珠光体纳米摩擦学行为的分子动力学模拟研究  

Molecular Dynamics Simulation of Nanotribological Behavior of Pearlite

作　　者：夏桥生 华东鹏 石烨然 周青[1] 王海丰[1] 邓想涛[2] 王昭东[2] XIA Qiaosheng;HUA Dongpeng;SHI Yeran;ZHOU Qing;WANG Haifeng;DENG Xiangtao;WANG Zhaodong(Center of Advanced Lubrication and Seal Materials,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Shaanxi Xi’an 710072,China;State Key Laboratory of Rolling and Automation,Northeastern University,Liaoning Shenyang 110819,China)

机构地区：[1]西北工业大学凝固技术国家重点实验室先进润滑与密封材料研究中心,陕西西安710072 [2]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《摩擦学学报（中英文）》2024年第6期800-810,共11页Tribology

基　　金：国家自然科学基金项目(52175188);陕西省重点研发计划项目(2023-YBGY-434);辽宁省航空发动机材料摩擦学重点实验室开放基金项目(LKLAMTF202301);中央高校基本科研业务费(3102019JC001)资助。

摘　　要：由于独特的叠层结构,铁素体和渗碳体能较好发挥协同作用,故珠光体组织表现出优异的摩擦学性能.然而,受试验技术限制,人们对珠光体优异摩擦学性能的机械起源认识仍不全面,尤其是在片层方向和片层厚度对珠光体摩擦学行为的影响方面.本文中采用分子动力学模拟方法研究了片层方向和片层厚度对珠光体划痕摩擦学行为的影响.结果表明:与平行于表面的片层方向相比,垂直于表面的片层方向表现出更优异的摩擦学行为,其塑性影响区深度更小,磨损原子数量也较少.对于具有垂直于表面片层方向的珠光体,片层厚度对塑性影响区深度基本无影响,但摩擦力、摩擦系数和磨损原子数目随着片层厚度的减小而减小.此处,片层厚度与磨痕形貌紧密相关.本工作有助于人们理解珠光体片层方向和片层厚度与摩擦变形微观机制之间的关联,可为设计具有更优异摩擦学性能的珠光体钢提供一定理论指导.The pearlite microstructure exhibits excellent tribological properties due to its unique layered structure,which allows the synergistic effect between ferrite and cementite.However,due to technical limitations,the mechanical origin of the superior tribological properties of pearlite is still not fully understood,especially in terms of the effects of layer direction and layer thickness on tribological behavior of pearlite.In this study,the effects of layer direction and layer thickness on the nano-scratching tribological behavior of pearlite were investigated by molecular dynamics simulation.The results indicated that compared with the layer direction parallel to the surface,the layer direction perpendicular to the surface performs better tribological behavior with a smaller depth of the plastic affected region and a fewer number of the wear atoms.For pearlite with layer direction perpendicular to the surface,the thickness of the layer had a little effect on the depth of the plastic affected region,but the friction force,friction coefficient and number of the wear atoms decreased with the decrease of the layer thickness.In particular,the thickness of the layer was closely related to the morphology of the pile-up.This work contributed to the understanding of the relationship between the layer direction and the layer thickness of pearlite and the microscopic mechanism of tribological deformation,which provided the theoretical guidance for designing pearlitic steel with outstanding tribological properties.

关 键 词：珠光体 片层方向 片层厚度 纳米划痕 分子动力学模拟 

分 类 号：TH117.1[机械工程—机械设计及理论] TG142.1[一般工业技术—材料科学与工程]