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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.
Discipline
- 81.07.Bc: Nanocrystalline materials
- 81.40.-z: Treatment of materials and its effects on microstructure, nanostructure, and properties
- 81.05.Bx: Metals, semimetals, and alloys
- 06.60.Mr: Testing and inspecting procedures
- 81.40.Ef: Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
- 81.40.Gh: Other heat and thermomechanical treatments
- 61.05.-a: Techniques for structure determination
Journal
Year
Volume
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Pages
1319-1323
Physical description
Dates
published
2017-05
Contributors
author
- Warsaw University of Technology, Faculty of Materials Science and Engineering, Wołoska 141, 02-507, Warsaw, Poland
author
- University of Science and Technology, Department of Materials Science and Engineering, al. prof. S. Kaliskiego 7, 85-796 Bydgoszcz, Poland
author
- Warsaw University of Technology, Faculty of Materials Science and Engineering, Wołoska 141, 02-507, Warsaw, Poland
author
- Warsaw University of Technology, Faculty of Production Engineering, L. Narbutta 85, 02-524 Warsaw, Poland
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv131n5b05kz