PHASE STABILITY AND SEMICONDUCTING BEHAVIOUR OF LOW ACTIVATION AUSTENITIC MN-CR STEELS

Four compositions of austenitic Mn-Cr steels have been developed successfully for in-vessel component materials in power plant industry. The phase stability of these Mn-Cr steels was studied by and X-ray diffraction (XRD) patterns. XRD patterns have shown that the matrix of these Mn-Cr steels is a single γ-phase structure. The potentiodynamic polarisation curves suggested that these fabricated Mn-Cr steels showed passive behaviour in ۰.۱M H۲SO ۴solution. Therefore, semiconducting behaviour of passive film formed on these fabricated Mn-Cr steels in ۰.۱M H۲SO ۴ solution was evaluated by Mott–Schottky analysis. This analysis revealed that passive films behave as n-type and p-type semiconductors. Based on the Mott–Schottky analysis, it was also shown that donor and acceptor densities are in the order of ۱۰۲۱ cm -۳ and are comparable for other austenitic stainless steels in acidic environments

کلیدواژه ها:

Low activation ، Mn-Cr steel ، XRD ، Mott–Schottky