电极对准干式电火花表面强化TC4强化层组织与性能影响  

Effect of Electrode Alignment on Microstructure and Properties of TC4 Strengthened by Powder-mixed Near-dry EDM

作　　者：刘士杰 蔡兰蓉 李敏[1,2] 陈立君 LIU Shijie;CAI Lanrong;LI Min;CHEN Lijun(Tianjin Key Laboratory of High Speed Cutting and Precision Manufacturing, Tianjin 300222,China;Tianjin University of Technology and Education, Tianjin 300222, China)

机构地区：[1]天津市高速切削与重点加工实验室,天津300222 [2]天津职业技术师范大学,天津300222

出　　处：《机床与液压》2019年第19期32-35,共4页Machine Tool & Hydraulics

基　　金：国家自然科学基金资助项目(51301121;51305301);天津市高校创新团队培养计划资助(TD12-5043)

摘　　要：以石墨、紫铜、钨为强化电极,分别在正极性和负极性条件下对TC4钛合金进行混粉准干式电火花表面强化,分析了强化层微观组织结构及性能。结果表明:石墨电极负极性加工得到细长枝状组织及花瓣状,铜电极、钨电极负极性加工得到饼状组织结构且叠加层明显;3种电极正极性加工均得到质地均匀茂盛的花瓣状组织。强化层硬度较基体材料均有大幅提升,其中石墨电极和钨电极负极性加工、铜电极正极性加工时的强化硬度均超过HV1000,最高约为基体的3.4倍。Using graphite,copper and tungsten as strengthening electrodes,the surface of TC4 titanium alloy is strengthened with powder-mixed near-dry Electrical-Discharge Machine(EDM)under positive and negative polarity,respectively.The effects of different electrodes and polarity on microstructure and properties of the strengthened layer were analyzed.The results show that the thin dendritic structure and petal shape are obtained by negative processing of graphite electrode,and the cake structure is obtained by negative polarity processing of copper electrode and tungsten electrode,and the superposition layer is obvious.The hardness of the strengthening layer is much higher than that of the base material,including the negative processing of graphite electrode and tungsten electrode,and the strengthening of copper electrode with positive polarity processing.The hardness is over HV1 000,the highest is about 3.4 times of the matrix.

关 键 词：混粉准干式电火花 TC4钛合金 电极 显微硬度 

分 类 号：TG178[金属学及工艺—金属表面处理]