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Título: | Effect of Ausforming Temperature on the Microstructure of G91 Steel |
Autor: | Vivas, Javier; Capdevila, Carlos CSIC ORCID ; Jiménez, José Antonio CSIC ORCID ; Benito-Alfonso, Miguel; San-Martín, David CSIC ORCID | Fecha de publicación: | 27-jun-2017 | Editor: | Multidisciplinary Digital Publishing Institute | Citación: | Metals 7 (7): 236 (2017) | Resumen: | The development of thermomechanical treatments (TMT) has a high potential for improving creep-strength in 9Cr-1Mo ferritic/martensitic steel (ASTM T/P91) to operate at temperatures beyond 600 °C. To maximize the number of nanoscale MX precipitates, an ausforming procedure has been used to increase the number of nucleation sites for precipitation inside the martensite lath. Relative to standard heat treatments (consisting of austenitization at about 1040 °C followed by tempering at about 730 °C) this processing concept has enabled achieving a microstructure containing approximately three orders of magnitude higher number density of MX precipitates having a size around four times smaller in ASTM T/P91 steel. On the other hand; this TMT has little effect on the size and number density of M<sub>23</sub>C<sub>6</sub> particles. The optimized microstructure produced by this TMT route proposed is expected to improve the creep strength of this steel. | Versión del editor: | http://doi.org/10.3390/met7070236 | URI: | http://hdl.handle.net/10261/153586 | DOI: | 10.3390/met7070236 | Identificadores: | doi: 10.3390/met7070236 |
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