Structural-Phase States in the Head of Special-Purpose Rails after Long-Term Operation

IF 0.4 Q4 METALLURGY & METALLURGICAL ENGINEERING

Russian Metallurgy (Metally) Pub Date : 2024-03-20 DOI:10.1134/S0036029523110083

Yu. F. Ivanov, M. A. Porfir’ev, V. E. Gromov, R. E. Kryukov, Yu. A. Shlyarova

引用次数: 0

Abstract

Transmission electron microscopy methods are used to analyze the changes in the structure, phase composition, and dislocation substructure in the head of long differentially hardened special-purpose DT400IK rails made of E90KhAF steel along the radius of fillet rounding at the surface and at a distance of 2 and 10 mm from it after a passed tonnage of 187 mln t during field tests. Bend extinction contours, which indicate an elastic-stressed state of the rail head as a result of long-term operation, are found to form. The sources of lattice curvature torsion are revealed. The mechanisms of destruction of cementite lamellae and repeated precipitation of carbide-phase nanoparticles are considered.

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长期运行后特种钢轨头部的结构相状态

采用透射电子显微镜方法分析了 E90KhAF 钢制造的 DT400IK 异种淬火特种长钢轨在现场试验中通过 1.87 亿吨的吨位后，其轨头沿表面圆角半径以及距圆角半径 2 毫米和 10 毫米处的结构、相组成和位错亚结构的变化情况。弯曲消亡等值线的形成表明轨头在长期运行后处于弹性应力状态。揭示了晶格曲率扭转的来源。考虑了水泥土薄片破坏和碳化物相纳米颗粒反复沉淀的机制。

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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.