Mechanism of Pearlite Fragmentation in Hypereutectoid Rail Steel during Long-Term Service

IF 0.3 Q4 METALLURGY & METALLURGICAL ENGINEERING

Russian Metallurgy (Metally) Pub Date : 2026-10-06 DOI:10.1134/S0036029526700898

Yu. F. Ivanov, S. A. Nevskii, V. E. Gromov, M. A. Porfir’ev, D. D. Mikhailov

引用次数: 0

Abstract—The evolution of the structure and mechanical properties of hypereutectoid steel rails after transporting 175.9 million gross tons is investigated. A hardened surface layer with a thickness of 550–600 μm is observed. The nanohardness of this layer is found to be 1.6 times higher than that at a depth of 7 mm from the surface, while its Young’s modulus is observed to be 1.4 times higher. The mechanisms responsible for this improvement in mechanical properties are discussed. The fragmentation of pearlite grains is identified as a contributing factor. A mechanism for pearlite grain fragmentation and cementite plate decomposition is proposed and analyzed within the framework of autowave concepts.

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过共析钢轨钢长期使用中珠光体碎裂机理

摘要研究了过共析钢轨在运输1.759亿总吨后的组织和力学性能演变过程。表面有一层厚度为550 ~ 600 μm的硬化层。该层的纳米硬度比距表面7mm深度处的纳米硬度高1.6倍，杨氏模量高1.4倍。讨论了这种力学性能改善的机理。珠光体颗粒的破碎被认为是一个促成因素。在自波概念的框架下，提出并分析了珠光体颗粒破碎和渗碳体板分解的机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Russian Metallurgy (Metally) METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

0.70

自引率

25.00%

发文量

140

期刊介绍： Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.