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铁路车轮轮辋区域成分、结构与硬度的定量分布表征及相关性研究

Quantitative Distribution Characterization and Correlation Study of Composition, Structure and Hardness of Rim Region in Railway Wheel.

作者信息

Li Dongling, Wang Haizhou, Shen Xuejing, Lin Shuangping, Feng Haozhou, Peng Ya, Jiang Fan, Zhou Xuefan

机构信息

Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing 100081, China.

Central Iron & Steel Research Institute, Beijing 100081, China.

出版信息

Materials (Basel). 2022 Jul 7;15(14):4762. doi: 10.3390/ma15144762.

DOI:10.3390/ma15144762
PMID:35888229
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9324461/
Abstract

The railway wheel is the key component of high-speed railway train. To assure the safety in service, higher requirements are put forward in this study for the composition, microstructure uniformity, and comprehensive properties of wheel materials. In this paper, the high throughput quantitative distribution characterization methods of composition, microstructure, inclusions and Vickers hardness of high-speed railway wheel materials based on the spark source original position analysis technique, high throughput scanning electron microscope (SEM) combined with image batch processing technology, and automatic two-dimensional quantitative distribution analysis technique of inclusions and micro hardness have been studied. The distribution trend of the content of nine elements, size and quantity of sulfides and oxides, ferrite area fraction, and Vickers hardness from the wheel tread surface to the radial depth of about 50 mm below the surface has been discussed. The influence of inclusions distribution on the element segregation and the effect of rim-chilling process with different water spraying angle on the distribution of microstructure and micro hardness have been investigated. It was found that unsynchronized cooling on both sides of the rim altered the phase behavior of ferrite and pearlite and obvious inhomogeneity distribution of ferrite appeared, which led to the asymmetrical Vickers hardness in areas near or away from the flange. Based on the quantitative characterization of area fraction and micro hardness on the same location of wheel rim, a statistical mapping relationship between ferrite area fraction and Vickers hardness was established.

摘要

铁路车轮是高速铁路列车的关键部件。为确保服役安全，本研究对车轮材料的成分、微观结构均匀性和综合性能提出了更高要求。本文研究了基于火花源原位分析技术、高通量扫描电子显微镜（SEM）结合图像批量处理技术以及夹杂物和显微硬度自动二维定量分布分析技术的高速铁路车轮材料成分、微观结构、夹杂物和维氏硬度的高通量定量分布表征方法。讨论了从车轮踏面表面到表面以下约50mm径向深度范围内9种元素含量、硫化物和氧化物的尺寸和数量、铁素体面积分数以及维氏硬度的分布趋势。研究了夹杂物分布对元素偏析的影响以及不同喷水角度的轮辋激冷工艺对微观结构和显微硬度分布的影响。发现轮辋两侧冷却不同步改变了铁素体和珠光体的相行为，出现了明显的铁素体不均匀分布，导致靠近或远离轮缘区域的维氏硬度不对称。基于轮辋同一位置的面积分数和显微硬度的定量表征，建立了铁素体面积分数与维氏硬度之间的统计映射关系。

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本文引用的文献

1
Characterization of segregation degree for large size metal component and application on high-speed train wheel.大尺寸金属构件偏析程度的表征及其在高速列车车轮上的应用。
Anal Chim Acta. 2022 Apr 22;1203:339719. doi: 10.1016/j.aca.2022.339719. Epub 2022 Mar 12.
2
Influence of Contact Stress on Surface Microstructure and Wear Property of D2/U71Mn Wheel-Rail Material.接触应力对D2/U71Mn轮轨材料表面微观组织及磨损性能的影响
Materials (Basel). 2019 Oct 8;12(19):3268. doi: 10.3390/ma12193268.
3
The influence of wheel/rail contact conditions on the microstructure and hardness of railway wheels.
轮轨接触条件对铁路车轮微观结构和硬度的影响。
ScientificWorldJournal. 2014 Jan 16;2014:209752. doi: 10.1155/2014/209752. eCollection 2014.