Atomic Resolution Microscopy of Nitrides in Steel

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    Abstract

    MN and CrMN type nitride precipitates in 12%Cr steels have been investigated using atomic resolution microscopy. The MN type nitrides were observed to transform into CrMN both by composition and crystallography as Cr diffuses from the matrix into the MN precipitates. Thus a change from one precipitate type to another does not necessarily involve nucleation of the new precipitate type followed by dissolution of the old precipitates. By studying the interface between these nitrides and the matrix, it could be observed that the MN and CrMN type precipitates had a few nanometers thick amorphous layer between the crystalline nitride and ferrite matrix. Usually precipitates are described as having (semi) coherent or incoherent interfaces, but in this case it is more energetically favourable to create an amorphous layer instead of the incoherent interface.
    Original languageEnglish
    JournalMaterials Science Forum
    Volume783-786
    Pages (from-to)1617-1622
    ISSN0255-5476
    DOIs
    Publication statusPublished - 2014
    EventThermec 2013 - International Conference on Processing & Manufacturing of Advanced Materials: Processing, Fabrication, Properties, Application - Las Vegas, United States
    Duration: 2 Dec 20136 Dec 2013
    http://www.thermec.org/template3s/index-org.php

    Conference

    ConferenceThermec 2013 - International Conference on Processing & Manufacturing of Advanced Materials
    Country/TerritoryUnited States
    CityLas Vegas
    Period02/12/201306/12/2013
    Internet address

    Keywords

    • Precipitate Transformation
    • Amorphous Interfaces

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