Kinetics of austenite formation during continuous heating in a low carbon steel

Oliveira, Fernando Lucas Gonçalves e; Andrade, Margareth Spangler; Cota, André Barros

doi:10.1016/j.matchar.2006.04.027

Cited by 115 publications

(80 citation statements)

References 9 publications

(18 reference statements)

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“…Previous studies 13 have shown that these mechanisms can depend on the heating rates. Dilatometry has been largely used for studies of phase transformations on several types of steels 14 , such as low-carbon steels 15 and maraging steels 13,16 . In this work the dilatometric technique was used to study the influence of chemical composition on precipitation and the martensite reversion phenomena, as well as to evaluate the activation energies of these phase transformations during the heating stage.…”

Section: Introductionmentioning

confidence: 99%

A dilatometric study of the phase transformations in 300 and 350 maraging steels during continuous heating rates

et al. 2013

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The influences of the chemical composition and heating rate have been studied in 300 and 350 maraging steels using dilatometry. For these tests, heating was carried out with heating rates of 1, 10 and 28 °C/s. The results have shown that the precipitation mechanism for both materials in the studied range is by lattice diffusion. Furthermore, Co and Ti contents influence strongly the precipitation. The lattice diffusion mechanism in the martensite reversion is influenced by Ni and Co contents and heating rate. For small heating rates ( ~1 °C/s) this mechanism prevails in the 300 maraging steel while for the 350 maraging steel has a minor importance. The mechanism of martensite reversion for 350 maraging steel in the studied range is mainly by shear mechanism. For higher heating rates (~28 ºC/s) the shear mechanism prevails in both maraging steels.

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Section: Introductionmentioning

confidence: 99%

A dilatometric study of the phase transformations in 300 and 350 maraging steels during continuous heating rates

et al. 2013

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“…Many of these studies use commercial dilatometry equipment to determine transformation kinetics through dilatometric specimens of different shapes and sizes, for example, solid cylindrical shape, hollow, or flat in small sizes, ensuring that the changes in volume obtained are due solely to the phase transformation or the internal changes in the material and not to distortion caused by the thermal shock in the heating and quenching stages. Likewise, the dilatometry devices can use different heating media such as magnetic induction, thermal radiation, and direct current or Joule heating [3], [7] and [8]. This latter medium is characterized by providing thermal homogeneity in the material and good control of the heating rate (HR), which can remain constant for the whole heating stage.…”

Section: Introductionmentioning

confidence: 99%

Electric-Thermo-Mechanical Analysis of Joule Heating in Dilatometric Specimens

Herrejón-Escutia

Solorio-Díaz

Vergara–Hernández

et al. 2017

SV-JME

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“…El análisis teórico de las temperaturas producidas por el proceso de temple superficial con láser ha dado lugar a numerosos trabajos que abarcan desde la utilización de modelos simplificados como en Cordovilla-Baró et al (2014), hasta modelos tridimensionales basados en el método de los elementos finitos (García-Beltrán et al, 2007;Leung et al, 2007;Oliveira et al, 2007;García-Beltrán et al, 2008;Bailey et al, 2009). Sin embargo, estos trabajos, o bien utilizan un valor constante para caracterizar la absorción, o bien plantean el incremento de absorción asociado a la oxidación como una función de la temperatura instantánea.…”

Section: Introduccionunclassified

Caracterización de la reacción de oxidación superficial y su influencia sobre la absorción de radiación durante el proceso de temple superficial con láser para el acero 42CrMo4

Cordovilla

Domínguez²,

Sancho³

et al. 2016

REVMETAL

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RESUMEN:El temple superficial con láser es un proceso en el que se depositan elevadas expectativas por sus innumerables ventajas en términos de calidad y productividad frente al temple por inducción. Su implantación efectiva, no obstante, se está viendo lastrada ante la falta de herramientas predictivas fiables y flexibles. Existen diversos modelos para el cálculo de temperaturas, aunque pocos realizan un tratamiento exhaustivo de la oxidación superficial y sus importantísimas implicaciones sobre la absorción de radiación láser. Este artículo adopta un modelo acoplado temperaturas/oxidación disponible en la literatura, utilizándolo, por primera vez, para la simulación de procesos sencillos llevados a cabo en distintas condiciones de potencia y velocidad, para el acero 42CrMo4. Dichas condiciones han sido reproducidas experimentalmente, registrando la temperatura máxima superficial y el espesor de óxido generado. Ambos resultados han mostrado un elevado grado de coincidencia con los resultados teóricos, avalando la fiabilidad y utilidad del modelo.PALABRAS CLAVE: Absorción; Acero; Láser; Oxidación; Superficial; Temple Citation / Cómo citar este artículo: Cordovilla, F., Domínguez, J., Sancho, P., García-Beltrán, A., Ocaña, J.L. (2016) "Caracterización de la reacción de oxidación superficial y su influencia sobre la absorción de radiación durante el proceso de temple superficial con láser para el acero 42CrMo4". Rev. Metal. 52(2):e067. doi: http://dx.doi.org/10.3989/ revmetalm.067. ABSTRACT: Characterization of the surface oxidation reaction and its influence on the radiation absorption during the surface laser hardening process of the 42CrMo4 steel.Surface laser hardening of steel is a process that produces an enormous interest due to its uncountable advantages in terms of quality and productivity against induction hardening The effective implantation of this process, nevertheless, is been hampered because of the lack of reliable and flexible predictive tools. There are different models focused on the temperature calculation, thought, few make a thorough analysis of the surface oxidation associated with the process and its important implications over the absorption coefficient. This work proposes and explains a coupled model temperature/ oxidation available in literature, applied, for the first time, for the simulation of simple processes carried out with different conditions of power and speed, for the 42CrMo4 steel. These conditions have been reproduced experimentally, tracking the maximum surface temperature and the oxide thickness. Both results have shown a high degree of coincidence whit theoretical predictions, confirming the capabilities and utility of the model.

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Kinetics of austenite formation during continuous heating in a low carbon steel

Cited by 115 publications

References 9 publications

A dilatometric study of the phase transformations in 300 and 350 maraging steels during continuous heating rates

A dilatometric study of the phase transformations in 300 and 350 maraging steels during continuous heating rates

Electric-Thermo-Mechanical Analysis of Joule Heating in Dilatometric Specimens

Caracterización de la reacción de oxidación superficial y su influencia sobre la absorción de radiación durante el proceso de temple superficial con láser para el acero 42CrMo4

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