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M. M. Aranda - One of the best experts on this subject based on the ideXlab platform.
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Pearlite Transformation in a Deformed TRIP/TWIP Austenitic Steel
Metallurgical and Materials Transactions A, 2019Co-Authors: D. Castro, Rosalia Rementeria, M. M. Aranda, J. Vivas, J. A. Jimenez, C. CapdevilaAbstract:The increasing population of defects in strained austenite not only increases the heterogeneous nucleation site density for Pearlite transformation, but also increases the austenite free energy due to the strain. This fact leads to a reduction in the critical free energy for Pearlite nucleation, which triggers Pearlite formation compared with austenite transformation without straining. Besides, a significant refinement of the Pearlite colony size due to hard impingement between neighboring colonies is achieved.
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the role of c and mn at the austenite Pearlite reaction front during non steady state Pearlite growth in a fe c mn steel
Scripta Materialia, 2015Co-Authors: M. M. Aranda, Rosalia Rementeria, Jonathan D. Poplawsky, E Uronesgarrote, C. CapdevilaAbstract:The role of C and Mn during the growth of Pearlite under non-steady state conditions is analyzed by comparing the phase compositions of austenite, ferrite and cementite (γ+α+θ) through the use of transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), and atom probe tomography (APT) measurements across the austenite/Pearlite interface. Furthermore, a local Mn enrichment and C depletion at the austenite/Pearlite interface has been measured, which causes a change in the driving force with time during divergent Pearlite growth.
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The role of C and Mn at the austenite/Pearlite reaction front during non-steady-state Pearlite growth in a Fe-C-Mn steel
Scripta Materialia, 2015Co-Authors: M. M. Aranda, Rosalia Rementeria, Jonathan D. Poplawsky, Esteban Urones-garrote, Carlos CapdevilaAbstract:The role of C and Mn during the growth of Pearlite under non-steady state conditions is analyzed by comparing the phase compositions of austenite, ferrite and cementite (γ+α+θ) through the use of transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), and atom probe tomography (APT) measurements across the austenite/Pearlite interface. Furthermore, a local Mn enrichment and C depletion at the austenite/Pearlite interface has been measured, which causes a change in the driving force with time during divergent Pearlite growth.
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Effect of Prior Austenite Grain Size on Pearlite Transformation in a Hypoeuctectoid Fe-C-Mn Steel
Metallurgical and Materials Transactions A, 2014Co-Authors: M. M. Aranda, Rosalia Rementeria, Carlos Capdevila, C. García De AndrésAbstract:The aim of this work is to evaluate the influence of the prior austenite grain size (AGS) on the austenite-to-Pearlite isothermal decomposition in a Fe-C-Mn hypoeutectoid steel. Due to the strong influence, grain boundaries have on Pearlite transformation kinetics, morphological aspects of Pearlite from two conditions with very different AGS were studied and characterized. Results allow us to conclude that the formation of Pearlite and ferrite are favored for small AGS values, whereas a larger AGS led to an increase in the total amount of Pearlite volume fraction. Furthermore, the average size of pearlitic colonies increased with increasing AGS, and it appears that the interlamellar spacing of the Pearlite does not depend on AGS, but instead, is controlled by the isothermal decomposition temperature. Finally, it was observed that the ratio between lamellar thickness of ferrite and cementite depended on AGS.
Carlos Capdevila - One of the best experts on this subject based on the ideXlab platform.
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The role of C and Mn at the austenite/Pearlite reaction front during non-steady-state Pearlite growth in a Fe-C-Mn steel
Scripta Materialia, 2015Co-Authors: M. M. Aranda, Rosalia Rementeria, Jonathan D. Poplawsky, Esteban Urones-garrote, Carlos CapdevilaAbstract:The role of C and Mn during the growth of Pearlite under non-steady state conditions is analyzed by comparing the phase compositions of austenite, ferrite and cementite (γ+α+θ) through the use of transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), and atom probe tomography (APT) measurements across the austenite/Pearlite interface. Furthermore, a local Mn enrichment and C depletion at the austenite/Pearlite interface has been measured, which causes a change in the driving force with time during divergent Pearlite growth.
