The effect of predeformation on creep strength of 9% cr steel

Král P, Dvořák J, Blum W, Sklenička V, Horita Z, Takizawa Y, Tang Y, Kunčická L, Kocich R, Kvapilová M, Svobodová M (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Materials MDPI

Book Volume: 13

Pages Range: 1-17

Article Number: 5330

Journal Issue: 23

DOI: 10.3390/ma13235330

Abstract

Martensitic creep-resistant P92 steel was deformed by different methods of severe plastic deformation such as rotation swaging, high-pressure sliding, and high-pressure torsion at room temperature. These methods imposed significantly different equivalent plastic strains of about 1–30. It was found that rotation swaging led to formation of heterogeneous microstructures with elongated grains where low-angle grain boundaries predominated. Other methods led to formation of ultrafine-grained (UFG) microstructures with high frequency of high-angle grain boundaries. Constant load tensile creep tests at 873 K and initial stresses in the range of 50 to 300 MPa revealed that the specimens processed by rotation swaging exhibited one order of magnitude lower minimum creep rate compared to standard P92 steel. By contrast, UFG P92 steel is significantly softer than standard P92 steel, but differences in their strengths decrease with increasing stress. Microstructural results suggest that creep behavior of P92 steel processed by severe plastic deformation is influenced by the frequency of high-angle grain boundaries and grain coarsening during creep.

Authors with CRIS profile

Wolfgang Blum Technische Fakultät

Involved external institutions

Academy of Sciences of the Czech Republic (ASCR) / Akademie věd České republiky (AVČR) CZ Czech Republic (CZ) Nagano Forging Co., Ltd. / 長野鍛工株式会社 JP Japan (JP) Kyushu University / 九州大学 JP Japan (JP) Technical University of Ostrava / Vysoká škola báňská - Technická univerzita Ostrava CZ Czech Republic (CZ) UJP PRAHA a.s. CZ Czech Republic (CZ) Kyushu Institute of Technology JP Japan (JP)

How to cite

APA:

Král, P., Dvořák, J., Blum, W., Sklenička, V., Horita, Z., Takizawa, Y.,... Svobodová, M. (2020). The effect of predeformation on creep strength of 9% cr steel. Materials, 13(23), 1-17. https://doi.org/10.3390/ma13235330

MLA:

Král, Petr, et al. "The effect of predeformation on creep strength of 9% cr steel." Materials 13.23 (2020): 1-17.

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