Abstract
In order to investigate the possibility of electrochemical material characterization method as a procedure for evaluating creep damage of 12%Cr ferritic steels, this method was applied to the creep damaged specimens of three kinds of steels used in boiler and steam turbine. Experimental results revealed that the peak current densities "I_<p1>" and "p_<p2>" appeared at specific potentials during anodic polarization curve measurement in 1M-KOH solution The I_<p2> which corresponded to the selective dissolution of M_<23>C_6 and Laves phase, increased more significantly with creep than thermal aging in all three steels. On the other hand, the effect of applied stress was not clearly reflected on the change in I_<p1> corresponding to the selective dissolution of copper precipitate in the boiler steel, although it increased with thermal aging and creep as well as the I_<p2>.
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