Characterization of the microstructure of high-chromium cast irons using Mössbauer spectroscopy

Weber, K.; Regener, D.; Mehner, H.; Menzel, M.

doi:10.1016/s1044-5803(01)00143-7

Cited by 17 publications

(7 citation statements)

References 3 publications

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“…Figure 2 shows the XRD patterns of the specimens after different heat treatments. The phases of the HCCI mainly consist of martensite, retained austenite, and chromium carbides of M 7 C 3 (PDF: 17-0333) and M 23 C 6 (PDF: 5-0721) [14]; some differences could also be found in different specimens. For the as-cast specimen, the diffraction peak intensities of retained austenite and M 7 C 3 phases are higher than those of other specimens.…”

Section: Resultsmentioning

confidence: 99%

Effects of Heat-Treatment on the Microstructure and Wear Resistance of a High-Chromium Cast Iron for Rolls

Guo

Xiao

et al. 2016

Advances in Materials Science and Engineering

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The variations of microstructure and mechanical properties of a high-chromium cast iron for rolls were studied from as-cast to the final heat treatments. Results show that the as-cast microstructure of the HCCI consists of M7C3carbide, M23C6carbide, martensite matrix, and retained austenite. The large dendritic M7C3carbide surrounds the matrix, and the M23C6carbide is mainly distributed in the matrix. Part of M23C6carbide transforms to M7C3carbide and is dissolved in austenite during austenization at 1020°C. Thus, the amount of M23C6carbide decreases, whereas that of M7C3carbide increases after quenching; the highest hardness is also obtained. After tempering, the martensite transforms to a tempered martensite, and some carbide precipitates in the martensite matrix. The hardness also changes from HRC62.1, which corresponds to quenching, to HRC55.2 and HRC56.3, which correspond to once and twice tempering, respectively. However, tempering could improve the impact toughness and wear resistance of the HCCI.

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Section: Resultsmentioning

confidence: 99%

Effects of Heat-Treatment on the Microstructure and Wear Resistance of a High-Chromium Cast Iron for Rolls

Guo

Xiao

et al. 2016

Advances in Materials Science and Engineering

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“…The black curve represents the resulting sum of the curves. The areas under the singlet spectra indicate the low carbon austenite contents, under the doublets the high carbon austenite, and under the sextet, the martensite contents 24 .…”

Section: Resultsmentioning

confidence: 99%

Influence of Niobium Adding on the Microstructure and Abrasive Wear Resistance of a Heat-Treated High-Chromium Near-Eutectic Cast Iron Alloy

et al. 2022

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High chromium cast iron (HCCI) with levels around 26% Cr -2.9% C according to ASTM A 532 IIIA is widely used in systems where high abrasive wear resistance is required. To evaluate the niobium influence, HCCI with 0.5% Nb and 1% Nb additions were melted, besides one without niobium addition of for comparison. For characterization, X-ray diffractometry, scanning electron microscopy (SEM), Vickers microhardness tests, Rockwell C hardness, carbide quantifications, quantification of the retained austenite by Mössbauer spectroscopy, and rubber wheel abrasion test according to procedure A of ASTM G-65 were performed. The results indicated a reduction in the average size, average perimeter, and carbides volumetric fraction (CVF) due to the addition of niobium, also changing the microstructure of the HCCI from eutectic to hypoeutectic. In some regions, NbC 0.75 carbides formed a coating around M 7 C 3 carbides. The 0.5% Nb alloy showed the best performance in the rubber wheel abrasive wear test, with a 37% average volume loss reduction as compared to the sample without niobium addition with a 130N load and 34% with a 45N load. The 0.5% Nb alloy also had the highest content of retained austenite among the investigated alloys.

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“…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

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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.

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Characterization of the microstructure of high-chromium cast irons using Mössbauer spectroscopy

Cited by 17 publications

References 3 publications

Effects of Heat-Treatment on the Microstructure and Wear Resistance of a High-Chromium Cast Iron for Rolls

Effects of Heat-Treatment on the Microstructure and Wear Resistance of a High-Chromium Cast Iron for Rolls

Influence of Niobium Adding on the Microstructure and Abrasive Wear Resistance of a Heat-Treated High-Chromium Near-Eutectic Cast Iron Alloy

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

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