Nanoausferritic matrix of ductile iron

Myszka, D.; Wasiluk, K.; Skoek, E.; Świątnicki, W.

doi:10.1179/1743284714y.0000000733

Cited by 11 publications

(10 citation statements)

References 12 publications

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“…Similar report was provided by Myszka, et al (2015) and Myszka, et al (2014) which tried to produce nanostructured ADI by austempering at lower bainitic transformation temperature range for a prolonged period and achieved a significant refinement of ferrite plates in less than 100 nm range. Putatunda et al (2015) in its investigation likewise developed ADI possessing microstructure at nano scale with the aid of high temperature deformation and subsequently, austempering of the ductile iron.…”

Section: Processing Techniques Of Nanostructured and Nanocomposite Austempered Ductile Ironssupporting

confidence: 69%

A Review on the Prospect for the Development of Nanostructured and Nanocomposite Aluminium-Alloyed Austempered Ductile Iron

et al. 2019

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This review paper has established austempered ductile iron (ADI) as a classical material that has spectra of properties achieved by altering some processing parameters through heat treatment procedures. Concerted efforts have been made to equally explore the use of additives as additional materials to this all important alloy. The use of modifiers at ultra-fine or nano-scale level as additive to the melt prior casting has also been reviewed. However, the continuous quest for innovative approaches of upgrading the structural and mechanical characteristics of ductile irons has open up interest in the development of nanostructured and nanocomposite components in bulky iron bearing materials. This paper cross-examines few available literatures on the nanostructured ADI with the aim of adopting similar methodology in the development of nanostructured aluminium-alloyed DI and nanostructured aluminium-alloyed ADI. Emphasy is laid on reviewing the production techniques and treatment parameters on the processing of the developed nanostructured aluminium-alloyed DI and/or aluminium-alloyed DI nanocomposites and with respect to their usage at low, moderate and extremely high and low temperatures. Keywords— aluminium-alloyed austempered ductile iron; development; nano-tructured; nanocomposite; processing; modifiers

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Section: Processing Techniques Of Nanostructured and Nanocomposite Austempered Ductile Ironssupporting

confidence: 69%

A Review on the Prospect for the Development of Nanostructured and Nanocomposite Aluminium-Alloyed Austempered Ductile Iron

et al. 2019

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“…Electron diffraction patterns analysis revealed that the microstructure consisted of thin bainitic ferrite plates separated by thin layers of retained austenite. In case of steels this kind of microstructure is called nanobainite [13][14][15], while in ductile iron we can speak of nanoausferrite [6,7]. The average width of ferritic plates was similar for both samples and it was 126 ± 13 nm and 116 ± 7 nm in ADI-1 and ADI-2, respectively.…”

Section: Resultsmentioning

confidence: 71%

“…One of directions of the research work was to produce the alloys with nanocrystalline microstructure and precisely designed phase composition [4][5][6][7]. However, to control the phase composition, especially the content of the retained austenite is not an easy task and needs application of the accurate methods of phases volume fraction determination.…”

Section: Introductionmentioning

confidence: 99%

The Comparative Study of the Microstructure and Phase Composition of Nanoausferritic Ductile Iron Alloy Using SEM, TEM, Magnetometer, and X-Ray Diffraction Methods

et al. 2017

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In this paper the microstructure and phase composition of ausferritic ductile iron alloy were investigated by scanning electron microscopy, transmission electron microscopy and X-ray diffraction methods. In order to obtain the nanoausferritic microstructure in the alloy, the austempering heat treatment was performed at relatively low temperature. As a result, a specific kind of microstructure, containing nanocrystalline ausferrite and retained austenite blocks, was obtained in each heat-treated sample. The volume fractions of phases were determined using different methods: MicroMeter software for scanning electron micrographs, stereological analysis for transmission electron micrographs, quantitative analysis of the X-ray diffraction spectra and magnetometer measurements. All methods revealed a high amount of retained austenite which varied as a function of the austempering treatment parameters. It was shown that the quantitative phase composition measured by X-ray diffraction and magnetometer, in all samples investigated, differs significantly from the stereological measurements and image analysis performed through the MicroMeter software. The possible reasons of the observed differences were discussed.

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“…Furthermore, only slight changes in the graphite morphology were observed in the UST SG irons. Recently, it was found that thermomechanical treatment 34,35 or performing very long austempering time 36 could lead to evolution of a novel nano-scale ADI microstructure, with an exceptional combination of strength and ductility properties.…”

Section: Introductionmentioning

confidence: 99%

Ultrafine Ductile and Austempered Ductile Irons by Solidification in Ultrasonic Field

Ahmed

Riedel

Kovalko³

et al. 2021

Inter Metalcast

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In this research, ultrasonic melt treatment (UST) was used to produce a new ultrafine grade of spheroidal graphite cast iron (SG iron) and austempered ductile iron (ADI) alloys. Ultrasonic treatment was numerically simulated and evaluated based on acoustic wave streaming. The simulation results revealed that the streaming of the acoustic waves propagated as a stream jet in the molten SG iron along the centerline of the ultrasonic source (sonotrode) with a maximum speed of 0.7 m/s and gradually decreased to zero at the bottom of the mold. The metallographic analysis of the newly developed SG iron alloy showed an extremely ultrafine graphite structure. The graphite nodules’ diameter ranging between 6 and 9 µm with total nodule count ranging between 900 to more than 2000 nodules per mm2, this nodule count has never been mentioned in the literature for castings of the same diameter, i.e., 40 mm. In addition, fully ferritic matrix was observed in all UST SG irons. Further austempering heat treatments were performed to produce different austempered ductile iron (ADI) grades with different ausferrite morphologies. The dilatometry studies for the developed ADI alloys showed that the time required for the completion of the ausferrite formation in UST alloys was four times shorter than that required for statically solidified SG irons. SEM micrographs for the ADI alloys showed an extremely fine and short ausferrite structure together with small austenite blocks in the matrix. A dual-phase intercritically austempered ductile iron (IADI) alloy was also produced by applying partial austenitization heat treatment in the intercritical temperature range, where austenite + ferrite + graphite phases coexist. In dual-phase IADI alloy, it was established that introducing free ferrite in the matrix would provide additional refinement for the ausferrite.

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Nanoausferritic matrix of ductile iron

Cited by 11 publications

References 12 publications

A Review on the Prospect for the Development of Nanostructured and Nanocomposite Aluminium-Alloyed Austempered Ductile Iron

A Review on the Prospect for the Development of Nanostructured and Nanocomposite Aluminium-Alloyed Austempered Ductile Iron

The Comparative Study of the Microstructure and Phase Composition of Nanoausferritic Ductile Iron Alloy Using SEM, TEM, Magnetometer, and X-Ray Diffraction Methods

Ultrafine Ductile and Austempered Ductile Irons by Solidification in Ultrasonic Field

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