| NUKLEONIKA 2013, 58(1):215-219
ANNEALING BEHAVIOUR OF PLASTICALLY DEFORMED STAINLESS STEEL 1.4307 STUDIED BY POSITRON ANNIHILATION METHODSEwa Dryzek, Maciej Sarnek, Krzysztof Siemek Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN), 152 Radzikowskiego Str., 31-342 Kraków, Poland Isochronal and isothermal annealing of stainless steel 1.4307 samples deformed by compression were investigated using Doppler broadening measurements of the annihilation line. We made an attempt to describe the obtained dependencies in terms of vacancy migration and sinking to the grain boundaries. The model assumed spherical grains with a homogeneous initial distribution of vacancies. The model was capable of following the isochronal annealing data quite accurately. However, the obtained activation energy of vacancy migration equal to 0.44 +/- 0.05 eV seemed too low. The isothermal annealing dependency was reproduced less precisely. The reason for this may be the presence of the aplha’-martensite particles in the samples, which can introduce additional defects seen by positrons in the temperature range in which the martensite reversion takes place. Close X |