Open AccessEFFECT OF SEVERE PLASTIC DEFORMATION ON RADIATION HARDENING OF T91 FERRITIC-MARTENSITIC STEEL
Author(s) -
V.N. Voyevodin,
G.D. Tolstolutskaya,
S.A. Karpov,
A.N. Velikodnyi,
М.А. Tikhonovsky,
А.S. Kalchenko,
G.N. Tolmachova,
Р.Л. Василенко,
I.E. Kopanets
Publication year - 2021
Publication title -
problems of atomic science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.216
H-Index - 17
eISSN - 1562-6016
pISSN - 1682-9344
DOI - 10.46813/2021-132-035
Subject(s) - materials science , microstructure , hardening (computing) , martensite , nanoindentation , irradiation , carbide , dislocation , metallurgy , severe plastic deformation , transmission electron microscopy , lath , composite material , physics , layer (electronics) , nuclear physics , nanotechnology
Effect of thermomechanical treatment on radiation hardening behavior in T91 ferritic-martensitic steel was evaluated. An applying of severe plastic deformation (SPD) by the “upsetting-extrusion” method and subsequent heat treatment led to a considerable grain refinement, crushing of martensite lamellas, reduction of MX carbides size and their more uniform distribution. Nanoindentation measurements of SPD-modified steel revealed a 1.4-fold increase in the hardness relative to the initial steel. Irradiation response of modified steel was examined after 1.4 MeV Ar+ ion irradiations in the dose range of 10…45 displacements per atom (dpa) at room temperature and 460 °C. Microstructure characterization was performed by means of transmission electron microscopy (TEM). It was found that dislocation loops and nano-sized argon bubbles dominated the damage microstructure after ion irradiation. The effects of SPD-induced transformations as well as nano-bubbles formation are discussed regarding to the hardening phenomenon observed in irradiated steel.