The relation between the evolution of damage of different-scale levels and local decarburization in high-strength low-alloy structural steels under the action of forces and hydrogen is investigated.
Present paper performs research results of structure and mechanical properties of the ODS steel on the base of steel EP450 (Fe–13Cr–2Mo–Nb–V–B-0,12C) on all stages of producing: from powders to ...thin-walled tubes. Also, the results of research on method of sealing thin-walled tubes from steel EP450 ODS by pressurized resistance welding are shown.
A method for mathematical description of local stress condition and formation of plastic zones near spherical pores formed at room temperature in the volume of low-alloy structural steels during ...their electrolytic hydrogen saturation under stress is proposed. The impact of external tension stress and pressure of gases (hydrogen and methane) in pores is taken into account. The method is promising for specification of kinetic parameters of destruction processes in structural steels under conditions of hydrogen stress corrosion.
Most of the Ultra High Energy Cosmic Ray (UHECR) experiments and projects (HiRes, AUGER, TA, EUSO, TUS, etc.) use air fluorescence to detect and measure extensive air showers (EAS). The precise ...knowledge of the Fluorescence Light Yield (FLY) is of paramount importance for the reconstruction of UHECR. The MACFLY—Measurement of Air Cherenkov and Fluorescence Light Yield—experiment has been designed to perform such FLY measurements. In this paper we will present the results of FLY in the 290–440
nm wavelength range for dry air and pure nitrogen, both excited by electrons with energy of 1.5
MeV, 20
GeV and 50
GeV. The experiment uses a
90Sr radioactive source for low energy measurement and a CERN SPS e
− beam for high energy. We find that the FLY is proportional to the deposited energy (
E
d) in the gas and we show that the air fluorescence properties remain constant independently of the electron energy. At the reference point: atmospheric dry air at 1013
hPa and 23
°C, the ratio FLY/
E
d
=
17.6 photon/MeV with a systematic error of 13.2%.
We develop the methodology proposed earlier by the authors for comprehensive studies of the degradation, destruction, and transition of materials to the local limiting state, based on analyzing the ...parameters of a set of inelastic effects determined by internal friction methods. Attention is given to using as relaxation criteria the parameters of the destruction inelastic effect, which reflects the change in the dislocation dynamics in local areas of stress concentration.
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