Structure, phase composition, and defect substructure of differentially quenched rail

Abstract

Differential quenching of rail by compressed air is a promising hardening method. Transmission electron microscopy is used for layer-by-layer analysis of differentially quenched rail. Quantitative parameters of the structure, phase composition, and dislocational substructure are determined and compared for different quenching conditions. Differential quenching of rail by compressed air in different conditions is accompanied by diffusional γ → α transformation. Three morphologically distinct components are formed: grains of plate pearlite, structure-free ferrite, and ferrite-carbide mixture. Gradient behavior is noted in the resulting structure: the state of the surface layer in the rail steel depends not only on the quenching conditions but also on the direction of observation and the depth of the layer being analyzed. Dislocational substructure is obtained; not only dislocational chaos, but also reticular, cellular, and fragmented dislocational substructure.

Original language	English
Pages (from-to)	883-885
Number of pages	3
Journal	Steel in Translation
Volume	44
Issue number	12
DOIs	https://doi.org/10.3103/S0967091214120067
Publication status	Published - 1 Jan 2014

Keywords

dislocational substructure
phase composition
quenching
steel rail

ASJC Scopus subject areas

Materials Science(all)

Access to Document

10.3103/S0967091214120067

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title = "Structure, phase composition, and defect substructure of differentially quenched rail",

abstract = "Differential quenching of rail by compressed air is a promising hardening method. Transmission electron microscopy is used for layer-by-layer analysis of differentially quenched rail. Quantitative parameters of the structure, phase composition, and dislocational substructure are determined and compared for different quenching conditions. Differential quenching of rail by compressed air in different conditions is accompanied by diffusional γ → α transformation. Three morphologically distinct components are formed: grains of plate pearlite, structure-free ferrite, and ferrite-carbide mixture. Gradient behavior is noted in the resulting structure: the state of the surface layer in the rail steel depends not only on the quenching conditions but also on the direction of observation and the depth of the layer being analyzed. Dislocational substructure is obtained; not only dislocational chaos, but also reticular, cellular, and fragmented dislocational substructure.",

keywords = "dislocational substructure, phase composition, quenching, steel rail",

author = "Gromov, {V. E.} and Yur{\textquoteright}ev, {A. B.} and Morozov, {K. V.} and Ivanov, {Yu F.} and Alsaraeva, {K. V.}",

year = "2014",

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language = "English",

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journal = "Steel in Translation",

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TY - JOUR

T1 - Structure, phase composition, and defect substructure of differentially quenched rail

AU - Gromov, V. E.

AU - Yur’ev, A. B.

AU - Morozov, K. V.

AU - Ivanov, Yu F.

AU - Alsaraeva, K. V.

PY - 2014/1/1

Y1 - 2014/1/1

N2 - Differential quenching of rail by compressed air is a promising hardening method. Transmission electron microscopy is used for layer-by-layer analysis of differentially quenched rail. Quantitative parameters of the structure, phase composition, and dislocational substructure are determined and compared for different quenching conditions. Differential quenching of rail by compressed air in different conditions is accompanied by diffusional γ → α transformation. Three morphologically distinct components are formed: grains of plate pearlite, structure-free ferrite, and ferrite-carbide mixture. Gradient behavior is noted in the resulting structure: the state of the surface layer in the rail steel depends not only on the quenching conditions but also on the direction of observation and the depth of the layer being analyzed. Dislocational substructure is obtained; not only dislocational chaos, but also reticular, cellular, and fragmented dislocational substructure.

AB - Differential quenching of rail by compressed air is a promising hardening method. Transmission electron microscopy is used for layer-by-layer analysis of differentially quenched rail. Quantitative parameters of the structure, phase composition, and dislocational substructure are determined and compared for different quenching conditions. Differential quenching of rail by compressed air in different conditions is accompanied by diffusional γ → α transformation. Three morphologically distinct components are formed: grains of plate pearlite, structure-free ferrite, and ferrite-carbide mixture. Gradient behavior is noted in the resulting structure: the state of the surface layer in the rail steel depends not only on the quenching conditions but also on the direction of observation and the depth of the layer being analyzed. Dislocational substructure is obtained; not only dislocational chaos, but also reticular, cellular, and fragmented dislocational substructure.

KW - dislocational substructure

KW - phase composition

KW - quenching

KW - steel rail

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