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Chemical Industry and Chemical Engineering QuarterlyVolume 28, Issue 2, 4 May 2022, Pages 161-167

MICROSTRUCTURE AND FRACTURE MODE OF UNALLOYED DUAL-PHASE AUSTEMPERED DUCTILE IRON(Article)(Open Access)

[MIKROSTRUKTURA I MORFOLOGIJA LOMA NELEGIRANOG DVOFAZNOG AUSTEMPEROVANOG NODULARNOG LIVA]

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  • aDepartment of Production Engineering, Faculty of Technical Science, University of Novi Sad, Novi Sad, Serbia
  • bInnovation Center of Mechanical Engineering Faculty, University of Belgrade, Belgrade, Serbia
  • cFaculty of Mechanical and Civil Engineering, University of Kragujevac, Kraljevo, Serbia
  • dInstitute for testing of materials-IMS, Belgrade, Serbia

Abstract

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. © 2022, CI and CEQ. All rights reserved.

Author keywords

austempered ductile irondual matrix structuremicrostructuresurface of fracture

Funding details

Funding sponsor Funding number Acronym
Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja200156,451-03-68/2020-14/200213,451-03-68/2020-14/200156MPNTR

  • 1

    This paper has been supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia through project no. 451-03-68/2020-14/200156: \u201CInnovative scientific and artistic research from the Faculty of Technical Sciences, Novi Sad, Serbia, activity domain\u201D and project no. 451-03-68/2020-14/200213, Innovation Centre of Mechanical Engineering Faculty, University of Belgrade, Belgrade, Serbia.

  • ISSN: 14519372
  • Source Type: Journal
  • Original language: English
  • DOI: 10.2298/CICEQ201222027J
  • Document Type: Article
  • Publisher: CI and CEQ

  Erić Cekić, O.A.; Innovation Center of Mechanical Engineering Faculty, University of Belgrade, Belgrade, Serbia;
© Copyright 2022 Elsevier B.V., All rights reserved.

Cited by 1 document

Sabzalipour, M. , Rashidi, A.M.
Machinability of martensitic and austempered ductile irons with dual matrix structure
(2023) Journal of Materials Research and Technology
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