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Effect of Prior Austenite Grain Size on Pearlite Transformation in a Hypoeuctectoid Fe-C-Mn Steel
Metallurgical and Materials Transactions A, 2014Co-Authors: M. M. Aranda, Rosalia Rementeria, Carlos Capdevila, C. García De AndrésAbstract:The aim of this work is to evaluate the influence of the prior austenite grain size (AGS) on the austenite-to-Pearlite isothermal decomposition in a Fe-C-Mn hypoeutectoid steel. Due to the strong influence, grain boundaries have on Pearlite transformation kinetics, morphological aspects of Pearlite from two conditions with very different AGS were studied and characterized. Results allow us to conclude that the formation of Pearlite and ferrite are favored for small AGS values, whereas a larger AGS led to an increase in the total amount of Pearlite volume fraction. Furthermore, the average size of pearlitic colonies increased with increasing AGS, and it appears that the interlamellar spacing of the Pearlite does not depend on AGS, but instead, is controlled by the isothermal decomposition temperature. Finally, it was observed that the ratio between lamellar thickness of ferrite and cementite depended on AGS.
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Neural Network Model for Isothermal Pearlite Transformation. Part I: Interlamellar Spacing
ISIJ International, 2005Co-Authors: Carlos Capdevila, Francisca García Caballero, C. García De AndrésAbstract:The present paper is the first of a two-part paper which deals with a neural network model to describe the isothermal Pearlite formation. The isothermal austenite-to-Pearlite transformation has been analyzed using a neural network technique within a Bayesian framework. In this framework, the Pearlite interlamellar spacing and growth rate of Pearlite can be represented as a general empirical function of variables such as Mn, Cr, Ni, Si and Mo alloying contents and temperature which are of great importance for the Pearlite growth mechanisms. The method has limitations owing to its empirical character, but it has been demonstrated that it can be used in such way that the predicted trends make metallurgical sense. In this first part paper, the method has been used to examine the relative importance of the alloying elements on Pearlite interlamellar spacing.
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Neural Network Model for Isothermal Pearlite Transformation. Part II: Growth Rate
ISIJ International, 2005Co-Authors: Carlos Capdevila, F. G. Caballero, C. García De AndrésAbstract:The Pearlite growth rate during the isothermal austenite-to-Pearlite transformation has been analyzed using a neural network technique within a Bayesian framework. An extensive database consisting of the detailed chemical composition considering elements such as Mn, Cr, Ni, Si and Mo, and isothermal temperature was compiled for this purpose using data from the published literature. With the aim of modeling the Pearlite growth rate during the austenite-to-Pearlite transformation a neural network has been proposed. The model allows us to examine the relative importance of the alloying elements in Pearlite growth. The results from the network analysis were consistent with those expected from phase transformation theory.
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Modelling of isothermal formation of Pearlite and subsequent reaustenitisation in eutectoid steel during continuous heating
Materials Science and Technology, 2001Co-Authors: Francisca García Caballero, Carlos Capdevila, C. García De AndrésAbstract:AbstractThree different morphologies of Pearlite have been formed isothermally at three different temperatures in a eutectoid steel. Moreover, the interlamellar spacing of the Pearlite was calculated using the Zener and Hillert theoretical method. Experimental results suggest that the growth of Pearlite is mainly controlled by volume diffusion of carbon in austenite, in the temperature range studied in this steel. In addition, a model that describes Pearlite to austenite transformation during continuous heating in a eutectoid steel has been developed. The influence of structural parameters, such as interlamellar spacing and edge length of Pearlite colonies, on the transformation kinetics has been experimentally studied and considered in the modeling. It has been found that the kinetics of Pearlite to austenite transformation are slower the coarser the initial Pearlite microstructure. Experimental validation of this model has been carried out and a good agreement (an accuracy level of higher than 90% in sq...
C. Capdevila - One of the best experts on this subject based on the ideXlab platform.
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Pearlite Transformation in a Deformed TRIP/TWIP Austenitic Steel
Metallurgical and Materials Transactions A, 2019Co-Authors: D. Castro, Rosalia Rementeria, M. M. Aranda, J. Vivas, J. A. Jimenez, C. CapdevilaAbstract:The increasing population of defects in strained austenite not only increases the heterogeneous nucleation site density for Pearlite transformation, but also increases the austenite free energy due to the strain. This fact leads to a reduction in the critical free energy for Pearlite nucleation, which triggers Pearlite formation compared with austenite transformation without straining. Besides, a significant refinement of the Pearlite colony size due to hard impingement between neighboring colonies is achieved.
