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The extent and mechanism of nanostructure formation during cold rolling and aging of lath martensite in alloy steel

Nedjad, S. Hossein and Ahmadabadi, M. Nili and Furuhara, T. (2008) The extent and mechanism of nanostructure formation during cold rolling and aging of lath martensite in alloy steel. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 485 (1-2). pp. 544-549.

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Official URL: http://www.sciencedirect.com/science?_ob=ArticleUR...

Abstract

Transmission electron microscopy was used to study microstructural evolutions during cold rolling and isothermal aging of an Fe-100Ni-7Mn (wt.%) maraging steel at 753 K. The steel shows lath martensite after homogenizing treatment which evolved by cold rolling to a typical deformed structure, consisting of lamellar dislocation boundaries and shear bands. Ultrafine-grained regions were found frequently in the isothermally aged steels. The process of ultrafine grain formation during isothermal aging is attributed to extended recovery to be correlated with precipitate coarsening reactions. At later stages of aging, recrystallization-assisted discontinuous coarsening of grain boundary precipitates was identified at lamellar boundaries, giving rise to a banded structure consisting of ferrite bands and precipitation hardened laths. It was demonstrated that partially-nanostructured multi-phase steel is fabricated by cold rolling and aging of lath martensite. (C) 2007 Elsevier B.V. All rights reserved.

Item Type:Article
Uncontrolled Keywords:nanostructure; cold rolling; lath martensite; extended recovery; discontinuous recrystallization
Subjects:Material Science > Functional and hybrid materials
ID Code:6065
Deposited By:IoN
Deposited On:03 Sep 2009 17:10
Last Modified:03 Sep 2009 17:10

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