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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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Stockinger, Martin
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Topics
Publications (19/19 displayed)
- 2024Effect of intercritical annealing on the microstructure and mechanical properties of a PH 13-8 Mo maraging steelcitations
- 2024Multiscale in-situ observations of the micro- and nanostructure of a PH 13-8 Mo maraging steel during austenitizationcitations
- 2023In Situ Observations of the Microstructural Evolution during Heat Treatment of a PH 13-8 Mo Maraging Steelcitations
- 2023Ballistic tests on hot-rolled Ti-6Al-4V platescitations
- 2022Influence of delta ferrite on the impact toughness of a PH 13-8 Mo maraging steelcitations
- 2021Theoretical and experimental investigations of mechanical vibrations of hot hammer forgingcitations
- 2021Dry friction under pressure variation of PACVD TiN surfaces on selected automotive sheet metals for the application in unlubricated metal formingcitations
- 2016Additive Manufacturing via Cold Metal Transfer
- 2014Studies on ductile damage and flow instabilities during hot deformation of a multiphase γ-TiAl alloycitations
- 2014Modelling of the ductile damage behaviour of a beta solidifying gamma titanium aluminide alloy during hot-workingcitations
- 2014Thermomechanical behavior of different Ni-base superalloys during cyclic loading at elevated temperaturescitations
- 2014Modeling of two-phase grain structure in the titanium alloy TI-6AL-4V using cellular automatacitations
- 2013Modeling of dual-phase grain structure in Ti-6Al-4V during isothermal and non-isothermal heat treatment using cellular automata
- 2012Determination of the mechanism of restoration in subtransus hot deformation of Ti-6Al-4Vcitations
- 2012Influence of temperature and strain rate on dynamic softening processes in AllvacR 718PlusTMcitations
- 2011Assessment of dynamic softening mechanisms in Allvac® 718Plus™ by EBSD analysiscitations
- 2009Introduction to an approach based on the (α+β) microstructure of elements of alloy Ti-6Al-4Vcitations
- 2008δ-phase characterization of superalloy Allvac 718 Plus™
- 2007Fatigue analysis of forged aerospace components based on micro structural parameters
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article
Influence of delta ferrite on the impact toughness of a PH 13-8 Mo maraging steel
Abstract
Due to the fact that maraging steels are widely utilized as structural parts for the aerospace industry, high and consistent impact toughness is crucial to ensure reliability under extreme mechanical loads. The toughness of maraging steels is heavily influenced by the martensitic structure and reverted austenite. Another microstructural constituent is residual delta ferrite that originates from non-equilibrium solidification. This work focuses on the effect of delta ferrite on the impact toughness of a PH 13-8 Mo maraging steel, while keeping other toughness-influencing factors as constant as possible. Three-step heat treatments were applied to samples for adjusting different phase fractions of delta ferrite. Charpy impact testing revealed that the impact toughness decreases with an increasing phase fraction of delta ferrite. However, no significant influence on the lower energy shelf, i.e. the impact energies below the ductile-to-brittle transition temperature range, was found. In addition, no decrease in hardness at room temperature was measured when delta ferrite is present in the microstructure. Particle analysis by APT measurements revealed that delta ferrite contains Ni- and Al-rich precipitates. It is assumed that those precipitates in combination with effective solid solution hardening by Cr, Mo and Al significantly contribute to the hardness of delta ferrite, which is in the range of martensite. Furthermore, EDS analysis showed a depletion in Ni in delta ferrite, presumably resulting in a lower cleavage fracture resistance compared to martensite, and, therefore, causing embrittlement. Moreover, the interface between delta ferrite and martensite possibly plays an additional role for crack initiation due to amplified local stresses.