FeCr合金波纹形貌对滚滑摩擦性能影响的原子分析  

Atomic Analysis of the Effect of Wavy Morphology on the Rolling-sliding Frictional Properties of FeCr Alloys

作　　者：吴灿 孙虎儿[1,2] 杨超毅 WU Can;SUN Huer;YANG Chaoyi(Mechanical Engineering College,North University of China,Taiyuan 030051,China;Shanxi University of Electronic Science and Technology,Shanxi Linfen 041000,China)

机构地区：[1]中北大学机械工程学院,太原030051 [2]山西电子科技学院,山西临汾041000

出　　处：《精密成形工程》2024年第8期165-172,共8页Journal of Netshape Forming Engineering

基　　金：山西省基础研究计划(202103021223196)。

摘　　要：目的研究FeCr合金不同表面波纹形貌对滚滑摩擦力学特性的影响,旨在指导高精密零件表面加工。方法采用分子动力学方法构建了光滑表面、一维和二维正弦波纹表面。综合分析了不同形貌特征对纳米压痕和滚滑摩擦过程中FeCr合金的变形、亚表面损伤以及摩擦性能的影响。结果在纳米压痕试验中,光滑表面接触面积最大,受压后变形最大,且压痕力与接触面积呈正相关。不同表面形貌的塑性变形临界压深存在显著差异,其中二维正弦波纹表面的临界压深最大。在纳米滚滑摩擦试验中,原子相互作用占主导作用,在3种表面中,光滑表面摩擦力和摩擦因数最高。在纯滑动或高速滚动时,一维正弦波纹表面的摩擦因数最小。此外,在摩擦试验中,磨损原子堆积高度、分布与界面形貌特征、滚动速度相关。磨屑原子堆积的体积和高度与接触面积呈正相关,与滚动速度呈负相关。二维正弦波纹表面磨屑原子堆积高度最低,亚表面最为稳定。结论波纹形貌表面能够减小实际接触面积,密集的波峰和波谷能够减小材料的变形,提高亚表面稳定性。The work aims to investigate the effect of different surface wavy morphologies on the rolling-sliding frictional mechanical properties of FeCr alloys,so as to guide the surface processing of high-precision components.The molecular dy-namics was used to construct smooth surfaces and one-dimensional and two-dimensional sinusoidal wavy surfaces.Comprehen-sive analysis was conducted on the impact of various morphological characteristics on the deformation,subsurface damage,and frictional properties of FeCr alloy during nanoindentation and rolling-sliding friction.In nanoindentation experiments,the smooth surface had the largest contact area and underwent the greatest deformation after compression,and the indentation force was directly proportional to the contact area.Significant differences existed in the critical indentation depth for plastic deforma-tion across different surface morphologies,with the two-dimensional sinusoidal wavy surface having the largest critical depth.In the nano rolling-sliding friction experiments,atomic interaction played a dominant role,and among the three surfaces,the smooth surface exhibited the highest friction force and friction coefficient.During pure sliding or high-speed rolling,the one-dimensional sinusoidal wavy surface had the lowest friction coefficient.Additionally,in the friction experiments,the accu-mulation height and distribution of worn atoms were related to the interface morphology characteristics and rolling speed.The volume and height of accumulated worn atoms were positively correlated with the contact area and negatively correlated with the rolling speed.The two-dimensional sinusoidal wavy surface had the lowest accumulation height of worn atoms,indicating the most stable subsurface.Wavy surface morphologies are capable of reducing the actual contact area,and the dense arrange-ment of wave peaks and valleys can decrease material deformation,thereby enhancing subsurface stability.

关 键 词：正弦表面 纳米压痕 滚滑摩擦磨损 接触 分子动力学 

分 类 号：TG339[金属学及工艺—金属压力加工]