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the role of c and mn at the austenite Pearlite reaction front during non steady state Pearlite growth in a fe c mn steel
Scripta Materialia, 2015Co-Authors: M. M. Aranda, Rosalia Rementeria, Jonathan D. Poplawsky, E Uronesgarrote, C. CapdevilaAbstract:The role of C and Mn during the growth of Pearlite under non-steady state conditions is analyzed by comparing the phase compositions of austenite, ferrite and cementite (γ+α+θ) through the use of transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), and atom probe tomography (APT) measurements across the austenite/Pearlite interface. Furthermore, a local Mn enrichment and C depletion at the austenite/Pearlite interface has been measured, which causes a change in the driving force with time during divergent Pearlite growth.
Rosalia Rementeria - One of the best experts on this subject based on the ideXlab platform.
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Pearlite Transformation in a Deformed TRIP/TWIP Austenitic Steel
Metallurgical and Materials Transactions A, 2019Co-Authors: D. Castro, Rosalia Rementeria, M. M. Aranda, J. Vivas, J. A. Jimenez, C. CapdevilaAbstract:The increasing population of defects in strained austenite not only increases the heterogeneous nucleation site density for Pearlite transformation, but also increases the austenite free energy due to the strain. This fact leads to a reduction in the critical free energy for Pearlite nucleation, which triggers Pearlite formation compared with austenite transformation without straining. Besides, a significant refinement of the Pearlite colony size due to hard impingement between neighboring colonies is achieved.
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the role of c and mn at the austenite Pearlite reaction front during non steady state Pearlite growth in a fe c mn steel
Scripta Materialia, 2015Co-Authors: M. M. Aranda, Rosalia Rementeria, Jonathan D. Poplawsky, E Uronesgarrote, C. CapdevilaAbstract:The role of C and Mn during the growth of Pearlite under non-steady state conditions is analyzed by comparing the phase compositions of austenite, ferrite and cementite (γ+α+θ) through the use of transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), and atom probe tomography (APT) measurements across the austenite/Pearlite interface. Furthermore, a local Mn enrichment and C depletion at the austenite/Pearlite interface has been measured, which causes a change in the driving force with time during divergent Pearlite growth.
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The role of C and Mn at the austenite/Pearlite reaction front during non-steady-state Pearlite growth in a Fe-C-Mn steel
Scripta Materialia, 2015Co-Authors: M. M. Aranda, Rosalia Rementeria, Jonathan D. Poplawsky, Esteban Urones-garrote, Carlos CapdevilaAbstract:The role of C and Mn during the growth of Pearlite under non-steady state conditions is analyzed by comparing the phase compositions of austenite, ferrite and cementite (γ+α+θ) through the use of transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), and atom probe tomography (APT) measurements across the austenite/Pearlite interface. Furthermore, a local Mn enrichment and C depletion at the austenite/Pearlite interface has been measured, which causes a change in the driving force with time during divergent Pearlite growth.
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Effect of Prior Austenite Grain Size on Pearlite Transformation in a Hypoeuctectoid Fe-C-Mn Steel
Metallurgical and Materials Transactions A, 2014Co-Authors: M. M. Aranda, Rosalia Rementeria, Carlos Capdevila, C. García De AndrésAbstract:The aim of this work is to evaluate the influence of the prior austenite grain size (AGS) on the austenite-to-Pearlite isothermal decomposition in a Fe-C-Mn hypoeutectoid steel. Due to the strong influence, grain boundaries have on Pearlite transformation kinetics, morphological aspects of Pearlite from two conditions with very different AGS were studied and characterized. Results allow us to conclude that the formation of Pearlite and ferrite are favored for small AGS values, whereas a larger AGS led to an increase in the total amount of Pearlite volume fraction. Furthermore, the average size of pearlitic colonies increased with increasing AGS, and it appears that the interlamellar spacing of the Pearlite does not depend on AGS, but instead, is controlled by the isothermal decomposition temperature. Finally, it was observed that the ratio between lamellar thickness of ferrite and cementite depended on AGS.
Teruki Sadasue - One of the best experts on this subject based on the ideXlab platform.
