FM800 microhardness meter. The surface roughness and hardness of the workpiece machined by copper electrode are lower than that by graphite electrode. The average surface roughness of the workpiece processed with copper electrode is 2.223? The surface hardness of the workpiece is about 600HV.The average surface roughness of the workpiece machined by graphite electrode is 2.796? The surface hardness is about 700HV. The average surface roughness of the workpiece processed with copper electrode is 2.748? The surface hardness of the workpiece is about 650HV.The average roughness value of the workpiece machined by graphite electrode is 3.705? The surface hardness is about 750 HV. Conclusion the surface of TC4 titanium alloy can be strengthened after EDM with mixed powder under different electrode conditions.
【作者单位】：山东理工大学机械工程学院;
【基金】：国家自然科学基金(51105235)~~
【分类号】：TG178;TG661

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