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Morphology of Proeutectoid Ferrite
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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KTH, Superseded Departments, Materials Science and Engineering.ORCID iD: 0000-0002-7656-9733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, 1425-1443 p.Article in journal (Refereed) Published
Abstract [en]

The morphology of grain boundary nucleated ferrite particles in iron alloys with 0.3 mass pct carbon has been classified according to the presence of facets. Several kinds of particles extend into both grains of austenite and have facets to both. It is proposed that they all belong to a continuous series of shapes. Ferrite plates can nucleate directly on the grain boundary but can also develop from edges on many kinds of particles. Feathery structures of parallel plates on both sides of a grain boundary can thus form. In sections, parallel to their main growth direction, plates have been seen to extend the whole way from the nucleation site at the grain boundary and to the growth front. This happens in the whole temperature range studied from 973 K to 673 K (700 A degrees C to 400 A degrees C). The plates thus grow continuously and not by subunits stopping at limited length and continuing the growth by new ones nucleating. Sometimes, the plates have ridges and in oblique sections they could be mistaken for the start of new plates. No morphological signs were observed indicating a transition between Widmanstatten ferrite and bainitic ferrite. It is proposed that there is only one kind of acicular 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, 1425-1443 p.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-204065DOI: 10.1007/s11661-016-3903-yISI: 000394214300042ScopusID: 2-s2.0-85008477493OAI: oai:DiVA.org:kth-204065DiVA: diva2:1085699
Note

QC 20170330

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

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