Experimental study of wear and rolling contact fatigue in railway wheel steels coupled with various brake block materials: Insights from innovative small-scale testing

IF 5.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Wear Pub Date : 2024-09-06 DOI:10.1016/j.wear.2024.205558
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引用次数: 0

Abstract

This study presents a comprehensive analysis using an innovative testing method of two wheel steels paired with cast iron and organic composite brake block materials. By conducting tests under consistent conditions and varying in duration, the study examines temperature profiles, friction coefficients, surface characteristics, weight loss, and microstructural changes in wheel samples, emphasizing the distinct behaviour of these materials in braking applications and the damage evolution over time. The results demonstrate that organic composite brake samples outperform those in cast iron, showcasing smoother wheel sample surfaces and stable friction coefficients. Weight loss analysis reveals the environmental benefits of organic composite brakes, emitting fewer particulates than cast iron counterparts. Microstructural examinations uncover the formation of a Thermal White Etching Layer (T-WEL) on wheel samples tested with cast iron samples, leading to cracks and material detachment. Conversely, extended use of organic composite samples led to a "thermal fuse effect", impacting their efficiency and suggesting the need of careful temperature management in sustained braking scenarios. Despite significant differences in wheel steels, the study underscores the critical role of brake material in braking improvements. The findings not only enhance the scientific understanding of brake material behaviour but also introduce an innovative, cost-effective, and fast 4-contact machine testing method.

Abstract Image

铁路车轮钢与各种制动块材料的磨损和滚动接触疲劳实验研究:创新性小规模试验的启示
本研究采用创新的测试方法,对两种轮毂钢与铸铁和有机复合制动块材料进行了全面分析。通过在一致的条件下进行持续时间不同的测试,该研究检查了车轮样品的温度曲线、摩擦系数、表面特征、重量损失和微观结构变化,强调了这些材料在制动应用中的不同行为以及随着时间推移的损坏演变。结果表明,有机复合材料制动器样品的性能优于铸铁制动器样品,车轮样品表面更光滑,摩擦系数更稳定。重量损失分析表明,有机复合材料制动器比铸铁制动器排放的微粒更少,具有环保优势。微观结构检查发现,与铸铁样品一起测试的车轮样品上形成了热白色蚀刻层(T-WEL),导致裂纹和材料脱落。相反,长时间使用有机复合材料样品会导致 "热熔效应",影响其效率,并表明在持续制动情况下需要谨慎的温度管理。尽管车轮钢材存在显著差异,但这项研究强调了制动材料在制动改进中的关键作用。研究结果不仅加深了对制动材料性能的科学理解,还引入了一种创新、经济、快速的四接触机器测试方法。
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来源期刊
Wear
Wear 工程技术-材料科学:综合
CiteScore
8.80
自引率
8.00%
发文量
280
审稿时长
47 days
期刊介绍: Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.
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