(1. 西南交通大學(xué) 牽引動力國家重點實驗室 摩擦學(xué)研究所，成都 610031；
2. 浙江工業(yè)大學(xué) 過程裝備及其再制造教育部工程研究中心，杭州 310032)
摘 要: 在新型扭轉(zhuǎn)復(fù)合微動試驗機(jī)上，以7075鋁合金平面/GCr15鋼球配副為研究對象，研究不同接觸載荷對7075鋁合金扭轉(zhuǎn)復(fù)合微動磨損行為的影響。在動力學(xué)特性分析的基礎(chǔ)上結(jié)合磨痕形貌微觀觀察，研究7075鋁合金扭轉(zhuǎn)復(fù)合微動的磨損機(jī)理。結(jié)果表明：接觸載荷明顯地改變微動運行區(qū)域，隨著接觸載荷的增加，微動推遲進(jìn)入混合區(qū)和滑移區(qū)，且混合區(qū)逐漸擴(kuò)大；在相同的微動運行區(qū)域內(nèi)，F(xiàn)t/Fn系數(shù)隨循環(huán)次數(shù)增加的變化趨勢受接觸載荷的影響不大，但Ft/Fn系數(shù)隨著法向接觸載荷的增加依次降低；在其它參量不變的情況下，接觸載荷越大，微動更趨向于受扭動微動分量控制，表面損傷伴隨著明顯的剝落。扭轉(zhuǎn)復(fù)合微動的磨損機(jī)制主要為磨粒磨損、氧化磨損和剝層。
關(guān)鍵字: 7075鋁合金；扭轉(zhuǎn)復(fù)合微動；接觸載荷；磨損行為
（1. Tribology Research Institute, Traction Power State Key Laboratory, Southwest Jiaotong University,
Chengdu 610031, China;
2. Engineering Research Center of Process Equipment and Its Remanufacture, Ministry of Education,
Zhejiang University of Technology, Hangzhou 310032, China）
Abstract:On an advanced dual-rotary fretting rig, the dual-rotary fretting (DRF) wear behavior of 7075 Al alloy flat against GCr15 steel ball was investigated with various contact loads. Thus, the effect of contact load on the DRF wear behavior was examined. Based on the analysis of the frictional kinetics and the observation of wear morphologies, the damage characteristics of 7075 Al alloy were discussed in detail. The results show that the fretting regimes change with the variation of the contact load, the gross slip regime and mixed fretting regime of dual-rotary fretting are postponed, and the mixed fretting regime is broadened slowly. Under the same fretting regime, the Ft/Fn presents a same trend of evolution with the increase of the cycles, while the effect is insignificant with the increase of contact load. The value of Ft/Fn decreases with the increase of the contact load. With the increase of the contact load, the fretting is more approachable to control by torsional fretting component under a higher contact load, obviously accompanies with detachment. The wear mechanisms of DRF are mainly abrasive wear, oxidative wear and delamination.
Key words: 7075 Al alloy; dual-rotary fretting; contact process; wear behavior
