ACTA

Slow Positron Beam Studies of the Stainless Steel Surface Exposed to Sandblasting

P. Horodek^{a, b}, J. Dryzek^{b, c}, A.G. Kobets^{a, d}, M. Kulik^{a, e}, V.I. Lokhmatov^a, I.N. Meshkov^a, O.S. Orlov^a, V. Pavlov^a, A.Yu. Rudakov^a, A.A. Sidorin^a, K. Siemek^b and S.L. Yakovenko^a
^aJoint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Moscow region, Russia
^bInstitute of Nuclear Physics, PAS, E. Radzikowskiego 152, 31-342 Kraków, Poland
^cInstitute of Physics, Opole University, Oleska 48, 45-052 Opole, Poland
^dInstitute of Electrophysics and Radiation Technologies, NAS of Ukraine, Chernyshevsky St. 28, 61002 Kharkov, Ukraine
^eInstitute of Physics, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

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The paper presents slow positron beam studies of the stainless steel grade 304 AISI samples annealed in the flow N₂ atmosphere and sandblasted under different pressure from 1 to 7 bar. Heating of specimens caused formation of an additional layer on the surface which can be identified as oxides. Sandblasting reduces the thickness of the oxide layer and also defects concentration (vacancies as we suppose) decreases in dependence on pressure applied during blasting. Additionally, the atomic concentrations of oxygen have been obtained using nuclear methods (Rutherford backscattering and nuclear reactions) in the near surface layers of the studied samples.

DOI: 10.12693/APhysPolA.125.714
PACS numbers: 78.70.Bj, 82.80.Yc, 61.82.Bg