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Morphology of Upper and Lower Bainite with 0.7 Mass Pct C
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.ORCID-id: 0000-0003-2766-976X
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.ORCID-id: 0000-0002-7656-9733
2017 (engelsk)Inngår i: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 48, nr 9, s. 4006-4024Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

There has been an on-going discussion on the difference in formation mechanisms of upper and lower bainite. Various suggestions have been supported by reference to observed morphologies and illustrated with idealized sketches of morphologies. In order to obtain a better basis for discussions about the difference in mechanism, the morphology of bainite in an Fe-C alloy with 0.7 mass pct carbon was now studied in some detail from 823 K to 548 K (550 °C to 275 °C) at temperature intervals of 50 K or less. The work focused on bainite seen to start from a grain boundary in the plane of polish and showing an advancing tip in the remaining austenite. The results indicate that there is no essential difference with temperature regarding the ferritic skeleton of feathery bainite. The second stage of bainite formation, which involves the formation of both ferrite and cementite, was regarded as a eutectoid transformation and the resulting morphologies were analyzed in terms of two modes, degenerate and cooperative eutectoid transformation. There was no sharp difference between upper and lower bainite. Ways to define the difference were discussed.

sted, utgiver, år, opplag, sider
Springer, 2017. Vol. 48, nr 9, s. 4006-4024
Emneord [en]
Bainite, Carbides, Carbon, Ferrite, Grain boundaries, Iron alloys, Morphology
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Identifikatorer
URN: urn:nbn:se:kth:diva-212242DOI: 10.1007/s11661-017-4208-5ISI: 000406486700009Scopus ID: 2-s2.0-85022045731OAI: oai:DiVA.org:kth-212242DiVA, id: diva2:1134026
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VINNOVA
Merknad

QC 20170817

Tilgjengelig fra: 2017-08-17 Laget: 2017-08-17 Sist oppdatert: 2017-08-28bibliografisk kontrollert

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