MICROSTRUCTURE REFINEMENT IN MARTENSITIC CREEP RESISTANT STEEL VIA SEVERE PLASTIC DEFORMATION

1 KRAL Petr
Co-authors:
1 DVORAK Jiri 1 SKLENICKA Vaclav 2,3,4 TAKIZAWAA Yoichi 2,3 MASUDA Takahiro 2,3 HORITA Zenji 1 KUCHAROVA Kveta 1 KVAPILOVA Marie 5 SVOBODOVA Marie
Institutions:
1 Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 22, 616 62 Brno, Czech Republic
2 Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
3 WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan
4 Technology Department, Nagano Forging Co., Ltd, Nagano 380-0003, Japan
5 UJP PRAHA a.s., 156 10 Praha-Zbraslav, Czech Republic
Conference:
10th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 17th - 19th 2018
Proceedings:
Proceedings 10th International Conference on Nanomaterials - Research & Application
Pages:
597-602
ISBN:
978-80-87294-89-5
ISSN:
2694-930X
Published:
28th February 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
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Abstract

In this study, the effect of severe plastic deformation on grain size refinement and mechanical properties of a coarse-grained steel was investigated. The experimental material used in the present investigation was advanced tungsten modified 9%Cr P92 steel. The coarse-grained state of P92 steel was deformed at room temperature by high-pressure sliding or high-pressure torsion. The microstructure was investigated using Tescan Lyra 3 scanning electron microscope equipped with an electron-back scatter unit. Severe plastic deformation at room temperature led to grain size reduction down to sub-microscopic level. The grain size and hardness exhibited significant changes to the equivalent strain of about 10, and slight changes between the equivalent strains of 10 – 20. Equivalent plastic strains higher than 20 only led to insignificant changes in the mean grain size and hardness. The creep behaviour of the ultrafine-grained state exhibited the minimum creep rate of about two orders of magnitude greater when compared to the coarse-grained P92 steel.

Keywords: Steel, ultra-fine grained materials, creep, electron back scatter diffraction
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