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stress shielding and fatigue crack growth resistance in ferritic pearlitic steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007Co-Authors: Yoshiharu Mutoh, Akhmad A Korda, Yukio Miyashita, Teruki SadasueAbstract:Abstract The effect of Pearlite morphology on stage IIb (Paris regime) fatigue crack growth behavior in ferritic–pearlitic steel was investigated. Networked and distributed Pearlite structures were prepared. Constant-Δ K fatigue crack growth tests were performed in situ in a scanning electron microscope. The results revealed that a distributed Pearlite structure had better fatigue crack growth resistance than a networked Pearlite structure. From the in situ observations, the distributed Pearlite structure indicated a tortuous crack path, which induced crack interlocking as well as crack closure. For the networked Pearlite structure, some crack branching was found on the crack path. The crack growth curves for the two microstructures, plotted using the effective stress intensity factor range Δ K eff , where crack closure behavior is taken into consideration, did not coincide. The crack growth curves plotted using the crack tip effective stress intensity factor range Δ K eff,tip , where crack tip shielding behavior as well as crack closure are taken into consideration, successfully coincided on one line.
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fatigue crack growth behavior in ferritic pearlitic steels with networked and distributed Pearlite structures
International Journal of Fatigue, 2007Co-Authors: Akhmad A Korda, Yukio Miyashita, Yoshiharu Mutoh, Teruki SadasueAbstract:Abstract Effect of Pearlite morphology on fatigue crack growth behavior in ferritic–pearlitic steels was investigated. Networked-like and distributed Pearlite structures were prepared. ΔK decreasing/increasing and constant-ΔK fatigue crack growth tests have been performed inside an SEM chamber. The results revealed that distributed Pearlite structure had better fatigue crack growth resistance than networked-like Pearlite structure. Grain size and yield strength are the main factors controlling threshold value of the steels. In-situ observation revealed that the distributed Pearlite structure indicated tortuous crack path. This tortuous path contributed to crack interlocking as well as crack closure. It was observed that ferritic–pearlitic steel with distributed Pearlite structure inhibited the extent of plastic deformation around the crack compared to that in the networked-like Pearlite structure. Plastic zone size estimation by using their cyclic stress–strain curves showed that the plastic zone size in distributed Pearlite structure was smaller than that in the networked-like Pearlite structure.
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Fatigue crack growth behavior in ferritic–pearlitic steels with networked and distributed Pearlite structures
International Journal of Fatigue, 2007Co-Authors: Akhmad A Korda, Yukio Miyashita, Yoshiharu Mutoh, Teruki SadasueAbstract:Abstract Effect of Pearlite morphology on fatigue crack growth behavior in ferritic–pearlitic steels was investigated. Networked-like and distributed Pearlite structures were prepared. ΔK decreasing/increasing and constant-ΔK fatigue crack growth tests have been performed inside an SEM chamber. The results revealed that distributed Pearlite structure had better fatigue crack growth resistance than networked-like Pearlite structure. Grain size and yield strength are the main factors controlling threshold value of the steels. In-situ observation revealed that the distributed Pearlite structure indicated tortuous crack path. This tortuous path contributed to crack interlocking as well as crack closure. It was observed that ferritic–pearlitic steel with distributed Pearlite structure inhibited the extent of plastic deformation around the crack compared to that in the networked-like Pearlite structure. Plastic zone size estimation by using their cyclic stress–strain curves showed that the plastic zone size in distributed Pearlite structure was smaller than that in the networked-like Pearlite structure.
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effects of Pearlite morphology and specimen thickness on fatigue crack growth resistance in ferritic pearlitic steels
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Akhmad A Korda, Yukio Miyashita, Yoshiharu Mutoh, Teruki SadasueAbstract:Abstract Effect of Pearlite morphology and specimen thickness on fatigue crack growth (FCG) behavior in ferritic–pearlitic structural steels was investigated. Two steels with different Pearlite morphologies were employed: one had islands of Pearlite colonies and the other had uniformly distributed Pearlite particles. Δ K -decreasing/increasing FCG test was carried out by using a standard compact tension (CT) specimen with 6 mm thickness and a single edge cracked plate tension (SECT) specimen with 1.5 mm thickness. The results revealed that the uniformly distributed Pearlite microstructure had a FCG resistance higher than the islands of Pearlite colonies microstructure. To understand the effect of Pearlite morphology on crack growth behavior in the Paris regime in detail, constant-Δ K FCG tests with in situ SEM observation were also carried out. From in situ observations, tortuous crack path was found in the uniformly distributed Pearlite microstructure. These tortuous crack paths with large crack deflection angle would promote crack closure as well as crack tip stress shielding and then resulted in higher crack growth resistance. Thin specimen indicated lower FCG rate compared to thick specimen, which resulted from the difference of crack closure behavior.
