Application of Acoustic Emission to the Study on Cathodic Polarization and SCC for High Strength Steels

Abstract

Abstract: The ambiguous effect of cathodic polarization on SCC of two high strength steels in 0.1 M Na_2HPO_4 and 0.1 M NaNO_3 has been investigated by means of meas- uring electric resistance(R)and recording acoustic emis- sion(AE)signals simultaneously.Results showed that AE sensitivity strongly depends on K value in different solu- tions.Both anodic and cathodic polarization can acceler- ate crack growth rate at high K values,but it appears that there are only subtle differences in their AE characteristics.AE signals only reflect the macroprocesses of crack growth rather than the elementary ones and can not be used for identification of the micro-mechanisms of SCC.

Key words: acoustic emission, cathodic polarization, SCC, high strength steel

ZHU Ziyong V.A.Marichev Institute of Physical Chemistry of the Academy of Sciences of the USSR,Moscow,117171,USSR.. Application of Acoustic Emission to the Study on Cathodic Polarization and SCC for High Strength Steels[J]. J Mater Sci Technol, 1990, 6(2): 88-91.

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Application of Acoustic Emission to the Study on Cathodic Polarization and SCC for High Strength Steels

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