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Understanding Hot vs. Cold Rolled Medium Manganese Steel Deformation Behavior Using In Situ Microscopic Digital Image Correlation

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Abstract:

We address the differences in yield stresses between hot and cold rolled medium manganese steel showing continuous yielding. Continuous yielding in both, the hot and cold rolled samples were resulting from reverted austenite islands plastically deforming first and less strain in the tempered martensite matrix. At higher global strains, strain was taken up not only by the reverted austenite, but also by tempered martensite and fresh martensite formed from the austenite through martensitic phase transformation during deformation. Strain localization was also observed in the hot rolled samples. This localization is caused by cumulative deformation of colonies of lamellar reverted austenite islands. It is interpreted in terms of the spatial alignment of austenite colonies to the loading direction in addition to the crystallographic orientation.

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Periodical:

Materials Science Forum (Volume 941)

Pages:

198-205

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.941.198

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Online since:

December 2018

Authors:

Aniruddha Dutta, Dirk Ponge*, Stefanie Sandlöbes, Dierk Raabe

Keywords:

DIC, EBSD, In Situ, Medium Manganese Steel, Microscopic-Digital Image Correlation, Strain Localization, Strain Partitioning

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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