(1. 西北工業(yè)大學 航空學院，西安 710072；2. 太原理工大學 表面工程研究所，太原 030024)
摘 要: 采用Mo電極分別在空氣和硅油中對Ti811鈦合金表面進行電火花強化處理(ESS)，探討消除強化層中裂紋缺陷的途徑。將ESS與噴丸強化復合，擬使Ti合金微動疲勞(FF)抗力得到顯著改善。結果表明：Mo電極在空氣中電火花強化處理Ti811鈦合金表面后，強化層出現(xiàn)明顯的微裂紋缺陷，由此導致其微動疲勞抗力降低。在硅油中用Mo電極電火花處理Ti811合金不僅消除了表面裂紋缺陷，而且使鈦合金表面具有良好的減摩潤滑作用，顯著改善了鈦合金基材的耐磨性能；再經(jīng)噴丸強化處理，使鈦合金基材的微動疲勞抗力顯著提高。
關鍵字: 鈦合金；微動疲勞；電火花表面強化；噴丸；摩擦磨損
（1. School of Aeronautics, Northwestern Polytechnical University,Xi’an 710072, China;2. Research Institute of Surface Engineering, Taiyuan University of Technology,Taiyuan 030024, China）
Abstract:The surface of Ti811 alloy was treated by electrospark surface strengthening (ESS) with Mo electrode in the air and in the silicone oil environment to explore ways to eliminate the strengthening layer cracks and flaws. ESS was combined shot peening in order to synergistically improve the fretting fatigue (FF) resistance of Ti alloy. The results show that the Ti811 alloy treated by ESS in the air induces the Ti alloy surface cracking, which leads to its fretting fatigue resistance decreasing. The Ti811 alloy treated by ESS in the silicone oil not only eliminates the surface micro cracks, but also significantly improves the wear resistance of Ti alloy due to the better lubrication. The fretting fatigue resistance of Ti alloy is also improved synergistically by ESS in the silicone oil combined shot peening post treatment
Key words: titanium alloy; fretting fatigue; electrospark surface strengthening; shot peening; friction and wear
