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Austempered compacted graphite iron — Influence of austempering temperature and time on microstructural and mechanical properties
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0003-2698-5445
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
Bodycote Gothenburg, Gothenburg, Sweden.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-3024-9005
2019 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 767, article id 138434Article in journal (Refereed) Published
Abstract [en]

This study investigates the effect of austempering temperature and time on the microstructural and mechanical properties of unalloyed Compacted Graphite Iron (CGI) with an initially ferritic matrix structure. The as-cast CGI samples were first austenitised at 900 °C for 60 min in a furnace, then austempered in a closed salt bath at three austempering temperatures – 275, 325, and 375 °C – for different times; 30, 60, 90, and 120 min. Tensile properties, Brinell, Vickers and Rockwell C hardness values were evaluated for the as-cast and austempered CGI ones. LOM and SEM, EBSD analysis techniques were used for microstructure and phase analysis. A mixture of acicular ferrite and retained austenite was achieved in the austempered CGI samples. In general, a decrease in austempering temperature resulted in a decrease in retained austenite content, corresponding improvements in hardness and tensile strength, and a decrease in elongation values.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 767, article id 138434
Keywords [en]
Austenitising, Austempered CGI, Ausferrite matrix, Retained austenite, Mechanical properties, EBSD
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-46357DOI: 10.1016/j.msea.2019.138434ISI: 000494052200036Scopus ID: 2-s2.0-85072385523Local ID: PP JTH 2019 embargo 24OAI: oai:DiVA.org:hj-46357DiVA, id: diva2:1354517
Available from: 2019-09-25 Created: 2019-09-25 Last updated: 2019-11-20Bibliographically approved

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The full text will be freely available from 2021-09-19 00:00
Available from 2021-09-19 00:00

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Ghasemi, RohollahDiószegi, Attila

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