Novel Method for Refining Coarse Eutectic Carbides in Ultrahigh-Carbon Steel

Liu, Qingsuo; Wang, Fang; Zhang, Xin; Wang, Huibin; Li, Jinman

doi:10.1007/s11041-020-00458-8

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…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%

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: Introductionmentioning

confidence: 99%

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

Duan

Lü

et al. 2019

steel research int.

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“…The phase precipitation behavior of HR3C heat-resistant steel during service has attracted the attention of scholars. At present, a large number of research results indicate that the types of precipitates in HR3C style steel during aging or service are mainly NbCrN (Z phase) [5,6], M 23 C 6 [7][8][9] and Nb (C, N) [6,10], Cr3Ni2SiC [7] and σ phase [5,[11][12][13][14]. However, the existence of σ phase precipitating in HR3C heat-resistant steel during high temperature exposing is controversial [5,15].…”

Section: Introductionmentioning

confidence: 99%

Precipitation Behavior of σ Phase in Ultra-Supercritical Boiler Applied HR3C Heat-Resistant Steel

Cao

Cheng

Zhao

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The precipitation kinetics of σ phase in commercial HR3C heat-resistant steel during aging at 650-800 °C was studied in the paper. Through morphology, composition and structural analyzing on the second phase in the HR3C steel, it was confirmed that the precipitations after aging were mainly NbCrN, M 23 C 6 and FeCr type σ phase. The time-dependent mass change of the three precipitated phases showed that the linearly increased σ phase after aging at 750 °C-2000 h was transformed from NbCrN phase or M 23 C 6 phase. According to the calculation on the volume fraction of electrolytically dyed σ phase, the time-temperature transformation (TTT) curve for σ phase at 1 vol% in two kinds of commercial HR3C steel (different in grain size) was obtained and analyzed. The nose of the TTT curve was located at around 750 °C for the two kinds of HR3C steel, and the larger grain size HR3C steel displayed a inhibit effect on the precipitation of σ phase. The impact energy of the HR3C steel after aging at 700 °C decreased obviously with the fracture mechanism changing from ductile fracture to intergranular brittle fracture, which was considered to be related to the density of σ-brittle phase after aging.

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Novel Method for Refining Coarse Eutectic Carbides in Ultrahigh-Carbon Steel

Cited by 2 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

Precipitation Behavior of σ Phase in Ultra-Supercritical Boiler Applied HR3C Heat-Resistant Steel

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