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在新型扭转复合微动试验机上,以7075合金平面/GCr15钢球配副为研究对象,研究水介质对7075合金扭转复合微动磨损行为的影响.在微动动力学特性分析的基础上结合磨痕形貌微观分析,研究水介质环境下7075合金扭转复合微动的磨损机理.结果表明:水介质对扭转复合微动运行和损伤机制存在显著影响,水介质明显地改变了微动运行区域;相比干态,在部分滑移区和混合区,水介质下的剥层现象更加明显,水介质加速了微动损伤.在滑移区,磨损机制主要转变为以磨粒磨损为主,湿润的磨屑能有效降低表面摩擦系数和减缓微动损伤;而单一的水介质会加剧材料的磨损.此外,水介质和干态微动环境中不同倾斜角度下的磨损体积均与累积耗散能分别呈不同的线性关系.
The effect of aqueous media on the torsional composite fretting wear behavior of 7075 alloy was studied on a novel torsion compound fretting tester with 7075 alloy plane / GCr15 steel ball as the research object.On the basis of the analysis of micro-dynamic characteristics, The results show that aqueous medium has a significant effect on the twisting composite fretting and damage mechanisms, and the aqueous medium obviously changes the fretting operating area. Compared with the dry state, the phenomenon of delamination is more obvious in the partial slip zone and the mixed zone, and the aqueous medium accelerates the fretting damage. In the slip zone, the wear mechanism mainly changes to abrasive wear, wetting Of the wear debris can effectively reduce the surface friction coefficient and slow the fretting damage; and a single aqueous medium will aggravate the material wear and tear.In addition, the water medium and dry fretting environment at different angles of wear wear volume and cumulative dissipation energy Respectively, showed a different linear relationship.