Analysis of phase transformation in Fe-C alloys using differential scanning calorimetry

Krielaart, G.P.; Brakman, C. M.; Zwaag, Sybrand van der

doi:10.1007/bf00357859

Cited by 35 publications

(11 citation statements)

References 4 publications

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“…For low heating rates, the time of the sample exposure extends and the surface of the sample may undergo decarburization. This is also noticed by other authors [20][21][22].…”

Section: Selection Of Experimental Conditionssupporting

confidence: 86%

Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel within the Heat Treatment Temperature Range

Kargul

2017

Archives of Metallurgy and Materials

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The paper presents the results of DSC analysis of steel B500SP produced in the process of continuous casting, which is intended for the production reinforcement rods with high ductility. Studies were carried out in the temperature range below 1000°C in a protective atmosphere of helium during samples heating program. The main objective of the study was to determine the temperature range of austenite structure formation during heating. As a result of performed experiments: Ac 1s , Ac 1f -temperatures of the beginning and finish of the eutectoid transformation, Ac 2 -Curie temperature of the ferrite magnetic transformation and the temperature Ac 3 of transformation of proeutectoid ferrite into austenite were elaborated. Experimental determination of phase transformations temperatures of steel B500SP has great importance for production technology of reinforcement rods, because good mechanical properties of rods are formed by the special thermal treatment in Tempcore process.

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“…For low heating rates, the time of the sample exposure extends and the surface of the sample may undergo decarburization. This is also noticed by other authors [20][21][22].…”

Section: Selection Of Experimental Conditionssupporting

confidence: 86%

Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel within the Heat Treatment Temperature Range

Kargul

2017

Archives of Metallurgy and Materials

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“…Krielaart et al [33], for example, have used DSC to study the enthalpy effects associated with the γ → pearlite, and γ → α-ferrite + pearlite transformations during cooling of low-carbon eutectoid and hypo-eutectoid steels from single-phase austenite.…”

Section: Discussionmentioning

confidence: 99%

“…Although there have been many instances of application of thermal analysis methods for the study of tempering kinetics and phase transformation energetics in steels and in other iron-based alloys [32][33][34][35][36][37][38][39], there are not many studies devoted to incorporating the effect of microstructural changes on the thermodynamic properties of ferritic steels. Krielaart et al [33], for example, have used DSC to study the enthalpy effects associated with the γ → pearlite, and γ → α-ferrite + pearlite transformations during cooling of low-carbon eutectoid and hypo-eutectoid steels from single-phase austenite.…”

Section: Discussionmentioning

confidence: 99%

A Study on the Effect of Thermal Ageing on the Specific-Heat Characteristics of 9Cr–1Mo–0.1C (mass%) Steel

et al. 2009

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The effect of thermal ageing on the heat-capacity behavior of 9Cr-1Mo-0.1C (mass%) ferritic/martensitic steel has been studied using differential scanning calorimetry (DSC) in the temperature range from 473 K to 1,273 K. The DSC results in the case of slow cooled, normalized and tempered, and subsequently thermally aged samples (500 h to 5,000 h at 823 K (550 • C) and 923 K (650 • C), clearly marked the presence of both magnetic and α-ferrite + carbide → γ -austenite phase transformations that take place successively upon heating. Furthermore, for the case of fully martensitic microstructure, an additional exothermic transformation at about 920 K (647 • C), arising from carbide precipitation is noticed. This event is characterized by a sharp drop in C P . It is found that the α-ferrite + carbide → γ -austenite phase transformation temperature is only mildly sensitive to microstructural details, but the enthalpy change associated with this phase transformation, and especially the change in specific heat around the transformation regime, are found to be dependent on the starting microstructure generated by thermal ageing treatment. Prolonged ageing for about 500 h to 5,000 h in the temperature range from 823 K to 923 K (550 • C to 650 • C) contributed to a decrease in heat capacity, as compared to the normalized and tempered sample. This is due to the increase in carbide volume fraction. The martensitic microstructure is found to possess the lowest room-temperature C P among different microstructures.

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“…Since the heat capacities of both ferrite and austenite do not depend on the carbon content, [40] in the present model, the following linear equation was employed to fit the published experimental data: [30,40] ⌬H i ϭ 282 Ϫ 0.3 T The finite-element model is composed here of two parts. The first is the mechanical component, based on the rigidas follows:…”

Section: Analysis Of Heat Effectmentioning

confidence: 99%

An integrated computer model with applications for austenite-to-ferrite transformation during hot deformation of Nb-microalloyed steels

Majta

Pietrzyk

Zurek

et al. 2002

Metall Mater Trans A

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MARK COLA, PAT HOCHANADEL, and MACIEJ PIETRZYK This work presents an austenite decomposition model, based on the thermodynamics of the system and diffusion-controlled nucleation theory, to predict the evolution of microstructure during hot working of niobium-microalloyed steels. The differences in microstructural development of hotdeformed microalloyed steel in the single-phase austenite and two-phase (austenite ϩ ferrite) regions have been effectively described using an integrated computer modeling process. The complete model presented here takes into account the kinetics of recrystallization, recrystallized austenite grain size, precipitation, phase transformation, and the resulting ferrite structure. After considering existing austenite decomposition models, we decided that the method adopted in the present work relies on isothermal transformation kinetics and the principle-of-additivity rule. The thermomechanical part of the modeling process was carried out using the finite-element method. Experimental results at different temperatures, strain rates, and strain levels were obtained using a Gleeble thermomechanical simulator. A comparison of results of the model with experiments shows good agreement.

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Analysis of phase transformation in Fe-C alloys using differential scanning calorimetry

Cited by 35 publications

References 4 publications

Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel within the Heat Treatment Temperature Range

Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel within the Heat Treatment Temperature Range

A Study on the Effect of Thermal Ageing on the Specific-Heat Characteristics of 9Cr–1Mo–0.1C (mass%) Steel

An integrated computer model with applications for austenite-to-ferrite transformation during hot deformation of Nb-microalloyed steels

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