| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Vallant, Rudolf
Graz University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (29/29 displayed)
- 2024The effect of thermomechanical welding on the microstructure and mechanical properties of S700MC steel weldscitations
- 2024Welding of S1100 Ultra high-Strength Steel Plates with Matching Metal-Cored Filler Wirecitations
- 2023Critical verification of the effective diffusion conceptcitations
- 2022Undermatched Welding of Ultra-High-Strength Steel S1100 with Metal-Cored Wirecitations
- 2022Mechanical and microstructural properties of S1100 UHSS welds obtained by EBW and MAG weldingcitations
- 2022Resistance of Quench and Partitioned Steels Against Hydrogen Embrittlementcitations
- 2020Evaluation of Quenching and Partitioning C20MnSi Steel microstructure
- 2020Hydrogen embrittlement (HE) of advanced high-strength steels (AHSS)
- 2020Electrochemical and structural property of TiSiNb TFSOC on affordable interconnects in proton exchange membrane fuel cell applicationscitations
- 2019Effects of Er and Zr Additions on the As-Cast Microstructure and on the Solution-Heat-Treatment Response of Innovative Al-Si-Mg-Based Alloyscitations
- 2019Friction stir welding of API X70 steel incorporating Ti-dioxidecitations
- 2019Improvement of hydrogen induced stress corrosion cracking resistance of ultra-high strength steel screws and fasteners
- 2018EFFECT OF FRICTION STIR PROCESSING ON CORROSION BEHAVIOR OF CAST AZ91C MAGNESIUM ALLOYcitations
- 2018The effects of friction stir processing on the wear beahvior of cast AZ91C magnesium alloycitations
- 2018Effect of Ti Addition on the Microstructure and Mechanical Properties of Weld Metals in HSLA Steelscitations
- 2018Characterization of localized corrosion of heat treated Er- and Zr-containing A356 alloys in 3.5 wt% NaCl aqueous solutioncitations
- 2017Pitting corrosion behaviour of stainless steel AISI 304 with different tinting colours
- 2016Experimental investigations on single-sided CMT welding of hybrid aluminum-steel blanks
- 2016Experimental investigation and numerical simulation of resistance spot welding for residual stress evaluation of DP1000 steelcitations
- 2016Effect of Friction Stir Welding on Microstructure and Properties of Micro-TiO_2 doped HSLA Steel
- 2015Surface Modification of pure magnesium and magnesium alloy AZ91 by Friction Stir Processingcitations
- 2012Electron beam welding of a TMCP steel with 700 MPa yield strengthcitations
- 2012Artfremdes Fügen von Magnesium im Karosseriebau
- 2012Influence of the Soft Zone on the Strength of Welded Modern HSLA Steelscitations
- 2009Modification of coupling parameters for a more accurate cumerically coupled simulation of the resistance spot welding process
- 2008The influence of Zinc coatings on the electrode wear during resistance spot welding of sheet steel
- 2008Influence of plastic anisotropy on the mechanical behavior of clinched joint of different coated thin steel sheets
- 2008EXPERIMENTAL AND NUMERICAL INVESTIGATIONS OF CLINCHING PROCESSES FOR CPP COATED THIN STEEL SHEETS
- 2006Influence of Niobium on mechanical properties and hot crack susceptibility of Nickel-base cored-wire weld metal type 70/20 and 70/15
Places of action
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article
Critical verification of the effective diffusion concept
Abstract
<p>Knowing the hydrogen distribution <i>c</i>(<i>x</i>,<i>t</i>) and local hydrogen concentration gradients grad(<i>c</i>) in ferritic steel components is crucial with respect to hydrogen embrittlement. Basically, hydrogen is absorbed from corrosive or gaseous environments via the surface and diffuses through interstitial lattice sites into bulk. Although, the lattice diffusion coefficient <i>D</i><sub>L</sub>∼0.01mm<sup>2</sup>/s is in the order of magnitude of those for well-annealed pure iron, trapping sites in the microstructure retard the long-range chemical diffusion <i>j</i><sub>L</sub>=−<i>D</i><sub>chem</sub>(<i>c</i>)grad(<i>c</i>), causing local hydrogen accumulation in near surface regions in limited time. Considering pure ferritic crystals without trapping sites in the microstructure, the limited characteristic diffusion depth <i>x</i><sub>c</sub>∼√<i>D</i><sub>eff</sub><i>t</i> is proportional to the square root of the effective diffusion coefficient <i>D</i><sub>eff</sub> and of time <i>t</i>. Effective diffusion coefficients are measured independently for hydrogen using the electrochemical permeation technique. For pure crystals, the effective diffusion coefficient is constant at given temperature and allows accurate calculations of the diffusion depths. However, with trapping sites in the microstructure the effective diffusion coefficient is not a material property anymore and becomes dependent on the hydrogen charging conditions. In the present work, the theory of hydrogen bulk diffusion is used to verify the concept of effective diffusion. For that purpose, the generalized bulk diffusion equation was solved numerically by using the finite difference method (FDM). The implementation was checked using analytical solutions and a comprehensive convergence study was done to avoid mesh and time dependency of the results. It is shown that effective diffusion coefficients can vary by magnitudes depending on the sub-surface lattice concentration. This limits the application of the effective diffusion concept and also the calculation of the characteristic diffusion depth.</p>