Influence of Tungsten and Carbon Addition on Electrochemical Behaviour of 9 % Cr Creep-resistant Steel

Co-authors BYSTRIANSKÝ Jaroslav

Martensitic 9 % Cr steel belong to modern creep-resistant materials. Structural instability at higher service temperatures lead to coarsening of particles and precipitation of new phases. Mentioned material changes cause decreasing of mechanical properties at high temperatures and change of resistance against steam oxidation. Electrochemical polarization is possible non-destructive detection method of these phases. Tungsten and carbon significantly contribute to forming of phases in the structure, most significantly of carbides and Laves phases. In this work influence of addition of these elements on electrochemical behaviour of 9 % Cr steel with impact on transpassivity area was studied.