Effect of Tempering on Phase Transformations in Low-Alloy Steel with 1.6%Si

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Abstract

Low temperature tempering of a 0.53%C–1.6%Si–0.9%Mn–0.76%Cr–0.14%V–0.05%Nb steel provides combination of high yield stress σ0.2=1890 MPa with elongation-to-failure δ=6% and Charpy V-notch (CVN) impact energy of 11 J/cm2 due to precipitation of non-stoichiometric η-carbide Fe2C. Silicon suppresses precipitation of para-equilibrium cementite both from martensite and retained austenite. Orthoequilibrium cementite precipitate upon tempering at 500°С providing combination of σ0.2=1360 MPa with δ=9% and CVN impact energy of 18 J/cm2.

About the authors

V. A. Dudko

Russian State Agrarian University – Moscow Timiryazev Agricultural Academy; Belgorod State University

Author for correspondence.
Email: dudko@bsu.edu.ru
Russian Federation, Moscow; Belgorod

D. Yu. Yuzbekova

Russian State Agrarian University – Moscow Timiryazev Agricultural Academy; Belgorod State University

Email: dudko@bsu.edu.ru
Russian Federation, Moscow; Belgorod

M. N. Erokhin

Russian State Agrarian University – Moscow Timiryazev Agricultural Academy

Email: dudko@bsu.edu.ru

Academician of the RAS

Russian Federation, Moscow

S. M. Gaidar

Russian State Agrarian University – Moscow Timiryazev Agricultural Academy

Email: dudko@bsu.edu.ru
Russian Federation, Moscow

R. O. Kaibyshev

Russian State Agrarian University – Moscow Timiryazev Agricultural Academy

Email: dudko@bsu.edu.ru
Russian Federation, Moscow

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