Effect of Annealing Time on Microstructure Stability and Mechanical Behavior of Ferrite-Cementite Steel with Multiscale Lamellar Structure

Zhang, Dongmei; Zhang, Minghe; Cao, Kuo; Ning, Jiangli; Feng, Yunli

doi:10.1007/s11663-021-02075-z

Cited by 8 publications

(7 citation statements)

References 36 publications

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“…Assuming that all strengthening mechanisms above are independent and linearly additive the yield strength could be calculated by a summation of all strengthening contributors. Such an approach gives a good correspondence between the calculated and experimental yield strengths for various annealed/recrystallized steels and alloys [5,10,30,38]. It is clear from Table 3, however, that this simple summation of all strengthening contributions results in significant (by about 1.5 times) overestimation of the yield strength.…”

Section: Discussionmentioning

confidence: 77%

“…In contrast to the impact toughness, however, the strengthening effect of tempforming has not been studied in detail. There are only a limited number of studies addressing the strengthening mechanisms in hypoeutectoid and eutectoid steels with lamellar microstructures produced by cold to hot rolling/drawing [9,10]. The grain size and dislocation strengthening were considered as major contributors to the strength of medium carbon steels with lamellar microstructure [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Strengthening Mechanisms in an HSLA Steel Subjected to Tempforming

Dolzhenko

Pydrin

Gaidar

et al. 2021

Metals

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An effect of tempforming on the microstructure, the carbide precipitation, and the strengthening mechanisms of high-strength low-alloyed steel has been analyzed. The quenched steel was subjected to 1 h tempering at a temperature of 873 K, 923 K, or 973 K followed by plate rolling at the same temperature. Tempforming resulted in the formation of an ultrafine grained lamellar-type microstructure with finely dispersed carbides of (Nb,V)C, Fe3C and Cr23C6. A decrease in tempforming temperature resulted in a reduction of the transverse grain size from 950 nm to 350 nm. Correspondingly, the size of Fe3C/Cr23C6 particles decreased from 90 nm to 40 nm while the size of (Nb,V)C particles decreased from 17 nm to 4 nm. Refining the tempformed microstructure with a decrease in thetempforming temperature provided an increase in the yield strength from 690 MPa to 1230 MPa.

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Section: Discussionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Microstructure and Strengthening Mechanisms in an HSLA Steel Subjected to Tempforming

Dolzhenko

Pydrin

Gaidar

et al. 2021

Metals

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“…Different strengthening mechanisms could be operative in low-alloy steels [5,8,9,16,17]. It is well-known that all strengthening mechanisms give additive contributions, and overall YS can be expressed as…”

Section: Discussionmentioning

confidence: 99%

“…However, the strengthening mechanisms responsible for the YS increment after tempforming have not been studied in detail. D. Zhang et al [8] suggested that grain boundary strengthening gives the largest contribution to the overall YS of a warm-rolled pearlitic steel plate. X. Zhang et al [9] reported that the boundary strengthening attributed to small spacing between cementite lamellae and the dislocation strengthening associated with high dislocation density evolved during cold drawing were the major contributors to the strength of an eutectoid composition steel.…”

Section: Introductionmentioning

confidence: 99%

Strengthening Mechanisms in a Medium-Carbon Steel Subjected to Thermo-Mechanical Processing

Dudko,

Yuzbekova,

Kaibyshev

2023

Applied Sciences

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Strengthening mechanisms were examined in a Fe-0.43C-1.60Si-0.01Mn-1.1Cr-0.95Mo-0.08V-0.05Nb steel exhibiting a yield strength (YS) of 1310 MPa after tempering and 1550 MPa after tempforming. The dislocation strengthening gave a major contribution to the overall YS of the steel in the tempered condition, whereas dispersion strengthening was a major contributor to the YS of the steel in the tempformed condition. High values of dislocation strengthening after tempering were attributed to dislocations composing the lath boundaries. A high density of free dislocations provided nearly the same dislocation strengthening after tempforming. Warm rolling after tempering led to alignment of intercrystallite boundaries along the rolling direction that decreased the interparticle spacing between M23C6 carbides located at these boundaries and thus increased the magnitude of dispersion strengthening. The boundary strengthening contributed to overall YS significantly due to small lath thickness after tempering and nanoscale spacing between lamellar boundaries after tempforming.

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“…When the cooling rate increased, the starting time and duration of ferrite transformation in the steel shortened, resulting in an increase in the hardness of 20CrMnTi steel. Zhang, B. et al [13] studied the relationship between temperature and deformation resistance of 20CrMnTi steel during deformation in a two-phase region with an isothermal compression experiment, and analyzed the microstructure of the deformation region. Lv, L. et al [14] studied the microstructure of a closed extruding fine blanking spur gear and found that the metal streamline near the extrusion shear surface is relatively dense, the gear material in the deformation area produced large plastic deformation, and the material mainly flows along the axial direction.…”

Section: Introductionmentioning

confidence: 99%

Study on the Work Hardening and Metamorphic Layer Characteristics of Milling Contour Bevel Gears

Zhang

et al. 2022

Materials

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High temperature and strain will occur in the cutting area during dry milling of contour bevel gears, which causes plastic deformation of the workpiece, resulting in changes in the physical properties of the machined surface’s metamorphic layer, reducing the quality of the workpiece’s machined surface. Therefore, it is necessary to investigate the properties of the metamorphic layer and the work hardening behavior of the machined surfaces of contour bevel gears. The paper first establishes a single-tooth finite element simulation model for a contour bevel gear and extracts the temperature field, strain field and strain rate at different depths from the machined surface. Then, based on the simulation results, the experiment of milling contour bevel gears is carried out, the microscopic properties of the machined metamorphic layer are studied using XRD diffractometer and ultra-deep field microscopy, and the work hardening behavior of the machined metamorphic layer under different cutting parameters is studied. Finally, the influence of the cutting parameters on the thickness of the metamorphic layer of the machined surface is investigated by scanning electron microscopy. The research results can not only improve the surface quality and machinability of the workpiece, but are also significant for increasing the fatigue strength of the workpiece.

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Effect of Annealing Time on Microstructure Stability and Mechanical Behavior of Ferrite-Cementite Steel with Multiscale Lamellar Structure

Cited by 8 publications

References 36 publications

Microstructure and Strengthening Mechanisms in an HSLA Steel Subjected to Tempforming

Microstructure and Strengthening Mechanisms in an HSLA Steel Subjected to Tempforming

Strengthening Mechanisms in a Medium-Carbon Steel Subjected to Thermo-Mechanical Processing

Study on the Work Hardening and Metamorphic Layer Characteristics of Milling Contour Bevel Gears

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