(1. 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；
2. 西南交通大學(xué) 牽引動力國家重點(diǎn)實(shí)驗(yàn)室，成都 610031)
摘 要: 采用球/平面接觸方式，考察7075鋁合金在VG46油潤滑工況下不同傾斜角度和角位移幅值對扭轉(zhuǎn)復(fù)合微動磨損特性的影響。利用光學(xué)顯微鏡(OM)、掃描電子顯微鏡(SEM)分析7075鋁合金的磨痕表面及剖面形貌、磨損機(jī)制，用雙模式表面輪廓儀分析磨損體積。結(jié)果表明：潤滑油對扭轉(zhuǎn)復(fù)合微動運(yùn)行和損傷機(jī)制存在顯著影響，潤滑油明顯改變微動運(yùn)行區(qū)域，隨著傾斜角度的增加，微動的混合區(qū)逐漸縮小甚至完全消失。微動運(yùn)行區(qū)域?qū)櫥偷臐櫥阅芤灿兄匾绊懀诓糠只茀^(qū)，微滑僅發(fā)生在接觸邊緣，潤滑油對微動的影響甚微；在混合區(qū)，潤滑油滲入表面微裂紋加速了疲勞裂紋的擴(kuò)展；在滑移區(qū)，接觸界面間形成了潤滑油膜，顯著地減緩了微動損傷。
關(guān)鍵字: 7075鋁合金；微動磨損；扭轉(zhuǎn)復(fù)合；潤滑油；損傷機(jī)制
（1. Engineering Research Center of Process Equipment and Its Remanufacture, Ministry of Education,
Zhejiang University of Technology, Hangzhou 310032, China;
2. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China）
Abstract:The dual-rotary fretting wear behaviors of 7075 aluminium alloy flats against GCr15 steel ball in VG46 oil were studied under various tilt angles and angular displacement amplitudes. The kinetic behaviors of the dual-rotary fretting of 7075Al/GCr15 contact pairs were analyzed. The fretting scars surface damages, cross-section morphologies and wear mechanisms were characterized through optical microscope (OM) and scanning electrical microscope (SEM), and the wear volume was measured by dual mode surface profilometer. The results show that the oil has significant effect on the fretting running characteristics and the damage mechanisms, the fretting running condition can be obviously changed by oil media. With the increase of the tilt angles, the mixed fretting regime gradually decreases or even disappears completely. In addition, the lubricating properties are also strongly dependent upon the fretting running regimes. In partial slip regime (PSR), the micro-slip only occurs in the contact edge, and the lubricating oil has a very small influence on the fretting damage. In mixed fretting regime (MFR), the oil can easily penetrate into the micro-cracks on the surface and promote the propagation of cracks. In slip regime (SR), the lubricating oil can effectively mitigate DRF damage, because the oil can penetrate into the contact interface and form a lubricant film.
Key words: 7075 aluminium alloy; fretting wear; dual-rotary; lubricating oil; damage mechanism
