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The role of primary austenite morphology in hypoeutectic compacted graphite iron alloys
Jönköping University, Tekniska Högskolan, JTH, Material och tillverkning.ORCID-id: 0000-0002-6339-4292
Scania CV AB, Södertälje, Sweden.
Jönköping University, Tekniska Högskolan, JTH, Material och tillverkning.ORCID-id: 0000-0002-7527-719X
Jönköping University, Tekniska Högskolan, JTH, Material och tillverkning.ORCID-id: 0000-0002-3184-7592
Vise andre og tillknytning
2020 (engelsk)Inngår i: International Journal of metalcasting, ISSN 1939-5981, E-ISSN 2163-3193Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
Abstract [en]

This work investigates the role of primary austenite morphology on the eutectic and eutectoid microstructures and the ultimate tensile strength (UTS) in a hypoeutectic compacted graphite iron (CGI) alloy. The morphology of primary austenite is modified by isothermal coarsening experiments in which holding times up to 60 min are applied to the solid–liquid region after coherency. The cooling conditions for the subsequent eutectic and eutectoid reactions are similar. Miniaturized tensile tests are performed to evaluate the UTS. The morphological characteristics related to the surface area of primary austenite, the modulus of primary austenite, Mγ, and the hydraulic diameter of the interdendritic region, DHydID, increase with the cube root of coarsening time. The eutectic and eutectoid microstructures are not significantly affected by the morphology of primary austenite, thus indicating that the morphology of the interdendritic regions does not control the nucleation frequency and growth of eutectic cells or graphite. UTS decreases linearly with the increasing coarseness of primary austenite for similar eutectic and eutectoid microstructures, demonstrating the strong influence of primary austenite morphology on the UTS in hypoeutectic CGI alloys.

sted, utgiver, år, opplag, sider
Springer, 2020.
Emneord [en]
cast iron, compacted graphite iron, CGI, solidification, dendrites, primary austenite, UTS
HSV kategori
Identifikatorer
URN: urn:nbn:se:hj:diva-47569DOI: 10.1007/s40962-020-00410-9ISI: 000515610600001Scopus ID: 2-s2.0-85078435803OAI: oai:DiVA.org:hj-47569DiVA, id: diva2:1388976
Forskningsfinansiär
Vinnova, 2013-03303Knowledge Foundation, 2018-0033
Merknad

This paper is an invited submission to IJMC selected from presentations at the 2nd Carl Loper 2019 Cast Iron Symposium held September 30 to October 1, 2019, in Bilbao, Spain.

Tilgjengelig fra: 2020-01-28 Laget: 2020-01-28 Sist oppdatert: 2020-03-18

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Hernando, Juan CarlosGhassemali, EhsanDahle, ArneDiószegi, Attila

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