不锈钢材料预应力磨削表面耐蚀性能数值模拟

为探究预应力磨削后表面腐蚀演变机理及磨削参数对不锈钢耐蚀性的影响,以304不锈钢为研究对象,建立了考虑预应力磨削表面形貌特征的不锈钢耐蚀性能数值模型.首先,推导了粗糙表面腐蚀场演变的相场方程.其次,建立了预应力磨削后工件表面形貌模型.最后,搭建了具有非高斯分布磨粒特征的自相关砂轮表面地貌模型,应用所建模型探究了不锈钢材...

Numerical Simulation on Corrosion Resistance of Pre-stress Grinding Surface of Stainless Steel

In order to explore the evolution mechanism of surface corrosion of pre-stress grinding and the influence of grinding parameters on the corrosion resistance of stainless steel， 304 stainless steel was taken as the research object， a numerical model considering the influence of pre-stress grinding surface topography on the corrosion resistance of stainless steel was established. Firstly， the phase field equation for the corrosion field of rough surfaces was derived. Secondly， the surface topography model of the workpiece of pre-stress grinding was established. Finally， an auto-correlation wheel surface model with non-Gaussian distribution characteristics was built. With all the built models， the corrosion resistance of pre-stressed grinding surfaces was explored. Compared with the existing research results， the conclusions obtained conform to the general law， which verifies the rationality of the proposed method. The results showed that the pre-stress grinding surface has the "polishing effect" in the corrosive environment. As the corrosion time extends， the surface corrosion resistance is enhanced. In the condition of using coolant， appropriately increasing the pre-stress， wheel speed， and reducing feed speed can improve the corrosion resistance of the machined surface. When the pre-stress is a fixed value， the method of optimizing the linear speed and feed speed of the grinding wheel could also be used to further improve the corrosion resistance of the stainless steel workpiece.