Andreas Muhr

Voestalpine (Austria)

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Gerald Luckeneder

Voestalpine (Austria)

Tomáš Prošek

University of Chemistry and Technology, Prague

Darya Rudomilova

University of Chemistry and Technology, Prague

Hubert Duchaczek

Voestalpine (Austria)

Gabriela Schimo‐Aichhorn

Kompetenzzentrum für elektrochemische Oberflächentechnologie

Ines Traxler

Kompetenzzentrum für elektrochemische Oberflächentechnologie

Karl-Heinz Stellnberger

Voestalpine (Austria)

Josef Faderl

Voestalpine (Austria)

Sabine Hild

Johannes Kepler University of Linz

Achim Walter Hassel

Danube Private University

Cooperative Institutions

Stahl-Zentrum (Germany)

Deutsches Elektronen-Synchrotron DESY

Voestalpine (Austria)

Johannes Kepler University of Linz

University of Chemistry and Technology, Prague

Kompetenzzentrum für elektrochemische Oberflächentechnologie

Institute of Chemical Technology

Forest Science and Technology Centre of Catalonia

Raja Ramanna Centre for Advanced Technology

Fundació CTM Centre Tecnològic

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(In Situ) Determination of Hydrogen Entry into Galvanized Dual-phase Steel During Corrosive Exposure

BHM Berg- und Hüttenmännische Monatshefte (2023)

Gabriela Schimo‐Aichhorn Ines Traxler Andreas Muhr Gerald Luckeneder Josef Faderl

Abstract The aim of this contribution is to present a comprehensive approach to study the extent of hydrogen entry into a hot-dip-galvanized DP1000 steel, which is exposed to corrosive conditions. For this purpose, the Z100 coating was immersed in 5% sodium chloride solution at room temperature. The distribution of hydrogen and the spots of increased hydrogen entry were detected with scanning Kelvin probe (SKP) and scanning Kelvin probe force microscopy (SKPFM). Effects of hydrogen inserted during corrosion on the mechanical properties were determined in slow-strain rate tests (SSRT). Hydrogen quantification was achieved via thermal desorption mass spectrometry (TDMS), giving additional insights into the mobility of the inserted hydrogen within the steel by distinguishing diffusible and trapped hydrogen.

Thermal desorption

10.1007/s00501-022-01314-3

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Citations (1)

Energy release rates for small cracks in rubber components

Routledge eBooks (2017)

Julia Gough Andreas Muhr

The fatigue life of rubber components is believed to be determined by the development and growth of cracks from small pre-existing flaws, either at the rubber surface, at the bond line in the case of rubber-metal bonded components, or within the bulk material. According to fracture mechanics, the rate at which the flaws grow is governed by the energy release rate. This chapter presents Finite Element (FE) calculations of energy release rates for small "flaws" in a variety of representative situations, including surface and interior cracks, and finite strains. The results are discussed in the context of classical Linear Elastic Fracture Mechanics (LEFM) solutions. It is concluded that the energy release rate can be calculated with reasonable accuracy from the stress state at the point of interest. An attempt is made to empirically modify Sack's equation for finite strain effects, but difficulties remain when there is a significant hydrostatic pressure.

10.1201/9781315140216-9

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Citations (3)

Review of Experimental Methods for Hydrogen Embrittlement Susceptibility Assessment of Press-Hardened Steels

A. Concustell Andreas Muhr A. Aouafi Daniel Casellas David Frómeta

Embrittlement

10.33313/512/b0701

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Comparative study of devices for hydrogen permeation measurements

Materials and Corrosion (2018)

Darya Rudomilova Tomáš Petrek Tomáš Prošek V. Šefl Hubert Duchaczek

New devices for measurement of hydrogen permeability in steels using electric resistance sensors have been assessed. Diffusion coefficients of two types of advanced high strength steels obtained with the traditional electrochemical permeation technique using the Devanathan–Stachurski permeation setup and the novel techniques are compared. The EPT technique is found to be more appropriate for laboratory assessment of hydrogen permeability due to generally better control over the experiment and data evaluation. The novel setups can be a good choice for comparative hydrogen measurements in real environments, including atmospheric ones, because of simpler sample preparation and small size of hydrogen probes.

