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Massive transformation in the Fe-Ni system
KTH, Superseded Departments, Materials Science and Engineering.ORCID iD: 0000-0002-7656-9733
2000 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 48, no 11, 2765-2775 p.Article in journal (Refereed) Published
Abstract [en]

The critical limit for the massive gamma-->alpha transformation in the Fe-Ni system has been measured by isothermal heat treatment of diffusion couples. The position of the alpha/gamma interface at the end of the treatment could be identified but some growth occurred during the quench. Growth is probably hindered at the beginning of the quench by a redistribution of Fe and Ni at the interface during the isothermal treatment. During the quench it often happens that the alpha/gamma interfaces develop jagged shapes and even very fine plates although there should usually be no orientation relationship. The critical limit agrees fairly well with classical results for the formation of equiaxed ferrite from continuous cooling of homogeneous specimens. At 1023 K it coincides with the alpha/alpha + gamma phase boundary. At lower temperatures it moves inside the alpha + gamma two-phase field. The driving force for the massive transformation increases at decreasing temperature and the limiting composition never approaches the T-0 line.

Place, publisher, year, edition, pages
2000. Vol. 48, no 11, 2765-2775 p.
Keyword [en]
massive transformation, microstructure, thermodynamics, iron alloys, interface, solute drag, thermodynamics, kinetics, growth, alloys, ferrite
Identifiers
URN: urn:nbn:se:kth:diva-20023ISI: 000089196700001OAI: oai:DiVA.org:kth-20023DiVA: diva2:338716
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Borgenstam, Annika

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