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Tempering behavior of a low nitrogen boron-added 9%Cr steel

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Fedorova,  Irina
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Belgorod State University, 308015 Belgorod, Russia;

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Kostka,  Aleksander
Center for Interface-Dominated High Performance Materials (ZGH), Ruhr-Universität Bochum, 44780 Bochum, Germany;
High-Temperature Materials, External Max Planck Fellow, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Fedorova, I., Kostka, A., Tkachev, E., Belyakov, A., & Kaibyshev, R. (2016). Tempering behavior of a low nitrogen boron-added 9%Cr steel. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 662, 443-455. doi:10.1016/j.msea.2016.03.092.


Cite as: http://hdl.handle.net/21.11116/0000-0001-B976-A
Abstract
The effect of tempering temperature on microstructure and mechanical properties was studied in a low-nitrogen, high-boron, 9Cr steel. After normalizing and low-temperature tempering, cementite platelets precipitated within the martensitic matrix. This phase transformation has no distinct effect on mechanical properties. After tempering at 500 °C, M23C6 carbides appeared in the form of layers and particles with irregular shapes along the high-angle boundaries. Approximately, 6 of the retained austenite was observed after normalizing, which reduced to 2 after tempering at 550 °C. This is accompanied by reduction in toughness from 40 J/cm2 to 8.5 J/cm2. Further increase of the tempering temperature led to spheroidization and coagulation of M23C6 particles that is followed by a significant increase in toughness to 250 J/cm2 at 750 °C. Three-phase separations of M(C,N) carbonitrides to particles enriched with V, Nb and Ti were detected after high-temperature tempering. © 2016 Elsevier B.V.