The influence of chromium on the pearlite-austenite transformation kinetics of the Fe–Cr–C ternary steels

Kong, Lingnan; Liu, Yaohui; Liu, Jia-An; Song, Yulai; Li, Shasha; Zhang, Renhang; Li, Tuanjie; Liu, Yan

doi:10.1016/j.jallcom.2015.06.259

Cited by 27 publications

(14 citation statements)

References 31 publications

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“…The austenitic sizes decrease with a concentration increase of Mo. The results confirm earlier experiments in which the austenite grain size was refined by adding the alloying elements into steels [24]. Moreover, there are carbides (red circles) at the grain boundaries, and the number increases with an increase in Mo concentration.…”

Section: Microstructure Analysissupporting

confidence: 87%

“…Based on classical nucleation theory, there are fluctuations in energy, microstructure and composition at the interfaces between ferrite and cementite, which causes the nucleation of austenite produces preferentially at the interface [24]. Because of austenite transformation can be classified as the site saturation model, the nucleation rate, ∘ N , can be described as [12] …”

Section: Kineticsmentioning

confidence: 99%

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Kinetics of the austenitization in the Fe-Mo-C ternary alloys during continuous heating

Kong

Liu

et al. 2016

Open Physics

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Abstract:The influence of molybdenum on the microstructure and kinetics of the austenization of the Fe-Mo-C ternary alloys is analyzed using differential scanning calorimetry (DSC) and the Johnson-Mehl-AvramiKolmogorov model (JMAK) in the temperature range from 293 K to 1373 K. The as-cast microstructure and microstructure after DSC test are obtained using optical microscopy (OM) and scanning electron microscopy (SEM). It was seen that with an increasing Mo concentration, the lamellar pearlite is spherized and the austenite grain size decreases. In addition, both DSC curves and the JMAK model show that the initial (Ac1) and the final (Ac3) temperature of the phase transition increases with an increasing Mo concentration. It was also seen that increasing the Mo concentration, the diffusion activation energy (DAE) increases and the pre-exponential factor of diffusion (DPEF) decreases due to a change in both the austenitic nucleation rate and the diffusion of the elements caused by the introduction of Mo.

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Section: Microstructure Analysissupporting

confidence: 87%

Section: Kineticsmentioning

confidence: 99%

Kinetics of the austenitization in the Fe-Mo-C ternary alloys during continuous heating

Kong

Liu

et al. 2016

Open Physics

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“…The kinetics of carbide dissolution during austenitization has been thoroughly studied under isothermal conditions [1][2][3][4][5][6][7][8][9]. The formation of austenite is a structure sensitive process; therefore, the initial microstructure plays a crucial role in the formed austenite.…”

Section: Introductionmentioning

confidence: 99%

Study of Carbide Dissolution and Austenite Formation during Ultra-Fast Heating in Medium Carbon Chromium Molybdenum Steel

Papaefthymiou

Bouzouni

Petrov

2018

Metals

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Abstract:In this study, UltraFast Heat Treatment (UFHT) was applied to a soft annealed medium carbon chromium molybdenum steel. The specimens were rapidly heated and subsequently quenched in a dilatometer. The resulting microstructure consists of chromium-enriched cementite and chromium carbides (in sizes between 5-500 nm) within fine (nano-sized) martensitic and bainitic laths. The dissolution of carbides in austenite (γ) during ferrite to austenite phase transformation in conditions of rapid heating were simulated with DICTRA. The results indicate that fine (5 nm) and coarse (200 nm) carbides dissolve only partially, even at peak (austenitization) temperature. Alloying elements, especially chromium (Cr), segregate at austenite/carbide interfaces, retarding the dissolution of carbides and subsequently austenite formation. The sluggish movement of the austenite/carbide interface towards austenite during carbide dissolution was attributed to the partitioning of Cr nearby the interface. Moreover, the undissolved carbides prevent austenite grain growth at peak temperature, resulting in a fine-grained microstructure. Finally, the simulation results suggest that ultrafast heating creates conditions that lead to chemical heterogeneity in austenite and may lead to an extremely refined microstructure consisting of martensite and bainite laths and partially dissolved carbides during quenching.

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“…2, a, the austenite grains are inhomogeneous by distribution, the grain boundary is curving and there is a small amount of the undissolved carbide particles at the grain boundary. Those carbide particles can influence the diffusion of iron and carbon, which can result in the hindering of the growth of austenite [11][12][13]. With the Mn concentration up to 1.36 wt%, there are carbides at the grain boundary and the pinning effect still exists.…”

Section: Microstructure Analysismentioning

confidence: 99%

The influence of manganese on kinetics of austenitization of the Fe-Mn-C ternary alloys

Kong¹,

Liu²,

Song³

et al. 2017

mech

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The influence of chromium on the pearlite-austenite transformation kinetics of the Fe–Cr–C ternary steels

Cited by 27 publications

References 31 publications

Kinetics of the austenitization in the Fe-Mo-C ternary alloys during continuous heating

Kinetics of the austenitization in the Fe-Mo-C ternary alloys during continuous heating

Study of Carbide Dissolution and Austenite Formation during Ultra-Fast Heating in Medium Carbon Chromium Molybdenum Steel

The influence of manganese on kinetics of austenitization of the Fe-Mn-C ternary alloys

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