Influence of oxide and intermetallide ageing on the structure and mechanical properties of high-alloy structural steels

Europe/Rome
AulaTouschek (Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati)

AulaTouschek

Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati

Via Enrico Fermi 40 00044 Frascati
Description
ABSTRACT

In this presentation we discuss the influence of oxide and intermetallide ageing on the structure and mechanical properties of high-alloy structural steels. The principal attention is given to recently created steels strengthened with heat-resistant oxides. Using Mössbauer, electron-microscopy and neutron diffraction methods, analysis was undertaked of the conditions of nanosize oxides introduction in steel and alloy matrices by way of preliminary dissolution of initial large-size oxides in a powder metal matrix (in the course of mechanical alloying in a mill) followed by precipitation of 3-5 nm in size hardening oxides in the process of high-temperature sintering of mechanically alloyed powder. There were obtained record values of high-temperature strength in oxide dispersion strengthened (ODS) steels. The vacancy void formation upon irradiation of stainless steels by high-energy neutrons can be sup pressed by introduction of high densities of direct and indirect point-defect sinks such as α/γ interfaces and fine intermetallic (γ') or oxide particles in fcc or bcc steels precipitated before or upon irradiation. The compositions of new ODS-steels are proposed.

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