CAJ | 학술논문

采用球/平面接触方式，考察7075铝合金在VG46油润滑工况下不同倾斜角度和角位移幅值对扭转复合微动磨损特性的影响。利用光学显微镜(OM)、扫描电子显微镜(SEM)分析7075铝合金的磨痕表面及剖面形貌、磨损机制，用双模式表面轮廓仪分析磨损体积。结果表明：润滑油对扭转复合微动运行和损伤机制存在显著影响，润滑油明显改变微动运行区域，随着倾斜角度的增加，微动的混合区逐渐缩小甚至完全消失。微动运行区域对润滑油的润滑性能也有重要影响，在部分滑移区，微滑仅发生在接触边缘，润滑油对微动的影响甚微；在混合区，润滑油渗入表面微裂纹加速了疲劳裂纹的扩展；在滑移区，接触界面间形成了润滑油膜，显著地减缓了微动损伤。
채용구/평면접촉방식，고찰7075려합금재VG46유윤활공황하불동경사각도화각위이폭치대뉴전복합미동마손특성적영향。이용광학현미경(OM)、소묘전자현미경(SEM)분석7075려합금적마흔표면급부면형모、마손궤제，용쌍모식표면륜곽의분석마손체적。결과표명：윤활유대뉴전복합미동운행화손상궤제존재현저영향，윤활유명현개변미동운행구역，수착경사각도적증가，미동적혼합구축점축소심지완전소실。미동운행구역대윤활유적윤활성능야유중요영향，재부분활이구，미활부발생재접촉변연，윤활유대미동적영향심미；재혼합구，윤활유삼입표면미렬문가속료피로렬문적확전；재활이구，접촉계면간형성료윤활유막，현저지감완료미동손상。
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.