Investigation of fine atomic structure of low-activation chromium steel using Mössbauer spectroscopy and calorimetry within the temperature range of ductile-to-brittle transition

• Published in: Inorganic materials : applied research 2012-04, Vol.3 (2), p.102-106
• Main Authors: Boiko, N. V., Devyatko, Yu. N., Evstyukhina, I. A., Izmailov, O. N., Rudakov, S. G., Smirnov, M. N.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Materials for Aerospace Engineering; Materials Science
• ISSN: 2075-1133; 2075-115X
• DOI: 10.1134/S2075113312020049

Using Mössbauer spectroscopy on 57Fe nuclei within the range of ductile-to-brittle transition temperatures, a change in the force constants is revealed mainly in the iron environment with a single atom of chromium in the ferritic-martensitic 12% chromium steel EK181, and anomalies are also detected in behavior of the effective magnetic fields and the 3d-electron density on the iron nuclei. It is shown that the partial Debye temperature for an iron environment with a single atom of chromium lies within the ductile-to-brittle transition temperature range. From calorimetric measurements of the internal energy of steel, an anomaly in the behavior of the heat capacity is found, which disappears after thermocycling (from −140 to 40°C) and reappears after annealing at 550°C.