磨屑对Inconel718激光熔覆合金层微动磨损行为的影响  

The Influences of Wear Debris on the Fretting Wear Behavior of Inconel718 Laser Cladding Alloy Layer

作　　者：徐志彪 谢森 王校益 李德香 吕笑文 XU Zhibiao;XIE Sen;WANG Xiaoyi;LI Dexiang;LYU Xiaowen(School of Rail Transportation,Wuyi University,Jiangmen 529020,China;College of Intelligent Manufacturing,Guangzhou Maritime University,Guangzhou 510725,China)

机构地区：[1]五邑大学轨道交通学院,广东江门529020 [2]广州航海学院智能制造学院,广东广州510725

出　　处：《材料保护》2024年第10期45-51,101,共8页Materials Protection

基　　金：国家自然科学基金(52105202);2023年五邑大学“创新创业基金”(2023111500000416)。

摘　　要：微动磨损是由紧密接触表面之间的微小振动引发的一种材料损伤现象。研究磨屑在微动磨损过程中的作用,对于揭示材料在微动磨损过程中的损伤演化具有重要意义。利用激光熔覆技术在锻造成形的Inconel合金基材表面制备了Inconel718合金熔覆层,采用球/平面点接触方式在多功能摩擦磨损试验机上对Inconel718激光熔覆合金层进行微动磨损试验。试验结束后,通过分析F_(t)-D(摩擦力-位移)曲线和COF(摩擦系数)曲线,得到微动磨损过程中的力学动态特性;利用扫描电子显微镜(SEM)和三维形貌仪(3D)分析接触界面的损伤形态,揭示其微动磨损的主要损伤机理;运用粒径分布计算软件(Nano Measurer)对磨屑粒径分布进行统计。结果表明,磨屑粒径尺寸主要分布在1~3μm之间;位移幅值的大小与磨屑排出速度成正相关关系,在大的位移幅值下,磨屑体型较大,易造成磨粒磨损,而在小的位移幅值下,磨屑易堆积从而阻碍磨损的进行;在大的法向载荷下,磨屑产生速度加快并会加剧试样表面损伤,此时疲劳磨损和磨粒磨损起主导作用;而在小的法向载荷下,磨屑能减少摩擦力和摩擦系数;此外,磨屑去除与否不改变微动运行状态。Fretting wear is a material damage phenomenon caused by small vibrations between tightly contacting surfaces.Studying the role of debris in fretting wear is of great significance for revealing the damage evolution of materials during fretting wear.In this work,a fretting wear test was conducted on Inconel718 laser cladding alloy layer using ball/plane point contact method on a multifunctional friction and wear testing machine.After the experiment,the mechanical dynamic characteristics during fretting wear process are obtained by analyzing the F_(t)-D(friction displacement)curve and COF(coefficient of friction)curve.In addition,scanning electron microscopy(SEM)and three-dimensional profilo-meter(3D)were used to analyze the damage morphology of the contact interface and reveal the main damage mechanism of micro motion wear.The particle size distribution calculation software(Nano Measurer)was employed to statistically analyze the particle size distribution of abra-sives.Results showed that the particle size of abrasive debris is mainly distributed between 1~3μm,and the magnitude of displacement ampli-tude was positively correlated with the speed of debris discharge.At large displacement amplitudes,the size of the debris was relatively large,which could easily cause abrasive wear,while at small displacement amplitudes,debris was prone to accumulate and hinder the progress of wear.Moreover,under high normal loads,the generation of debris accelerated and exacerbated surface damage to the specimen,with fatigue wear and abrasive wear playing a dominant role.Under small normal loads,debris could reduce the friction force and friction coefficient.In ad-dition,the removal of debris would not change the fretting regime.

关 键 词：微动磨损 磨屑颗粒 INCONEL718合金 损伤演变 

分 类 号：TH117.1[机械工程—机械设计及理论]