Characterization of Carbon-Rich Phases in a Complex Microstructure of a Commercial X80 Pipeline Steel
| Autor: | L. F. G. de Souza, Ivani de Souza Bott, E. V. Morales, Rossano Silva, A. M. Morales |
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| Rok vydání: | 2016 |
| Předmět: |
Austenite
Materials science 020502 materials Mechanical Engineering Metallurgy 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure Acicular ferrite Carbide 0205 materials engineering Mechanics of Materials Ferrite (iron) Martensite Diffusionless transformation Volume fraction General Materials Science 0210 nano-technology |
| Zdroj: | Journal of Materials Engineering and Performance. 25:2736-2745 |
| ISSN: | 1544-1024 1059-9495 |
| DOI: | 10.1007/s11665-016-2119-z |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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