Kinetics of Secondary Carbides Precipitation in a High-Chromium White Iron

Bedolla-Jacuinde, A.; Arias, Leonardo; Hernández, B.

doi:10.1361/105994903770342881

Cited by 88 publications

(64 citation statements)

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“…Furthermore, even longer holding times and higher holding temperatures cause a coarsening of the carbides and reduces the number of secondary carbides due to Ostwald ripening process. 27,28) Previous works 27,28) agree with the results of this study regarding the growth of secondary carbides.…”

Section: Secondary Carbides Formationsupporting

confidence: 89%

“…More specifically, it was started at about 10 min at 900°C and 5 min at 1 000°C and 1 150°C. 28) However, from the present in-situ observation results, the precipitation of secondary carbides started at about 840°C in the γ phase region during the heating stage under 10°C/min heating rate before the holding temperature was reached, as shown in Fig. 11.…”

Section: Secondary Carbides Formationmentioning

confidence: 56%

“…26) Some researchers gave the kinetics description of secondary carbides and discussed when the precipitation will occur. 2,27,28) Almost all of the literature reports concluded that precipitation occurred during the holding period, as is shown in Table 1. Powell et al 2) reported that the precipitation occurs during the first 15 min and Kuwano et al 27) reported that precipitation occurs after 1 min when reaching a 1 000°C holding temperature.…”

Section: Secondary Carbides Formationmentioning

confidence: 99%

“…Powell et al 2) reported that the precipitation occurs during the first 15 min and Kuwano et al 27) reported that precipitation occurs after 1 min when reaching a 1 000°C holding temperature. BedollaJacuinde et al 28) reported that the time of precipitation depends on the holding temperature. More specifically, it was started at about 10 min at 900°C and 5 min at 1 000°C and 1 150°C.…”

Section: Secondary Carbides Formationmentioning

confidence: 99%

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Dynamic Precipitation Behavior of Secondary M7C3 Carbides in Ti-alloyed High Chromium Cast Iron

et al. 2013

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In-situ observations on the dynamic precipitation behavior of secondary carbides in Ti-alloyed High Chromium Cast Iron (HCCI) were performed by using a Confocal Laser Scanning Microscope (CLSM). Moreover, the detailed characterization of the microstructure before and after heat treatment was performed by using scanning electron microscopy (SEM). The secondary carbides, which precipitate from the matrix during heat treatment, were identified as M7C3 type carbides by using transmission electron microscopy (TEM). The number, size and volume of secondary carbides during heating, holding and cooling process were quantitatively evaluated based on the in-situ observation and SEM results. It was found that ferrite (α) and secondary carbides start to precipitate from the matrix at around 575°C and 840°C, respectively, during the heating process. In addition, the in-situ results showed that the number of secondary carbides increase with an increased heating temperature and time. Moreover, it was found that the size of these secondary carbides increase at higher temperatures and longer holding times. However, the number of secondary carbides increased with a decreased temperature. Finally, it was found that the volume fraction (~5%) of secondary carbides was not changed to a large extent for the different heat treatment conditions being investigated.

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Section: Secondary Carbides Formationsupporting

confidence: 89%

Section: Secondary Carbides Formationmentioning

confidence: 56%

Section: Secondary Carbides Formationmentioning

confidence: 99%

Section: Secondary Carbides Formationmentioning

confidence: 99%

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Dynamic Precipitation Behavior of Secondary M7C3 Carbides in Ti-alloyed High Chromium Cast Iron

et al. 2013

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“…Es característica en estos materiales la presencia de carburos en cantidades importantes. El tratamiento térmico provoca, generalmente, la aparición de carburos secundarios distribuidos y con mayor o menor finura [3,[11][12][13] .…”

Section: Introductionunclassified

Influencia del contenido de silicio y el tratamiento térmico en la resistencia al desgaste de fundiciones blancas al cromo en condiciones de rápida solidificación

Pérez¹,

Varela²,

Verhaege³

et al. 2012

REVMETAL

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Las fundiciones blancas al cromo constituyen un material de frecuente aplicación en la fabricación de diferentes elementos de la industria minera y de canteras [1][2][3][4][5] desde el pasado siglo. Su alta resistencia al desgaste, unida a una buena resistencia al impacto, las hace la selección obligada en muchas aplicaciones.Una de las causas de la popularidad de estas fundiciones ha sido la posibilidad de obtención de diferentes estructuras en la matriz, sea directamente de colada o mediante diferentes tratamientos térmicos, aspectos que se vienen estudiando desde su introducción [5][6][7][8] .Las fundiciones blancas al cromo presentan contenidos de cromo entre 12-30 %, con adiciones de otros elementos de aleación, comúnmente molibdeno y níquel, según consigna la especificación A532 de la ASTM. En estado bruto de colada la matriz es comúnmente perlítica [9][10][11] , aunque en función de las dimensiones de la pieza y los elementos de aleación ResumenSe estudia la influencia del silicio y el tratamiento térmico sobre la microestructura y la resistencia al desgaste abrasivo y por fricción seca de una fundición con 3 % C y 12 % Cr, obtenida en condiciones de rápida solidificación. La rápida solidificación disminuye el volumen de carburos, la finura y dispersión de éstos aumentan con el incremento del silicio. Todas las muestras presentaron matrices perlíticas, variando en finura con el tratamiento. No se apreciaron productos de transformación intermedios. Las durezas tuvieron poca variación. Los tratamientos de austenización mostraron poca efectividad, con tendencia a desgastes más elevados que en estado bruto de colada y con tratamiento de mantenimiento. Los comportamientos ante la abrasión y la fricción seca en las condiciones ensayadas fueron similares. Se evidenció alta influencia de la morfología de los carburos en el desgaste abrasivo. Palabras claveFundiciones blancas al cromo; Tratamiento térmico; Desgaste abrasivo; Fricción seca. Influence of silicon content and heat treatment on wear resistance of white chromium cast irons under high speed solidification conditions AbstractThe influence of silicon content and heat treatment on microstructure, abrasive and dry friction wear resistance of a 3 % C, 12 % Cr cast iron, under fast solidification conditions is studied. The fast solidification condition diminishes the carbide volume and the silicon content increases their dispersion and finesses. All matrixes obtained were perlitics, whit different finesses. No intermediate transformation products were noticed. Hardness had little variation. Austenization treatment show little affectivity, with tendency to increase wear in reference to as cast and maintenance treatments. Behavior under dry friction and abrasive wear were similar under test conditions applied whit more influence of carbide morphology in the abrasive wear conditions.

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Effect of Copper Additions on Secondary Carbide Precipitation in High Chromium with Cast Iron

Guerra

Bedolla-Jacuinde

Mejı́a

et al. 2016

Characterization of Metals and Alloys

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Kinetics of Secondary Carbides Precipitation in a High-Chromium White Iron

Cited by 88 publications

References 12 publications

Dynamic Precipitation Behavior of Secondary M7C3 Carbides in Ti-alloyed High Chromium Cast Iron

Dynamic Precipitation Behavior of Secondary M7C3 Carbides in Ti-alloyed High Chromium Cast Iron

Influencia del contenido de silicio y el tratamiento térmico en la resistencia al desgaste de fundiciones blancas al cromo en condiciones de rápida solidificación

Effect of Copper Additions on Secondary Carbide Precipitation in High Chromium with Cast Iron

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