Structure and Properties of Lengthy Rails after Extreme Long-Term Operation

Yuriev, A. A.; Gromov, V.E.; Ivanov, Yu. F.; Rubannikova, Yu. A.; Старостенков, М. Д.; Tabakov, Pavel Y.

doi:10.21741/9781644901472

Cited by 35 publications

(24 citation statements)

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“…TEM analysis of weld structure enabled us to perform the studies of internal stress fields which manifest themselves as bend extinction contours [10,12] (Fig. 4).…”

Section: Resultsmentioning

confidence: 99%

“…On the basis of electron microscope studies of welds the quantitative analysis of steel structure characteristics is presented in the Table 2. Scalar (<U>) and excess (Ur) dislocation densities as well as volume fraction of cementite (Fe 3 C) were determined; according to the known relationships [12] the estimate of metal strengthening due to presence of dislocation substructure and internal stress fields was done.…”

Section: Resultsmentioning

confidence: 99%

“…1. Metal strengthening, being introduced by dislocation substructure, was estimated in the research on the basis on known relation [12]: where V 0 is flow stress of nondislocation origin (i.e. caused by other mechanisms of strengthening); D is parameter characterizing the value of interdislocation interactions; m is Smidt orientation factor, G is rigidity modulus of steel; b -Burgers vector of dislocation.…”

Section: Resultsmentioning

confidence: 99%

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Structure, defect substructure and fracture surface of low-carbon alloy steel welds

Kozyrev¹,

Kryukov²,

Gromov³

et al. 2022

cisisr

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By the methods of scanning and transmission electron microscopy a structural phase state, defect substructure and fracture surface of low carbon alloy steel welds produced with use of carbon-containing addition and without it are investigated. The study of etched metallographic section structure of welds revealed a presence of a large amount of second phase particles (carbides, sulfides, oxides, etc.). It is shown that in weld with a carbon-containing addition the particles locate chaotically, and in weld without addition they decorate boundaries of ferrite grains. Dimensions of second phase particles vary in the limits from 0.8 μm to 5 μm and are identical for both types of welds. Analysis of fracture surface structure of welds is carried out. A presence of nonmetallic inclusions is detected. They are typical of mainly weld produced without a carbon-containing addition which may indicate its increased brittleness. Amount of micropores in fracture of weld with carbon-containing addition is many times greater than that in weld without addition, which is indicative of gas removal in use of carbon-containing addition. The quantitative analysis of structure and dislocation substructure parameters of weld metal is carried out, the estimates of contributions of scalar and excess dislocation density to strength of welds are performed. It is shown that higher values of scalar and excess dislocation density in the weld formed without carbon-containing addition in flux may be responsible for material embrittlement. A large quantity of stress concentrators in the weld without carbon-containing addition may result in material embrittlement.

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“…TEM analysis of weld structure enabled us to perform the studies of internal stress fields which manifest themselves as bend extinction contours [10,12] (Fig. 4).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Structure, defect substructure and fracture surface of low-carbon alloy steel welds

Kozyrev¹,

Kryukov²,

Gromov³

et al. 2022

cisisr

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show abstract

“…DOI 10.25205/978-5-4437-1353-3-51 ПРЕОБРАЗОВАНИЕ СТРУКТУРЫ ПЛАСТИНЧАТОГО ПЕРЛИТА ПРИ ДЕФОРМАЦИИ РАСТЯЖЕНИЕМ РЕЛЬСОВОЙ СТАЛИ 1 Аксёнова К.В., 1 Громов В.Е., 2 Иванов Ю.Ф., 3 Ващук Е.С. 1 Сибирский государственный индустриальный университет, Новокузнецк 2 Институт сильноточной электроники СО РАН, Томск 3 Филиал Кузбасского государственного технического университета имени Т.Ф. Горбачева, Прокопьевск…”

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“…Значительное увеличение интенсивности железнодорожного транспорта и его грузонапряженности в последние годы требует высокой эксплуатационной стойкости рельсов, изготавливаемых из перлитной стали. В исходном состоянии рельсы содержат около 70% перлита пластинчатой морфологии, деформация которого сопровождается сложной трансформацией феррита и цементита [1], обычно наблюдаемой методами просвечивающей электронной микроскопии. Основное внимание при этом уделяется деформационно индуцированному разрушению цементита [2,3], приводящему к росту концентрации углерода в феррите и дополнительному механизму упрочнения.…”

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