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Open AccessArticle

Effects of the Tempering and High-Pressure Torsion Temperatures on Microstructure of Ferritic/Martensitic Steel Grade 91

1
Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa 450008, Russia
2
Department of Mining and Nuclear Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
3
Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
*
Author to whom correspondence should be addressed.
Materials 2018, 11(4), 627; https://doi.org/10.3390/ma11040627
Received: 22 March 2018 / Revised: 16 April 2018 / Accepted: 16 April 2018 / Published: 19 April 2018
(This article belongs to the Special Issue Dynamic Recrystallization and Microstructural Evolution in Alloys)
Grade 91 (9Cr-1Mo) steel was subjected to various heat treatments and then to high-pressure torsion (HPT) at different temperatures. Its microstructure was studied using transmission electron microscopy (TEM) and X-ray diffraction (XRD). Effects of the tempering temperature and the HPT temperature on the microstructural features and microhardness in the ultrafine-grained (UFG) Grade 91 steel were researched. The study of the UFG structure formation takes into account two different microstructures observed: before HPT in both samples containing martensite and in fully ferritic samples. View Full-Text
Keywords: ferritic/martensitic steel; high-pressure torsion; ultrafine-grained structure ferritic/martensitic steel; high-pressure torsion; ultrafine-grained structure
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Ganeev, A.; Nikitina, M.; Sitdikov, V.; Islamgaliev, R.; Hoffman, A.; Wen, H. Effects of the Tempering and High-Pressure Torsion Temperatures on Microstructure of Ferritic/Martensitic Steel Grade 91. Materials 2018, 11, 627.

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