10.1002/maco.201810134

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Citations (3)

Scanning Kelvin probe study of hydrogen formed during atmospheric corrosion

Metal ... (2019)

Darya Rudomilova Tomáš Prošek Gabriela Schimo‐Aichhorn Ines Traxler Andreas Muhr

10.37904/metal.2019.713

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Novel Annealing Procedures for Improving Hot Dip Galvanizing of High Strength Steels

Michael Rohwerder A. Vogerl Alexander Jarosik Andreas Muhr Martin Norden

High strength steel

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Hydrogen embrittlement of DP-1000 flat steel sheet: Influence of mechanical properties, specimen geometry, pre-damaging and electrolytically zinc galvanizing

Materials and Corrosion (2015)

R. Scharf Andreas Muhr Gerald Luckeneder P. Larour Klemens Mraczek

Studies towards the impact of solute hydrogen on the mechanical properties of ultra-high strength sheet steel grades (UHSS) for the automotive industry have been increasingly conducted in the past years. This paper focuses on the pre-damaging of a dualphase DP-1000 automotive sheet steel, as found in the manufacturing of automotive body parts, in connection with hydrogen embrittlement. It is shown that the kind of pre-damaging of the specimens has a severe influence on the occurrence of hydrogen embrittlement. Hydrogen embrittlement resistance under corrosive conditions was determined through constant load tests. Tensile specimens, manufactured from electrolytically zinc galvanized DP-1000 steel, were immersed in a 5% sodium chloride solution. The impact of material properties, pre-damaging and specimen geometry are critically discussed. Furthermore a discussion is given about the material testing methods most suitable to indicate high or low hydrogen embrittlement resistance if constant load testing is performed.

Embrittlement

10.1002/maco.201508434

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Citations (17)

Hydrogen Entry into Zinc-Coated Steel Induced by Atmospheric Corrosion after Local Chloride Deposition

Darya Rudomilova Tomáš Prošek Andreas Muhr Gerald Luckeneder

Deposition

Hydrogen chloride

10.2139/ssrn.5009576

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Critical Assessment of the Effect of Atmospheric Corrosion Induced Hydrogen on Mechanical Properties of Advanced High Strength Steel

Metals (2020)

Darya Rudomilova Tomáš Prošek Ines Traxler Josef Faderl Gerald Luckeneder

Hydrogen absorption into steel during atmospheric corrosion has been of a strong concern during last decades. It is technically important to investigate if hydrogen absorbed under atmospheric exposure conditions can significantly affect mechanical properties of steels. The present work studies changes of mechanical properties of dual phase (DP) advanced high strength steel specimens with sodium chloride deposits during corrosion in humid air using Slow Strain Rate Test (SSRT). Additional annealed specimens were used as reference in order to separate the possible effect of absorbed hydrogen from that of corrosion deterioration. Hydrogen entry was monitored in parallel experiments using hydrogen electric resistance sensor (HERS) and thermal desorption mass spectrometry (TDMS). SSRT results showed a drop in elongation and tensile strength by 42% and 6%, respectively, in 27 days of atmospheric exposure. However, this decrease cannot be attributed to the effect of absorbed hydrogen despite the increase in hydrogen content with time of exposure. Cross-cut analysis revealed considerable pitting, which was suggested to be the main reason for the degradation of mechanical properties.

Elongation

Pitting Corrosion

10.3390/met11010044

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Citations (8)

Formation of crust on natural rubber after ageing

CRC Press eBooks (2011)

Shamsul Kamaruddin Pierre‐Yves Le Gac Yann Marco Andreas Muhr

10.1201/b11687-37

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Citations (5)