Effects of Si and Cr on Complete Decarburization Behavior of High Carbon Steels in Atmosphere of 2 vol. % O2

Liu, Y.B.; Zhang, Wei; Tong, Qian; Sun, Qisong

doi:10.1016/s1006-706x(16)30194-7

Cited by 25 publications

(10 citation statements)

References 14 publications

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“…It is also investigated by Choi and van der Zwaag, and they speculate that the complete decarburization thickness may be proportional to the value of (C γ –C α ) in this temperature region . In addition, Liu et al report that higher the value of C α , the higher the probability of forming a complete decarburization layer, which further corroborate the aforementioned viewpoints …”

Section: Resultssupporting

confidence: 55%

“…In the more recent studies, abundant effort has been made to research the effect of various factors on the surface decarburization kinetics and establish the related mathematical models, in which the alloy composition, decarburized atmosphere, surface morphology, austenite–ferrite transformation, isothermal temperature, holding time, cooling rate, the mutual interaction between oxidation and decarburization, and so on, is taken into account. Previous study showed that the decarburized temperature plays a more critical role in the decarburization rate, as compared with other influencing factors because the decarburization is a thermally activated process and has a high‐temperature sensitivity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Temperature Dependence and Formation Mechanism of Surface Decarburization Behavior in 35CrMo Steel

Duan

Lü

et al. 2019

steel research int.

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Herein, the temperature dependence and formation mechanism of surface decarburization behavior are researched for 35CrMo steel in the temperature range of 710–950 °C. In view of the three transformation temperatures A1, A3, and TG (the A3 temperature for pure iron), the decarburized microstructural characteristics can be divided into four types: nondecarburization, complete decarburization, complete and partial decarburizations, and partial decarburization. The absolute thickness of the total decarburization layer is the sum of the thicknesses of oxide layer, complete decarburization layer, and partial decarburization layer, and it follows an exponential relationship with the temperature. The absolute thickness of complete decarburization layer, including the thicknesses of the oxide layer and the visible complete decarburization layer, decreases with increasing temperature. In the temperature range of A1–A3, the complete decarburization rate is primarily controlled by the austenitization degree and the diffusivity of carbon in ferrite and austenite, whereas in the temperature range of A3–TG, it can be jointly controlled by the decarburized incubation time in single‐phase austenite and the duration holding in the α + γ phase field.

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Section: Resultssupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Temperature Dependence and Formation Mechanism of Surface Decarburization Behavior in 35CrMo Steel

Duan

Lü

et al. 2019

steel research int.

View full text Add to dashboard Cite

show abstract

“…The axial and shear stress can be obtained via the stress-strain relations expressed as Equation (5), where the elasticity modulus E(z) varies across the beam height according to Equations ( 1) and ( 2), and shear modulus G(z) is calculated according to Equation (6).…”

Section: Methodsmentioning

confidence: 99%

“…With increasing duration time in high temperature, oxygen and hydrogen diffuse to the deeper layer, and the carbon atoms migrate to the surface layer continuously. Thus, the depth of the decarburization increases with the duration of exposure in high temperature atmosphere with oxygen and hydrogen, and the degree of decarburization increases from the deep layer to the top surface [5]. As is illustrated in Figure 2, in the surface-adjacent area, a complete decarburization zone with almost total removal of carbon appears, and the partial decarburization zone in the deeper area is produced, where partial carbon is removed.…”

Section: Introductionmentioning

confidence: 92%

Influence of Graded Surface Decarburization of Automobile Forging Front Axle on the Bending Behavior Based on a Third-Order Shear Deformation Beam Theory

Hua

et al. 2022

Machines

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During the forging process of automobile front axle, the steel near the surface is often decarburized for a certain depth. The mechanical properties at the decarburization layer are graded and different from the inner area, influencing the bending behavior of axles under heavy loads. In this paper, the decarburized forging of front axle is regarded as a rectangular thick sandwich beam, composed of a homogeneous core and the functionally graded layer coated on both bottom and top surface. A Third-order Shear Deformation Theory (TSDT) is employed to investigate the static bending behaviors under two point−loads. The properties of sandwich FG material are represented with a piecewise power−law function, and the displacement field governing equations are derived through the virtual work principle. The Navier analytical method and numerical DQM procedures are employed to obtain the bending responses under simply supported boundary conditions, and the results are validated through the comparison with an example in the literature. Then, the transverse deflection, rotation, axial stress, and shear stress are studied in terms of different power−law exponents, decarburization depth, unsymmetrical decarburization depth, unbalance loading, and beam sectional dimension. The study reveals the influence of surface decarburization on the bending behavior of forged automobile front axles, and contributes to the optimization of structure design.

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“…The average carbon content after decarburization is an important criterion in judging the feasibility of the solidstate steelmaking process. There have been many studies on the gas-solid decarburization of iron sheets [9][10][11][12][13][14]. However, in these studies [15][16][17][18][19], the carbon contents of iron sheets were usually less than 1.0 mass%, and they mainly focused on phase transformation from austenite to ferrite phase by decarburization reaction.…”

Section: Introductionmentioning

confidence: 99%

Average carbon content change during gas-solid decarburization of 2 mm iron sheet with a high carbon content

Cheng

Hong

et al. 2020

Metall. Res. Technol.

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The average carbon content after decarburization is an important criterion in judging the feasibility of the solid-state steelmaking process. To investigate the change mechanism of the average carbon content, the gas-solid decarburization of 2 mm iron sheet in weak oxidizing atmosphere (Ar + H2 + H2O) at 1293, 1353, and 1413 K is studied. The influences of decarburization time and temperature are considered. Increasing both the temperature and time can enhance decarburization. The gas-solid decarburization reaction of 2 mm iron sheets is nearly a first-order reaction, and the activation energy of the decarburization reaction is 144.9 kJ/mol. It was found that the diffusion of carbon from the interior of the sheet to the reaction interface is the rate-controlling step. The relationship between decarburization time, temperature, and average carbon content is precisely described by an empirical formula. A new segmented heating method is developed. With this new method, 0.28 mass% C sheets can be produced from 4.15 mass% C sheets with thickness of 2 mm in 70 min.

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Effects of Si and Cr on Complete Decarburization Behavior of High Carbon Steels in Atmosphere of 2 vol. % O2

Cited by 25 publications

References 14 publications

Temperature Dependence and Formation Mechanism of Surface Decarburization Behavior in 35CrMo Steel

Temperature Dependence and Formation Mechanism of Surface Decarburization Behavior in 35CrMo Steel

Influence of Graded Surface Decarburization of Automobile Forging Front Axle on the Bending Behavior Based on a Third-Order Shear Deformation Beam Theory

Average carbon content change during gas-solid decarburization of 2 mm iron sheet with a high carbon content

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