Effect of High Temperature Thermomechanical Treatment on the Tendency of Low-Activation 12% Cr Ferritic-Martensitic Steel EK-181 to Low-Temperature Embrittlement

• Published in: Russian physics journal Vol. 64; no. 12; pp. 2225 - 2231
• Main Authors: Polekhina, N. A., Linnik, V. V., Almaeva, K. V., Litovchenko, I. Yu, Tymentsev, A. N., Moskvichev, E. N., Chernov, V. M., Leontyeva-Smirnova, M. V., Degtyarev, N. A., Moroz, K. A.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-04-2022; Springer; Springer Nature B.V
• Subjects: Analysis; Chromium; Condensed Matter Physics; Deformation effects; Dual phase steels; Ductile-brittle transition; Dynamic tests; Embrittlement; Ferritic stainless steels; Hadrons; Heat treatment; Heavy Ions; High temperature effects; Hot rolling; Impact strength; Lasers; Low temperature; Martensitic stainless steels; Mathematical and Computational Physics; Mechanical properties; Nuclear Physics; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Static tests; Steel; Tensile strength; Theoretical; Thermomechanical treatment; ferritic-martensitic steel; strength; impact toughness; high-temperature thermomechanical treatment; ductile-brittle transition temperature; plasticity; fractography; low-activation steel
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-022-02581-w

The effect of high-temperature thermomechanical treatment (HTMT) with deformation in the austenitic region on the regularities of low-temperature embrittlement of low-activation 12% chromium ferritic-martensitic steel EK-181 is investigated in comparison with traditional heat treatment (THT) during dynamic tests on impact toughness and static tests on uniaxial tension in the range from −196 to 20°C. It is found out that HTMT increases both the tensile strength properties of steel and its impact toughness. At the same time, the temperature of its ductile-brittle transition does not practically change relative to the THT. It is observed that the features of steel microstructure after HTMT, the formation of delaminations (during fracture of Charpy-type specimens) in the planes parallel to the plane of hot rolling, have a positive effect on its impact toughness.