Dresden 2011 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 46: Mechanical Properties III
MM 46.8: Talk
Friday, March 18, 2011, 12:15–12:30, IFW D
Influence of grain boundaries and crack length on the propagation of microstructurally short cracks in austenitic stainless steel — •Michael Scharnweber1, Carl-Georg Oertel1, Vladimir Mikulich2, Wolfgang Tirschler1, and Werner Skrotzki1 — 1Institut für Strukturphysik, TU Dresden, 01062 Dresden — 2Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik, 09126 Chemnitz
Austenitic stainless steel (X2 CrNiMo 18 14 3) was cyclically deformed at RT in air under plastic strain control with amplitudes of 5×10−4 and 2×10−3. Every 30.000 and 3.000 cycles, respectively, the samples were investigated in the scanning electron microscope in order to determine the propagation rate of the existing microstructurally short cracks as well as the corresponding distance between the crack tip and the opposing grain boundary. The results will be discussed with regard to the barrier effect of grain boundaries to crack propagation as well as the correlation between crack length and propagation rate at different strain amplitudes.