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Journal of Materials Engineering and Performance

Erschienen in:

13.05.2016

Characterization of Carbon-Rich Phases in a Complex Microstructure of a Commercial X80 Pipeline Steel

verfasst von: E. V. Morales, I. S. Bott, R. A. Silva, A. M. Morales, L. F. G. de Souza

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 7/2016

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Abstract

The wide use of the term M/A constituent conceals many complexities about shape, size, and composition. This work uses metallographic techniques and transmission electron microscopy to characterize the entire microstructure development which is observed during continuous cooling in a commercial X80 pipeline steel. A general model is presented which allows calculating the volume fractions of martensite and retained austenite, as well as their compositions in these carbon-rich phases of the M/A constituent for this commercial pipeline steel. This approach takes into account the allotriomorphic ferrite formation and the massive alloyed carbide precipitation before the acicular ferrite formation. Two morphologies (in the film and blocky forms) of the M/A constituent were registered. The calculated M/A volume fraction resulted in agreement with the fraction of this constituent experimentally obtained through the optical microscopy observations. This allowed the justification of the very small volumetric fraction of the M/A constituent with the film morphology.

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Titel: Characterization of Carbon-Rich Phases in a Complex Microstructure of a Commercial X80 Pipeline Steel
verfasst von: E. V. Morales
I. S. Bott
R. A. Silva
A. M. Morales
L. F. G. de Souza
Publikationsdatum: 13.05.2016
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 7/2016
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-016-2119-z

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