Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 25: Hydrogen in Metals V: H in Steels
MM 25.2: Vortrag
Dienstag, 17. März 2015, 12:15–12:30, TC 006
Influence of hydrogen on the fatigue strength of ferritic stainless steel — Andrej Turk1, •Georg Schauer2, and Ferdinand Haider3 — 1Technische Universität München — 2Robert Bosch GmbH — 3Universität Augsburg
In this work the fatigue behaviour of 1.4005IA stainless ferritic steel is investigated. Stress S-N and strain S-N curves are obtained with respect to two parameters: load ratio R and surface residual stresses. Air-tested specimens are compared to specimens electrochemically precharged with hydrogen and tested in a gaseous hydrogen atmosphere of 10 bar. The fracture surfaces of broken specimens are analysed to determine the nature of the failure, its point of origin and how the surface is related to the experimental parameters. While such observations have been reported for a variety of high-strength steels and austenitic steels, little information on ferritic stainless steels is available to date. Additionally, TDS measurements of precharged specimens are carried out to investigate hydrogen distribution in the microstructure and hydrogen saturation kinetics. A review of hydrogen embrittlement mechanisms under static loading is given and used to evaluate the experimental results. The applicability of these mechanisms to cyclic loading conditions is discussed as well as their likelihood in this particular case.