Abstract
Corrosion-fatigue crack growth rates in Kh8CrNiTi18.10 steel have been related to the stress intensity coefficient ΔK in tests in distilled water containing NaOH added to pH 8 and with the addition of NaCl and CuCl2 at various concentrations. These data have been used with measurements on the pH and electrode potential of the metal near the growing crack vertex and with tests on the failure surfaces by electron microscopy and mass spectrometry, which shows that adding CuCl2 at the stage when the main corrosion-fatigue crack is propagating has a positive effect because it accelerates the formation of microcracks and thus reduces the stress concentration at the vertex. Adding NaCl accentuates local corrosion and hydrogen production, which increases the crack growth rate.
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