Dresden 2009 – scientific programme
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DS: Fachverband Dünne Schichten
DS 26: Poster II
DS 26.23: Poster
Wednesday, March 25, 2009, 09:30–12:30, P5
Statistical slip step evaluation in CrMn and CrNi cold worked steels by atomic force microscopy — •Nurdogan Gürkan1, Gregor Hlawacek1, Christian Teichert1, Robert Sonnleitner2, and Gregor Mori2 — 1Institute of Physics, University of Leoben, 8700 Leoben, Austria — 2Christian Doppler Laboratory of Localized Corrosion, 8700 Leoben, Austria
Austenite stainless steels like CrMnN 18-21-0.66 and CrNiMoN 27-30-3-0.3 are sensitive to stress corrosion cracking (SCC). To obtain the required strength this steel type has to be cold worked which will also influence their resistance against SCC. In this investigations solution annealed, 14%, and 27% cold worked samples are used. The samples are dynamically loaded with R=0.5 at 20 Hz. Reference samples are cycled in Glycerin and a corrosive environment is simulated with a 62% CaCl2 solution at 120∘. The resulting slip step patterns close to the crack initiation point are statistically evaluated using atomic force microscopy (AFM) in intermittant mode under ambient conditions. Height of the slip steps as well as their distance and distribution are analyzed. The results are compared and demonstrate the importance of slip steps for the corrosive attack.