Influence of Heat Treatment and Deformation on the Phase-Structural State of Steel 30CrMnSiA

Skakov, Маzhyn; Uazyrkhanova, Gulzhaz; Попова, Н. А.; Sheffler, Michael

doi:10.4028/www.scientific.net/kem.531-532.13

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…As is seen of Figure 2 c,d and 3, ring microdiffraction patterns are observed in steels after deformation, after heat treatment there are point (Fig. 2 a,b) [7]. This means that the fragments arising during steel deformations greatly disoriented with respect to each other.…”

Section: Resultsmentioning

confidence: 65%

Electron Microscopic Analysis of 30CrMnSi Steel Surface Layers after Hot Deformation

Skakov

Uazyrkhanova

Попова

2013

AMM

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Using electron microscopy were investigated character of change microdiffraction pattern of fragmented substructure, the relationship between average size micrograins, which forming the diffraction pattern, and the point reflections number on the ring. Also the integrated degree of plastic deformation was assessed in the roll surface layers, made of steel 30CrMnSi during hot deformation. It was shown that the fragments generated during steel deformation considerably disoriented with respect to each other. Formed by heat treatment steel fragments practically is not disoriented. Found that average size of fragments to be achieved in layer at distance of 2 mm from roll surface, for anisotropic fragments amounts to 0.27×0.66 μm, for isotropic - 0.43 μm, average size of fragments - 0.44 μm. Here plastic deformation degree ε0.70. Found that in layer located at distance of 0.5 mm from roll surface, anisotropic fragments have size 0.25×0.56 μm value, for isotropic - 0.39 μm, average fragment size - 0.40 μm. Here plastic deformation degree achieved value ε0.75. It is shown that on roll surface are present only isotropic fragments with average size 0.22 μm. Corresponds to it plastic deformation degree ε0.85.

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Section: Resultsmentioning

confidence: 65%

Electron Microscopic Analysis of 30CrMnSi Steel Surface Layers after Hot Deformation

Skakov

Uazyrkhanova

Попова

2013

AMM

Self Cite

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“…Thermocouples are installed to control the temperature mode of the process to prevent the material's melting from being strengthened. Heating temperature is the main parameter of phase transformations for 18CrNi3Mo-Sh steel and is 860 °C [18]. At EPP, the bulk temperature increases to the hardening temperature of 860 °C, and the temperature of the ionized plasma overheats the surface.…”

Section: Resultsmentioning

confidence: 99%

Functional Surface Layer Strengthening and Wear Resistance Increasing of a Low Carbon Steel by Electrolytic-Plasma Processing

Kombayev¹,

Muzdybayev²,

Muzdybayeva³

et al. 2022

sv-jme

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The modified technology for strengthening the surface layer of low-carbon steel for machine components by electroplasma processing is proposed. This technology is to be used as an alternative carburizing method with subsequent hardening. The developed technology of strengthening by the proposed method is based on the author’s invention. The parameters of this process are given, resulting in a thickness of the reinforced surface layer of 1000 µm to 1700 µm. An increase in microhardness of 1.5 to 2 times (compared to the initial state) was observed. With hardening, chemical modification of the material’s surface layer occurs. The microstructure of the treated surface of the steel samples is characterised by a dark modified surface layer: a fine needle-like structure of martensitic origin under the dark layer transforms into an initial perlite-ferritic structure. The advantage of strengthening based on the electrolytic plasma processing consists of low energy consumption at high hardening speeds and the possibility of local processing of surface areas, especially large parts of complex shapes. In addition, the proposed surface treatment method using electrolytic plasma processing (EPP) not only achieves a smooth surface but also improves the service qualities of the components, specifically wear resistance.

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“…При самых различных видах и режимах пластической деформации в кристаллических материалах с различным типом кристаллической решетки наблюдается фундаментальное явление фрагментации, т.е. деформационное измельчение структуры до 100-200 нм [7,8].…”

Section: Introductionunclassified

Evolution of the Lamellar Pearlite Structure of Rail Steel under Tension

Aksenova¹,

Громов²,

Ivanov³

et al. 2023

Известия АлтГУ

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In this paper, the properties of rail steel subjected to fracture under uniaxial tension deformation are studied. Mechanical properties of rail steel, defective substructure of lamellar pearlite, and fracture surface of rail steel are investigated using methods of modern physical materials science. Tensile strength is found to vary from 1247 to 1335 MPa, and the fracture strain of the samples changes from 0.22 to 0.26. The deformation of the rail steel is accompanied by the process of breaking the ferrite plates into fragments by low angle boundaries along with the significant increase in the scalar dislocation density to 7.9-1010 cm-2 (the scalar dislocation density of the original rail steel is 3.2 -1010 cm-2). Also, there is a formation of internal stress fields appearing in the form of bend extinction contours. The sources of stress fields are identified. It is revealed that cementite plates are fractured by cutting and dissolution with subsequent transfer of carbon to ferrite plates by moving dislocations and formation of round-shaped nanodimensional (8.3 nm) round shaped particles of tertiary cementite. It is shown that the dissolution of cementite plates is accompanied by fragmentation (into coherent scattering regions with an average size of 9.3 nm).

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Influence of Heat Treatment and Deformation on the Phase-Structural State of Steel 30CrMnSiA

Cited by 7 publications

References 6 publications

Electron Microscopic Analysis of 30CrMnSi Steel Surface Layers after Hot Deformation

Electron Microscopic Analysis of 30CrMnSi Steel Surface Layers after Hot Deformation

Functional Surface Layer Strengthening and Wear Resistance Increasing of a Low Carbon Steel by Electrolytic-Plasma Processing

Evolution of the Lamellar Pearlite Structure of Rail Steel under Tension

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