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Berlin 2015 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 25: Hydrogen in Metals V: H in Steels

MM 25.2: Talk

Tuesday, March 17, 2015, 12:15–12:30, TC 006

Influence of hydrogen on the fatigue strength of ferritic stainless steelAndrej Turk1, •Georg Schauer2, and Ferdinand Haider31Technische 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.

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