铌铸铁缸套表面矩形硬质相的磨损行为的有限元研究

Finite Research on the Wear Behavior of Rectangular Hard Phase on Niobium Casting Cylinder Surface

采用ANSYS软件建立了含规则形状硬质相(凸出缸套表面0.5μm)的铌缸套与活塞环的微凸体接触的平面模型,通过VonMises应力应变分布和硬质相塑性区域的分析,研究了表面硬质相的尺寸和接触表面摩擦因数对缸套磨损行为的影响。结果表明:硬质相太大或太小发生破坏的倾向都较大,当铌铸铁中的硬质相的大小控制在5μm左右且分布均匀时,可以使缸套的耐磨性得到优化;摩擦因数增大,粘着磨损发生的几率增大,即缸套发生拉缸的几率增大。

Several groups of contacting plan models （ different hard phases size and friction coefficient ） were created with the friction pair of niobium casting cylinders,which composed regular hard phases （whose surface is 0.5 μm higher than that of cylinder） ,and the microcosmic asperity of the piston ring. The distribution of stress and strain and the plastic areas of hard phases were analyzed, and the effect of the different euboid hard phases and friction coefficient on the wear behavior of niobium casting cylinders was studied. The results show that the defection possibility for hard phases becomes large when the size of hard phase becomes large or small, when the sizes of hard phase are about 5 μm and the distribution is uniform, the wear performance of cylinders is the best;On the other hand, the probability of adhesive friction becomes large along with the increase of the friction coefficient, and so did the cylinders.