Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron
Dual-phase ADI material microstructure consists of different amounts and morphologies of ausferrite and free ferrite, obtained by subjecting ductile iron to specific heat treatment. Its strength is lower compared to comparable ADI materials but exhibits a higher ductility, the major disadvantage of...
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Association of the Chemical Engineers of Serbia
2022-01-01
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| Series: | Chemical Industry and Chemical Engineering Quarterly |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/1451-9372/2022/1451-93722100027J.pdf |
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| author | Janjatović Petar D. Erić-Cekić Olivera A. Rajnović Dragan M. Baloš Sebastian S. Grabulov Vencislav K. Šiđanin Leposava P. |
| author_facet | Janjatović Petar D. Erić-Cekić Olivera A. Rajnović Dragan M. Baloš Sebastian S. Grabulov Vencislav K. Šiđanin Leposava P. |
| author_sort | Janjatović Petar D. |
| collection | DOAJ |
| description | Dual-phase ADI material microstructure consists of different amounts and morphologies of ausferrite and free ferrite, obtained by subjecting ductile iron to specific heat treatment. Its strength is lower compared to comparable ADI materials but exhibits a higher ductility, the major disadvantage of ADI. In the current study, an unalloyed ductile iron was intercritical austenitized in two-phase regions (α+Ƴ) at four temperatures from 840 to 780 °C for 2 h and austempered at 400 °C for 1 h to obtain dual-phase ADI with different percentages of free ferrite and ausferrite. Light and scanning electron microscopy was performed for the metallographic and fracture studies, respectively. Microscopy results were correlated to tensile testing results. The results indicated that, as the amount of ausferrite present in the matrix increases, higher values of strength and lower ductility are obtained. The fracture surfaces of dual-phase ADI microstructures with 22.8% of ausferrite in their matrix have regions of quasi-cleavage fracture around last-to-freeze zones, related to the presence of ausferrite in those areas. The specimens with the highest values of ausferrite of 86.8% among the dual-phase microstructure have a dominant quasi-cleavage type of fracture. |
| first_indexed | 2024-04-12T08:19:26Z |
| format | Article |
| id | doaj.art-f8e5a30c0748463c8ff88e6487c8531e |
| institution | Directory Open Access Journal |
| issn | 1451-9372 2217-7434 |
| language | English |
| last_indexed | 2024-04-12T08:19:26Z |
| publishDate | 2022-01-01 |
| publisher | Association of the Chemical Engineers of Serbia |
| record_format | Article |
| series | Chemical Industry and Chemical Engineering Quarterly |
| spelling | doaj.art-f8e5a30c0748463c8ff88e6487c8531e2022-12-22T03:40:41ZengAssociation of the Chemical Engineers of SerbiaChemical Industry and Chemical Engineering Quarterly1451-93722217-74342022-01-0128216116710.2298/CICEQ201222027J1451-93722100027JMicrostructure and fracture mode of unalloyed dual-phase austempered ductile ironJanjatović Petar D.0https://orcid.org/0000-0002-3779-9341Erić-Cekić Olivera A.1https://orcid.org/0000-0002-4702-1728Rajnović Dragan M.2https://orcid.org/0000-0002-5303-4402Baloš Sebastian S.3https://orcid.org/0000-0002-3828-8500Grabulov Vencislav K.4Šiđanin Leposava P.5Department of Production Engineering, Faculty of Technical Science, University of Novi Sad, Novi Sad, SerbiaInnovation Center of Mechanical Engineering Faculty, University of Belgrade, Belgrade, Serbia + Faculty of Mechanical and Civil Engineering, University of Kragujevac, Kraljevo, SerbiaDepartment of Production Engineering, Faculty of Technical Science, University of Novi Sad, Novi Sad, SerbiaDepartment of Production Engineering, Faculty of Technical Science, University of Novi Sad, Novi Sad, SerbiaInstitute for testing of materials-IMS, Belgrade, SerbiaDepartment of Production Engineering, Faculty of Technical Science, University of Novi Sad, Novi Sad, SerbiaDual-phase ADI material microstructure consists of different amounts and morphologies of ausferrite and free ferrite, obtained by subjecting ductile iron to specific heat treatment. Its strength is lower compared to comparable ADI materials but exhibits a higher ductility, the major disadvantage of ADI. In the current study, an unalloyed ductile iron was intercritical austenitized in two-phase regions (α+Ƴ) at four temperatures from 840 to 780 °C for 2 h and austempered at 400 °C for 1 h to obtain dual-phase ADI with different percentages of free ferrite and ausferrite. Light and scanning electron microscopy was performed for the metallographic and fracture studies, respectively. Microscopy results were correlated to tensile testing results. The results indicated that, as the amount of ausferrite present in the matrix increases, higher values of strength and lower ductility are obtained. The fracture surfaces of dual-phase ADI microstructures with 22.8% of ausferrite in their matrix have regions of quasi-cleavage fracture around last-to-freeze zones, related to the presence of ausferrite in those areas. The specimens with the highest values of ausferrite of 86.8% among the dual-phase microstructure have a dominant quasi-cleavage type of fracture.http://www.doiserbia.nb.rs/img/doi/1451-9372/2022/1451-93722100027J.pdfdual matrix structureaustempered ductile ironmicrostructuresurface of fracture |
| spellingShingle | Janjatović Petar D. Erić-Cekić Olivera A. Rajnović Dragan M. Baloš Sebastian S. Grabulov Vencislav K. Šiđanin Leposava P. Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron Chemical Industry and Chemical Engineering Quarterly dual matrix structure austempered ductile iron microstructure surface of fracture |
| title | Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron |
| title_full | Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron |
| title_fullStr | Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron |
| title_full_unstemmed | Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron |
| title_short | Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron |
| title_sort | microstructure and fracture mode of unalloyed dual phase austempered ductile iron |
| topic | dual matrix structure austempered ductile iron microstructure surface of fracture |
| url | http://www.doiserbia.nb.rs/img/doi/1451-9372/2022/1451-93722100027J.pdf |
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