Effect of Destabilizing Heat Treatment on Solid-State Phase Transformation in High-Chromium Cast Irons

Ефременко, В. Г.; Shimizu, Kazumichi; Chabak, Yu. G.

doi:10.1007/s11661-013-1890-9

Cited by 52 publications

(35 citation statements)

References 27 publications

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“…[7][8][9] The microstructure in HCCI can be modified through alloy design, processing route and heat treatments (HTs), which can include destabilization, sub-critical and quenching treatments, or a combination thereof. 10,11 An optimal destabilization process is highly dependent on the temperature (900-1150°C) and holding time (5 min to 8 h), and thus, the used parameters together with the chemical composition (especially the Cr/C ratio) will determine the type of SC. 9,[12][13][14][15] The parameters used during destabilization also determine the amount of carbon that remains in solution in the austenitic matrix and therefore the amount of retained austenite, its final hardness and subsequent resistance.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Processing and Chemical Composition on Secondary Carbide Precipitation and Hardness in High-Chromium Cast Irons

et al. 2020

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The excellent abrasion resistance of high-chromium cast irons (HCCIs) is given by an optimal combination of hard eutectic and secondary carbides (SC) and a supporting matrix. The tailoring of the microstructure is performed by heat treatments (HTs), with the aim to adjust the final properties (such as hardness and abrasion resistance). In this work, the influence of chemical composition on the microstructure and hardness of HCCI_26%Cr is evaluated. An increase in the matrix hardness was detected after HTs resulting from combining precipitation of M 23 C 6 SC during destabilization, and austenite/martensite transformation during quenching. Kinetic calculations of the destabilization process showed that M 7 C 3 secondary carbides are the first to precipitate during heating, reaching a maximum at 850°C. During subsequent heating up to 980°C and holding at this temperature, they transformed completely to M 23 C 6. According to the MatCalc simulations, further precipitation of M 23 C 6 occurred during cooling, in the temperature range 980-750°C. Both phenomena were related to experimental observations in samples quenched after 0-, 30-, 60-and 90-min destabilization, where M 23 C 6 SC were detected together with very fine SC precipitated in areas close to eutectic carbides.

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Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Processing and Chemical Composition on Secondary Carbide Precipitation and Hardness in High-Chromium Cast Irons

et al. 2020

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“…Cabe destacar la presencia de carburos secundarios, precipitados principalmente en la austenita proeutéctica, mostrando ésta una coloración más oscura que la austenita del constituyente eutéctico. Esto pudiera deberse a la segregación del Mo hacia el líquido eutéctico favoreciendo un enriquecimiento de la asutenita eutéctica en este elemento, lo cual tiene un efecto inhibidor de la precipitación de carburos secundarios (Efremenko et al, 2013). La Fig.…”

Section: Resultsunclassified

Aplicación del ajuste de Rietveld para correlacionar la evolución microestructural de fundiciones blancas con 18 y 25% en Cromo, templadas en aceite y sucesivos revenidos, con el comportamiento frente al desgaste abrasivo y esfuerzos de flexión

2018

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Mediante la aplicación del método de afinamiento estructural de Rietveld se identificaron y cuantificaron las fases presentes en fundiciones blancas hipoeutécticas con 18 y 25% en Cromo, templadas en aceite y tras sucesivos revenidos a 500 ºC. Se correlacionaron los resultados con su comportamiento frente al desgaste abrasivo y bajo esfuerzos de flexión. En ambos casos el porcentaje de austenita retenida tras el temple resultó mínima. Durante los sucesivos revenidos, se constató en la calidad con 18% en Cromo una redisolución parcial de los carburos M7C3 junto a una transformación entre carburos mixtos secundarios M7C3 y M2C. La Martensita tras temple resultó un factor clave frente a la resistencia al desgaste abrasivo, resultando los revenidos tras el temple en aceite desfavorables para esta propiedad. La calidad con 25% en Cromo fue la que presentó un mayor contenido en martensita tras el temple, y por tanto la que mejor comportamiento presentó frente a este tipo de desgaste. Esta misma calidad, tras el doble revenido, fue la que mayor resistencia y capacidad de deformación alcanzó bajo esfuerzos a flexión. La fractura resultó frágil y mayoritariamente transgranular. Sin embargo, pudo observarse la presencia de zonas con fractura dúctil asociadas a martensita doblemente revenida.

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“…The vanadium compounds as important national strategy resources were widely used in petrochemical industry, catalyst, iron steel, due to its excellent physicochemical properties and also it was called as "vitamins of modern industry" [1][2][3][4][5][6]. As it had an electronic configuration of [Ar]3d 3 4s 2 , the vanadium valence could be V(II), V(III), V(IV) and V(V) the most common oxidation states [7].…”

Section: Introductionmentioning

confidence: 99%

Oxidative Leaching of Vanadium from Vanadium-Chromium Reducing Residue with MnO<sub>2</sub>

Peng¹,

Liu²,

Chen³

et al. 2019

Preprint

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This paper focused on the oxidative leaching process of vanadium from vanadium-chromium reducing residue in alkaline medium with MnO2. The effect of experimental parameters including reaction time, reaction temperature, dosage of MnO2, dosage of NaOH, and liquid-to-solid ratio on the leaching efficiency of vanadium had been studied. The results indicated that MnO2 was an efficient oxidant for leaching out of vanadium. The leaching efficiency of vanadium was up to 97.25% under optimal reaction conditions: reaction temperature of 90 ℃, reaction time of 60 min, dosage of MnO2 at 50 wt.%, concentration of NaOH at 30 wt.% and liquid-to-solid at 5:1 mL/g.

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Effect of Destabilizing Heat Treatment on Solid-State Phase Transformation in High-Chromium Cast Irons

Cited by 52 publications

References 27 publications

The Effect of Thermal Processing and Chemical Composition on Secondary Carbide Precipitation and Hardness in High-Chromium Cast Irons

The Effect of Thermal Processing and Chemical Composition on Secondary Carbide Precipitation and Hardness in High-Chromium Cast Irons

Aplicación del ajuste de Rietveld para correlacionar la evolución microestructural de fundiciones blancas con 18 y 25% en Cromo, templadas en aceite y sucesivos revenidos, con el comportamiento frente al desgaste abrasivo y esfuerzos de flexión

Oxidative Leaching of Vanadium from Vanadium-Chromium Reducing Residue with MnO<sub>2</sub>

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