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Microstructure of EK-181 ferritic-martensitic steel after heat treatment under various conditions

A. N. Tyumentsev^a, V. M. Chernov^b, M. V. Leont'eva-Smirnova^b, E. G. Astafurova^a, N. A. Shevyako^c, I. Yu. Litovchenko<sup>a

a</sup> Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, Tomsk
^b Bochvar Russian Scientific Research Institute of Inorganic Materials, Moscow
^c Tomsk State University V.V.Kuibyshev

Abstract: The effect of heat treatment conditions on the microstructure and phase composition of a lowactivated high-temperature ferritic-martensitic EK-181 steel (Fe-12Cr-2W-V-Ta-Ba) is studied. Additional thermal cycling about the austenite-martensite phase transition temperature between quenching and tempering hinders the formation of fine interstitial phases, decreases the phase transformation-induced hardening intensity, retards the formation of a substructure with continuous misorientations, and decreases the brittle-ductile transition temperature.

Received: 12.04.2011

 English version: Technical Physics, 2012, 57:1, 48–54

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