Regensburg 2010 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 21: Mechanical Properties I
MM 21.5: Talk
Tuesday, March 23, 2010, 11:15–11:30, H6
Crack tip opening displacement and propagation rate of microstructurally short cracks in austenitic stainless steel — •Michael Scharnweber1, Ingmar Roth2, Martin Kübbeler3, Carl-Georg Oertel1, Wolfgang Tirschler1, Hans-Jürgen Christ2, Claus-Peter Fritzen3, Ulrich Krupp4, and Werner Skrotzki1 — 1Institut für Strukturphysik, Technische Universität Dresden, 01062 Dresden — 2Institut für Werkstofftechnik, Universität Siegen, 57076 Siegen — 3Institut für Mechanik und Regelungstechnik, Universität Siegen, 57076 Siegen — 4Fakultät für Ingenieurwissenschaften und Informatik, Fachhochschule Osnabrück, 49009 Osnabrück
Austenitic stainless steel (X2 CrNiMo 18 14 3) has been cyclically deformed at RT in air under plastic strain control with an amplitude of 5*10−4 for N=10000 cycles to initiate microstructurally short cracks. Average crack propagation rates were measured with the scanning electron microscope (SEM) in steps of ΔN=5000 cycles. Additionally, the crack tip opening displacement (CTOD) was obtained via in-situ-deformation in the SEM. It is the aim of the present study to quantify the influence of grain boundaries on crack growth and determine the correlation between the two values measured. This may offer the possibility to replace time consuming measurements of the crack propagation rate by the much quicker measurement of the CTOD.