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Graphite Formation and Dissolution in Ductile Irons and Steels Having High Silicon Contents: Solid-State Transformations
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Rubin-MaterialteknikLulea, Ausferritic ABVindeln.
JihlavaCzechia.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-3661-9262
2018 (English)In: Metallography, Microstructure, and Analysis, ISSN 2192-9262, Vol. 7, no 5, p. 587-595Article in journal (Refereed) Published
Abstract [en]

Graphite formation in the solid state is both in ductile cast irons and in steels strongly promoted by high silicon contents above 3 wt.% Si. The matrix microstructure in austempered ductile iron can be further refined by secondary graphite if the austenitization, quench, and isothermal transformation into ausferrite are preceded by an austenitization at a slightly higher temperature followed by quench to martensite, resulting in higher carbon content than being soluble at the second austenitization temperature. Hypoeutectoid steels with high silicon contents can be rapidly graphitized, causing recrystallization of surrounding ferrite due to plastic deformation making room for less dense graphite. In rolled steels, the interface between manganese sulfide and steel matrix is the most common nucleation site. Voids are formed when graphite is partly or completely dissolved during austenitization in succeeding hardening heat treatments, but the mechanical properties can still be good if the graphite particles dissolved into voids are below 20 µm. Graphitized Si-solution strengthened ferritic steels may perform similar to free-cutting steels but with improved mechanical properties.

Place, publisher, year, edition, pages
New York: Springer, 2018. Vol. 7, no 5, p. 587-595
Keywords [en]
Graphitization High silicon iron High silicon steel Machinability Void formation Ausferrite
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-71155DOI: 10.1007/s13632-018-0478-6ISI: 000446639500008Scopus ID: 2-s2.0-85054302639OAI: oai:DiVA.org:ltu-71155DiVA, id: diva2:1254456
Note

Validerad;2018;Nivå 2;2018-10-09 (inah)

Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2019-04-24Bibliographically approved

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Rubin, PerAntti, Marta-Lena

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