Optimizing heat treatment and wear resistance of high chromium cast irons using computational thermodynamics

Albertin, Eduardo; Neto, Flávio Beneduce; Matsumoto, Mineo; Teixeira, Ivênio de Oliveira

doi:10.1016/j.wear.2011.01.079

Cited by 22 publications

(17 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The maximum hardness peak (63 HRC) was reached at 1000°C after 6 hours. This value is similar to the literature [18][19][20]. In Figure 5 (b), the amount of carbides decreases over time, at 1050°C.…”

Section: Heat Treatmentsupporting

confidence: 90%

See 1 more Smart Citation

Wear resistance of high chromium white cast iron for coal grinding rolls

Ortega-Cubillos

Nannetti-Bernardini

Fredel

et al. 2015

Rev. Fac. Ing. Antioquia

View full text Add to dashboard Cite

High chromium white cast iron alloy used in coal grinding components is a material that may present different wear resistance depending on the thermal treatment used in its manufacturing. In this context, the properties of this alloy, containing 22% chromium and 3% carbon, were investigated after applying different heat treatments and their infl uence on the abrasion wear resistance was evaluated. For the characterization of the alloy, several experimental tests were performed using the following laboratory equipment: durometer, microdurometer, optical microscope, scanning electron microscope (SEM), X-ray diffraction, emission spectral photometry and equipment for wear testing according to the ASTM G65-04 (2010) standard. The results obtained reveal that the wear resistance of the selected alloy increases when a lower amount of austenite is retained in the matrix and high precipitation of secondary chromium carbides occurs. They also suggest that it is not necessary to use long times for the alloy destabilization in order to obtain higher hardness values and good wear resistance when the alloy is previously annealed, in contrast to what is practiced in the industry. RESUMEN:Las fundiciones blancas al alto cromo utilizadas en componentes de molinos de carbón son materiales que presentan diferentes resistencias al desgaste, dependiendo del tratamiento térmico usado en su fabricación. Las propiedades mecánicas, microestructurales y tribológicas de la aleación con 22% de cromo y 3% de carbono (II D ASTM A532-10) y su infl uencia en la resistencia al desgaste fueron investigadas. Para la caracterización de la aleación fueron realizados diversos ensayos, utilizando los siguientes equipos de laboratorio: durómetro, microdurómetro, microscopio óptico, microscopio electrónico de barrido, difracción de rayos X, espectrofotómetro de emisión óptica, y equipo para ensayo de desgaste abrasivo de acuerdo con la norma ASTM G65-04 (2010). Los resultados encontrados mostraron que la resistencia al desgaste incrementa cuando la matriz tiene una baja fracción volumétrica de austenita retenida y una alta fracción de carburos secundarios. También indican que no es necesario usar largos tiempos durante la desestabilización en la aleación II D para obtener una óptima resistencia al desgaste, cuando la aleación fue previamente recocida. Estos resultados indican que la industria puede usar tiempos cortos durante la desestabilización de los rodillos de molinos de carbón.

show abstract

Section: Heat Treatmentsupporting

confidence: 90%

“…Figures 2 and 3 show the trends in the hardness behavior. Similar results are shown in other works [3,5,18,19]. Figure 2 shows the changes in the hardness when increasing the temperature and the effect of treatment time for the high-chromium white cast iron alloy in the initial as-cast state.…”

Section: Heat Treatmentsupporting

confidence: 86%

Wear resistance of high chromium white cast iron for coal grinding rolls

Ortega-Cubillos

Nannetti-Bernardini

Fredel

et al. 2015

Rev. Fac. Ing. Antioquia

View full text Add to dashboard Cite

show abstract

“…However, the balls shall be subjected to appropriate heat treatments for improving their mechanical properties. Under these conditions, among the many parameters and criteria to be retained during these heat treatments are the austenitization temperature, the time and tempering [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Influence of Tempering on Microstructure and Wear Properties of High Alloy Chromium Cast Iron

Younes

Sad-eddine

Bradai

et al. 2021

Advances in Materials Science

View full text Add to dashboard Cite

Mechanical properties, wear resistance and impact resistance of a high-alloy chromium cast iron used in the fabrication of grinding balls have been studied. A rank of tempering heat treatments under several temperatures 500°C, 525°C, 550°C and 575°C was performed after austenitized at 1050°C. The Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) techniques have been used to characterize the microstructures and identify the phases. The wear balls tests were conducted in a rotating drum with a velocity 0.5 r/s. The tribological tests were carried out by evaluated a weight loss as function time. The measurement of the rebound resilience was determined by Charpy impact tests. The results of XRD showed the presence of the martensite, carbides type M7C3 and M2C for all tempering heat treated. The hardness of the sample increased after the tempering and reach nearly 65 HRC at 1050°C. In another hand, it decreased after the tempering treatment it could be explained by precipitation of the carbides type M2C.

show abstract

“…The focus of research is reducing material wear rate [2]. Some techniques have been adopted to further enhance HCCI's mechanical properties and expand its application range, such as alloying [3][4][5][6][7][8][9][10][11][12][13], modification treatment [14,15] and heat treatment [3,[16][17][18][19][20][21]. These techniques can strengthen HCCI's matrix, optimize its microstructure, and adjust M 7 C 3 type carbide's size and morphology.…”

Section: Introductionmentioning

confidence: 99%

Sintering Preparation of 15 wt% Cr Cast Iron as well as Its Mechanical Properties and Impact Abrasive Wear

Xiao

Brânduşan

et al. 2020

Period. Polytech. Chem. Eng.

View full text Add to dashboard Cite

15 wt% Cr sintered High Chromium Cast Iron (HCCI) with full density was successfully prepared by Super-solidus Liquid Phase Sintering (SPLS) technique, with water atomized 15 wt% Cr high chromium cast iron powder as initial materials. Its densification behavior and microstructure evolution in SPLS process and mechanical properties were investigated systematically. Additionally, the impact abrasive wear resistance under different impact energies were also analyzed and compared with another sintered HCCI with 20 wt% Cr. The results indicated that sintering temperature has a strong influence on the sintered alloy’s density, hardness, impact toughness and bending strength. The M7C3 type (M is Cr and Fe) carbides were obviously coarsened as temperature increased and their rod-shaped branches were fully developed at the same time, thereby resulting in carbide network formation in the matrix. The reasonable sintering temperature range was 1195–1205 °C, and the optimum mechanical properties had the hardness of 63.9 HRC, bending strength of 2112.65 MPa and impact toughness of 7.92 J/cm2. What is more important impact abrasive wear test results indicated 15 wt% Cr sintered HCCI’s wear resistance could be comparable to 20 wt% Cr sintered HCCI under impact energy 1~3 J/cm2, and it is more cost effective.

show abstract

Optimizing heat treatment and wear resistance of high chromium cast irons using computational thermodynamics

Cited by 22 publications

References 12 publications

Wear resistance of high chromium white cast iron for coal grinding rolls

Wear resistance of high chromium white cast iron for coal grinding rolls

Investigation on the Influence of Tempering on Microstructure and Wear Properties of High Alloy Chromium Cast Iron

Sintering Preparation of 15 wt% Cr Cast Iron as well as Its Mechanical Properties and Impact Abrasive Wear

Contact Info

Product

Resources

About