Optimization of several surface treatment processes for alleviating fretting damage of a locking pin
作者机构：School of Mechanical EngineeringSouthwest Jiaotong UniversityChengdu 610031China Traction Power State Key LaboratorySouthwest Jiaotong UniversityChengdu 610031China School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China
出 版 物：《Friction》 (摩擦（英文版）)
年 卷 期：2022年第10卷第8期
页 面：1217-1233页
核心收录：
学科分类：08[工学] 0817[工学-化学工程与技术] 080203[工学-机械设计及理论] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）]
基 金：This work was supported by the National Natural Science Foundation of China(Grant No.51627806).
主 题：locking pin fretting wear surface treatment dynamic response wear mechanism
摘 要：The operational safety and reliability of a variable gauge train are affected by the anti-fretting wear performance of the locking mechanism.The main purpose of this study is to optimize the surface treatment process for a locking pin material under actual service conditions to alleviate fretting damage.Based on the two basic principles of surface strengthening and friction reduction,a substrate(AISI 4135 steel)surface was treated by laser quenching(LQ),plasma nitriding(PN),and bonded MoS2 coating.Systematic fretting wear tests were conducted,and the wear behavior and damage mechanism of various treated surfaces were comprehensively investigated.The results indicate that the wear resistances of the LQ-and PN-treated surfaces were significantly improved,and their main wear mechanisms were abrasive wear,delamination,and oxidation wear.The MoS_(2) coating exhibits the lowest friction coefficient and energy dissipation due to its self-lubricating property,but it incurs the highest wear rate and failure in the form of plastic deformation.Furthermore,the rough compound layer with a high hardness on the PN-treated surface is conducive to the formation and maintenance of the third-body contact at the fretting interface,consequently resulting in a significant reduction in wear.An optimal surface treatment process for alleviating fretting damage of the locking pin is recommended via comprehensive evaluation,which provides a reference for the anti-fretting protection of related mechanical components.
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