The Changes in Structure of Steel P91 after Short Annealings

0448374 - ÚFM 2016 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Král, Lubomír - Čermák, Jiří - Král, Petr
The Changes in Structure of Steel P91 after Short Annealings.
Metal 2015: 24th International Conference on Metallurgy and Materials. Ostrava: TANGER Ltd, 2015. ISBN 978-80-87294-58-1.
[METAL 2015 - International Conference on Metallurgy and Materials /24./. Brno (CZ), 03.06.2015-05.06.2015]
Grant CEP: GA MŠMT(CZ) ED1.1.00/02.0068; GA MŠMT(CZ) EE2.3.20.0214
Institucionální podpora: RVO:68081723
Klíčová slova: P91 * carbides * carbon * precipitation
Kód oboru RIV: BJ - Termodynamika

Phase composition of the steel P91 during annealing was studied with the aim to reveal the evolution of new phases. In this paper, the precipitation was characterized using energy-dispersive X-ray spectroscopy (EDS) and electron diffraction in transmission microscopy (TEM). Only Nb-rich particles were found in the studied samples austenitized at 1423 °C for 20h and water cooled. After tempering at 673 °C for 2 h, the formation mainly M3C type carbides and after tempering at 873 °C for 2 h, the formation of M7C3 and M23C6 was observed. These structure changes play an important role for stability and also carbon diffusion.
Trvalý link: http://hdl.handle.net/11104/0250486