Internal Stresses and their Sources in BCC and FCC Steels

Конева, Н. А.; Попова, Н. А.; Никоненко, Е. Л.

doi:10.4028/www.scientific.net/ssp.303.128

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…In this case, the amplitude of shear stresses (internal stresses created by the dislocation structure) is σ L = 420 MPa. Comparing the obtained values with the initial state of the steel, it can be seen that the action of the electron beam led to a certain increase in internal stresses in α -martensite and, nevertheless remains σ L > σ ∂ , which means that the bending-torsion of α -martensite crystal lattice before and after impact by an electron beam has plastic character as in the initial state [34]. Table 1.…”

Section: Structure and Phase Composition After Irradiationmentioning

confidence: 86%

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Impact of Electronic Radiation on the Morphology of the Fine Structure of the Surface Layer of R6M5 Steel

et al. 2021

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In recent decades, great efforts have been made to significantly improve the performance characteristics of high-speed steel using various surface hardening techniques. Electron beam modification is engaging because it has an exceptionally high thermal efficiency and can significantly improve steels’ physical and mechanical properties. This work is devoted to researching the fine structure and changing the structural phase state of the surface layer of R6M5 high-speed steel after exposure to an electron beam. Electron beam treatment of steel R6M5 was carried out on a vacuum installation. The structure and phase composition of P6M5 steel samples were studied by transmission electron microscopy. Determined that after electron irradiation, the steel structure as in the initial state consists of martensite, carbides and residual austenite. After electron irradiation, an increase in the volume fraction of lamellar martensite is observed: the fraction of lamellar martensite in the initial state is 80%, and after irradiation, it is ~90% of the total fraction of α′-martensite. The action of the electron beam led to an increase in internal stresses in α′-martensite. Revealed, the value of the scalar dislocation density in R6M5 steel after exposure to an electron beam is higher than in the initial state. A cardinal difference in the state of the material after exposure to an electron beam is the presence of bending extinction contours in all M6C carbide particles.

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Section: Structure and Phase Composition After Irradiationmentioning

confidence: 86%

“…As can be seen from the microphotographs presented in Figure 3, the M 6 C carbide particles contain neither dislocations nor bending extinction contours. This means that there are no internal stresses in the particles [34].…”

Section: Structure and Phase Composition After Irradiationmentioning

confidence: 99%

Impact of Electronic Radiation on the Morphology of the Fine Structure of the Surface Layer of R6M5 Steel

et al. 2021

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Development of shear deformation in lath martensite of medium alloy steels under tension

Teplyakova

Kashin

Kunitsyna

2023

Izv. vysš. učebn. zaved., Čern. metall.

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Evolution of shear deformation in steel with the structure of tempered martensite was studied under active tension. Purpose of the work was to identify the patterns of deformation development at the scale-structural levels: package, plate, fragment of a package and a lath. The authors investigated the deformation relief formed at different stages of plastic deformation by optical, transmission and scanning electron microscopy. Quantitative characteristics of the deformation relief were measured: shear strength (P), distance (X) between the shear traces and their length. Statistical processing was carried out, the average values and relationship with the degree of plastic deformation were determined. It was established that development of shear deformation in the lath component of martensite occurs with the formation of two subsystems of shear traces: thin and coarse. Subsystems of thin traces are formed from the very beginning of plastic deformation. Appearance and evolution of the subsystem of coarse traces correlates with formation of the first (long) neck in the sample, and it is the main mechanism leading to the localization of plastic deformation on the sample scale. The places of localization of rough shift are the border areas of the laths and fragments of the package. Connection between localization of subsystems of coarse shear traces and formation of a fragmented dislocation structure were revealed. The values of the average shear power in thin <Pf> and coarse <Ps> traces do not depend on the degree of local plastic deformation of the sample in the entire range of deformation degrees and remain constant until destruction (<Pf> = 0.1 μm and <Ps> = 0.3 μm).

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Internal Stresses and their Sources in BCC and FCC Steels

Cited by 2 publications

References 18 publications

Impact of Electronic Radiation on the Morphology of the Fine Structure of the Surface Layer of R6M5 Steel

Impact of Electronic Radiation on the Morphology of the Fine Structure of the Surface Layer of R6M5 Steel

Development of shear deformation in lath martensite of medium alloy steels under tension

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