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Second Stage of Upper Bainite in a 0.3 Mass Pct C Steel
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-2766-976X
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, Superseded Departments, Materials Science and Engineering.ORCID iD: 0000-0002-7656-9733
2017 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 48A, no 3, 1444-1458 p.Article in journal (Refereed) Published
Abstract [en]

Upper bainite forms in at least two stages, the formation of parallel plates of ferrite and the transformation of the interspaces to a mixture of cementite and ferrite. The first stage was examined in a preceding metallographic study of the formation of ferrite in hypoeutectoid steels and the second stage, which is initiated by the occurrence of cementite in the interspaces, is the subject of the present study. The alloy from the preceding study will also be used here. The band of austenite in the interspaces between parallel plates is generally transformed by a degenerate eutectoid transformation when this band is thin. When it is thicker, it will transform by a more cooperative growth mechanism and result in a eutectoid colony, often with cementite platelets. A series of sketches are presented which illustrate in detail how the second stage of upper bainite progresses according to the present observations. The cooperative manner did not increase as the temperature was lowered because the tendency to form plates of ferrite was still increasing at lower temperatures, making the interspaces too narrow for the cooperative reaction to dominate over the formation of fine plates of ferrite. (C) The Author(s) 2016. This article is published with open access at Springerlink.com

Place, publisher, year, edition, pages
Springer, 2017. Vol. 48A, no 3, 1444-1458 p.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-204066DOI: 10.1007/s11661-016-3902-zISI: 000394214300043ScopusID: 2-s2.0-85008511996OAI: oai:DiVA.org:kth-204066DiVA: diva2:1085701
Note

QC 20170330

Available from: 2017-03-30 Created: 2017-03-30 Last updated: 2017-03-30Bibliographically approved

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