Microstructure Control of High-alloyed White Cast Iron

Kawalec, M.

doi:10.2478/afe-2014-0012

Cited by 6 publications

(7 citation statements)

References 7 publications

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“…3 (a-b) a la 5 (a-b). Este resultado está relacionado con la diferencia de composición química de la capa de revestimiento que deposita cada consumible, tal como se apreció en la Tabla 1, en particular por el efecto del V, por ser uno de los elementos con mayores potencialidades de formar carburos, y también por su influencia en el valor de la temperatura de transformación eutéc-tica (Unkić et al, 2003;Nedeljković et al, 2010;Wang y Li, 2010;Kawalec, 2014). En la Fig.…”

Section: Resultados Obtenidos Mediante Microscopíaunclassified

“…Por otro lado, utilizando el mismo sistema aleante se analiza el efecto del V desde 1,2 hasta 11,3% en diferentes fundiciones tratadas térmi-camente, demostrándose que este elemento conduce a la presencia de carburos finos en la matriz, aumentando notablemente la dureza y la resistencia al desgaste (Unkić et al, 2003). El empleo de hierros fundidos altamente aleados con contenidos de V aún mayores (15%), conjuntamente con pequeñas cantidades de W, Ti y La, fue evaluado con la finalidad de controlar el tipo de microestructura (Kawalec, 2014). En los resultados obtenidos en los trabajos anteriormente citados se concluye que en todas las variantes se forman ferrita aleada y eutécticos con diferentes tipos de carburos, hacien do que la fragilidad sea elevada.…”

Section: Introductionunclassified

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Análisis microestructural de revestimientos de fundiciones blancas hipoeutécticas con adiciones de Si y V

et al. 2018

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RESUMEN:Las aleaciones utilizadas para el revestimiento de superficies sometidas a baja o moderada abrasión son altamente complejas. Con la finalidad de buscar una alternativa más simple, en el presente trabajo se estudian tres revestimientos, aplicados utilizando electrodos con diferentes composiciones basadas en fundiciones hipoeutéticas Fe-Si-V-C con 3,2 % de C, V entre 0,47 y 1,57 %, y Si entre 2,30 y 3,82 %. Los revestimientos resultantes fueron estudiados utilizando técnicas de microscopía óptica (MO), microscopía electrónica de barrido (MEB), difracción de rayos X (DRX) y dureza. Los resultados mostraron que para contenidos de Si y V bajos, se obtuvo la dureza más elevada (64 HRC), derivada de una microestructura donde predominan la martensita y la austenita. Al aumentar las cantidades de estos elementos en la aleación, se obtuvo mayoritariamente perlita, con zonas eutécticas y carburos de V distribuidos en ellas, originando una disminución de la dureza hasta 57 HRC. Por lo tanto, utilizando contenidos de Si y V bajos (cercanos a 2,30 % de Si y 0,47 % de V), los electrodos basados en el sistema aleante Fe-Si-V-C pueden ser una alternativa para revestir superficies sometidas a desgaste abrasivo bajo o moderado. ABSTRACT: Microstructural analysis of hypoeutectic white cast iron coatings with Si and V additions.Alloy systems used as coatings in surfaces under low or moderate abrasion are highly complex. In order to search for a simpler system, in this work three coatings were studied, applied using electrodes with different compositions, based on hypoeutectic white cast irons, with 3.2% C, V from 0.47 to 1.57%, and Si from 2.30 to 3.82%. Resulting coatings were studied using Optical (OM) and Scanning Electron Microscopies (SEM), X-ray diffraction (XRD) and hardness measurements. Results showed that maximum hardness (64 HRC) was obtained for low Si and V contents, due to a microstructure mainly composed by martensite and austenite. The increase in Si and V contents led to significant modifications in the microstructures, being perlite the main phase, with the presence of eutectic zones and V carbides. These modifications originated lower hardness for these coatings (57 HRC). This study allowed to define that using low Si and V contents (close to 2.30% Si and 0.47% V), electrodes of the Fe-Si-V-C system can be an alternative for coating surfaces under low or moderate abrasive wear.

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Section: Resultados Obtenidos Mediante Microscopíaunclassified

Section: Introductionunclassified

Análisis microestructural de revestimientos de fundiciones blancas hipoeutécticas con adiciones de Si y V

et al. 2018

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“…For this reason, for the in-situ composites, regular types of eutectic are selected [1,2]. The vanadium eutectic crystallising in Fe-C-V alloys is known to be in the group of regular fibrous eutectics [1][2][3][4][5][6] -the fact that enables its crystallisation in the form of an oriented structure. An attempt to produce oriented structure in the eutectic Fe-C-V alloys has been taken in [1,2].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic in Situ Metal Matrix Composite Reinforced with VC Carbide Fibres

Kawalec¹,

Górny²,

Sikora³

2015

Archives of Foundry Engineering

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A eutectic reaction is a basic liquid-solid transformation, which can be used in the fabrication of high-strength in situ composites. In this study an attempt was made to ensure directional solidification of Fe-C-V alloy with hypereutectic microstructure. In this alloy, the crystallisation of regular fibrous eutectic and primary carbides with the shape of non-faceted dendrites takes place. According to the data given in technical literature, this type of eutectic is suitable for the fabrication of in-situ composites, owing to the fact that a flat solidification front is formed accompanied by the presence of two phases, where one of the phases can crystallise in the form of elongated fibres. In the present study an attempt was also made to produce directionally solidifying vanadium eutectic using an apparatus with a very high temperature gradient amounting to 380 W/cm at a rate of 3 mm/h. Alloy microstructure was examined in both the initial state and after directional solidification. It was demonstrated that the resulting microstructure is of a non-homogeneous character, and the process of directional solidification leads to an oriented arrangement of both the eutectic fibres and primary carbides.

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“…Phase equilibrium systems are the basis for the interpretation of the structure of all alloys. They illustrate the phase composition of alloys and phase transitions as a function of the chemical composition of the alloy and temperature [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Addition of Titanium on The Structure and Properties of High Chromium Cast Iron

Kopyciński¹,

Guzik²,

Siekaniec³

et al. 2015

Archives of Foundry Engineering

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The paper presents results of Ti-addition to High Chromium Cast Iron (HCCI) on the structure and selected mechanical properties. For this study casted two sets of cylinders with dimensions ø20 mm, ø15 mm × 250 mm, for the High Chromium Cast Iron (HCCI) and with the 4% by mass Ti-addition. Melts were performed in the induction furnace crucible capacity of 15 kg. During the heats the cup with installed S type thermocouple was poured to record the cooling curves. The cylinders were subjected to the static bending strength test. Samples for the test microstructure and Rockwell hardness were cut from the cylinders. The study shows that the addition of titanium had an impact on the structure and thus the properties of High Chromium Cast Iron (HCCI). In subsequent studies, through an appropriate choice of chemical composition and proper process control, it is planned to obtain in the structure the titanium carbides TiC and chromium carbides with type (Cr, Fe)7C3.

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Microstructure Control of High-alloyed White Cast Iron

Cited by 6 publications

References 7 publications

Análisis microestructural de revestimientos de fundiciones blancas hipoeutécticas con adiciones de Si y V

Análisis microestructural de revestimientos de fundiciones blancas hipoeutécticas con adiciones de Si y V

Anisotropic in Situ Metal Matrix Composite Reinforced with VC Carbide Fibres

The Effect of Addition of Titanium on The Structure and Properties of High Chromium Cast Iron

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