Martensite Transformation Intergrain and Intragrain Autocatalysis in Fe-Ni alloys
This work presents a consolidated view of the autocatalysis, thermal and entropic effects in martensitic transformation of polycrystalline Fe-31wt%Ni-0.02wt%C, which has been a standard material for the investigation of fundamental aspects of the martensite transformation. The present work is based on the description of classical microstructure descriptors of the transformation and on generally accepted concepts regarding the martensitic transformation in iron base alloys. Present work agrees with the view that the autocatalysis is a means by which the martensite transformation promotes further nucleation and growth. Autocatalysis induces the nucleation and growth of secondary plates in addition to the relatively small number of primary nucleation sites and their corresponding primary plates. We demonstrate that autocatalysis can be factored out into intragrain and intergrain components. The analysis of these factors establishes that intragrain autocatalysis is athermal but intergrain autocatalysis possess an Arrhenius temperature dependence. The reasons for such a behavior are discussed in detail.
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2017
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oai:scielo:S1516-143920170006015482018-05-18Martensite Transformation Intergrain and Intragrain Autocatalysis in Fe-Ni alloysGuimarães,José Roberto CostaRios,Paulo Rangel metals and alloys microstructure martensite transformation iron-nickel alloys autocatalysis This work presents a consolidated view of the autocatalysis, thermal and entropic effects in martensitic transformation of polycrystalline Fe-31wt%Ni-0.02wt%C, which has been a standard material for the investigation of fundamental aspects of the martensite transformation. The present work is based on the description of classical microstructure descriptors of the transformation and on generally accepted concepts regarding the martensitic transformation in iron base alloys. Present work agrees with the view that the autocatalysis is a means by which the martensite transformation promotes further nucleation and growth. Autocatalysis induces the nucleation and growth of secondary plates in addition to the relatively small number of primary nucleation sites and their corresponding primary plates. We demonstrate that autocatalysis can be factored out into intragrain and intergrain components. The analysis of these factors establishes that intragrain autocatalysis is athermal but intergrain autocatalysis possess an Arrhenius temperature dependence. The reasons for such a behavior are discussed in detail.info:eu-repo/semantics/openAccessABM, ABC, ABPolMaterials Research v.20 n.6 20172017-12-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000601548en10.1590/1980-5373-mr-2016-0880 |
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Guimarães,José Roberto Costa Rios,Paulo Rangel |
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Guimarães,José Roberto Costa Rios,Paulo Rangel Martensite Transformation Intergrain and Intragrain Autocatalysis in Fe-Ni alloys |
author_facet |
Guimarães,José Roberto Costa Rios,Paulo Rangel |
author_sort |
Guimarães,José Roberto Costa |
title |
Martensite Transformation Intergrain and Intragrain Autocatalysis in Fe-Ni alloys |
title_short |
Martensite Transformation Intergrain and Intragrain Autocatalysis in Fe-Ni alloys |
title_full |
Martensite Transformation Intergrain and Intragrain Autocatalysis in Fe-Ni alloys |
title_fullStr |
Martensite Transformation Intergrain and Intragrain Autocatalysis in Fe-Ni alloys |
title_full_unstemmed |
Martensite Transformation Intergrain and Intragrain Autocatalysis in Fe-Ni alloys |
title_sort |
martensite transformation intergrain and intragrain autocatalysis in fe-ni alloys |
description |
This work presents a consolidated view of the autocatalysis, thermal and entropic effects in martensitic transformation of polycrystalline Fe-31wt%Ni-0.02wt%C, which has been a standard material for the investigation of fundamental aspects of the martensite transformation. The present work is based on the description of classical microstructure descriptors of the transformation and on generally accepted concepts regarding the martensitic transformation in iron base alloys. Present work agrees with the view that the autocatalysis is a means by which the martensite transformation promotes further nucleation and growth. Autocatalysis induces the nucleation and growth of secondary plates in addition to the relatively small number of primary nucleation sites and their corresponding primary plates. We demonstrate that autocatalysis can be factored out into intragrain and intergrain components. The analysis of these factors establishes that intragrain autocatalysis is athermal but intergrain autocatalysis possess an Arrhenius temperature dependence. The reasons for such a behavior are discussed in detail. |
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ABM, ABC, ABPol |
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2017 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000601548 |
work_keys_str_mv |
AT guimaraesjoserobertocosta martensitetransformationintergrainandintragrainautocatalysisinfenialloys AT riospaulorangel martensitetransformationintergrainandintragrainautocatalysisinfenialloys |
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1756420752167403520 |