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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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Shirzadi, Amir A.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (21/21 displayed)
- 2020Diffusion bonding of TiC or TiB reinforced Ti–6Al–4V matrix composites to conventional Ti–6Al–4V alloycitations
- 2019Development of Auto Ejection Melt Spinning (AEMS) and its application in fabrication of cobalt-based ribbonscitations
- 2019Layered Structures of Ti-6Al-4V Alloy and Metal Matrix Composites on Its Base Joint by Diffusion Bonding and Friction Weldingcitations
- 2019Modelling and design of new stainless-steel welding alloys suitable for low-deformation repairs and restoration processescitations
- 2019Mechanical Properties and Processing Techniques of Bulk Metal–Organic Framework Glassescitations
- 2019A new method for liquid-phase bonding of copper plates to aluminum nitride (AlN) substrates used in high-power modulescitations
- 2018Gallium-assisted diffusion bonding of stainless steel to titanium; microstructural evolution and bond strengthcitations
- 2016Effect of Cu addition on microstructure and impact toughness in the simulated coarse-grained heat-affected zone of high-strength low-alloy steelscitations
- 2015Microstructure and Interfacial Reactions During Vacuum Brazing of Stainless Steel to Titanium Using Ag-28 pct Cu Alloycitations
- 2015Austenite memory and variant selection in a novel martensitic welding alloycitations
- 2013Microstructure and interfacial reactions during active metal brazing of stainless steel to titaniumcitations
- 2012Effect of SiC reinforcement particles on the grain density in a magnesium-based metal-matrix composite: modelling and experimentcitations
- 2012Crystallization model of magnesium primary phase in the AZ91/SiC compositecitations
- 2011Combined effect of stress and strain on crystallographic orientation of bainite
- 2011Design of weld fillers for mitigation of residual stresses in ferritic and austenitic steel weldscitations
- 2010Neural network modelling of hot deformation of austenite
- 2010Comparison of alloying concepts for Low Transformation Temperature (LTT) welding consumables
- 2010Modelling of residual stress minimization through martensitic transformation in stainless steel welds
- 2009Stainless steel weld metal designed to mitigate residual stressescitations
- 2009Bainite orientation in plastically deformed austenitecitations
- 2008Joining ceramics to metals using metallic foamcitations
Places of action
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article
Modelling and design of new stainless-steel welding alloys suitable for low-deformation repairs and restoration processes
Abstract
The plasticity associated with low-temperature martensitic transformation can be exploited to reduce the stresses developed due to thermal contraction of the weldments. The key feature of stress-mitigating welding alloys is their transformation from austenite to martensite at low temperatures e.g. ideally close to ambient temperature. Thermodynamics databases (MTDATA and SGTE) were used to model and design new welding alloys with low martensitic transformation temperatures (Ms) around 200 °C. The modelling, conducted in this work, was based on this assumption that martensitic transformation starts at a certain temperature when the free-energy change for austenite to transform to ferrite reaches a critical value. Since martensitic transformation is a diffusion-less process, the change in free-energy vs. temperature was calculated for the austenite and ferrite phases with the same composition.Three prototype welding alloys, CamAlloys 4 & 5 and OpenAlloy 1, were successfully designed and made in the University of Cambridge (UK) and the Open University (UK). The design of these alloys was purely based on thermodynamics equations.Comprehensive characterisation, examinations and mechanical tests showed this family of alloys could substantially reduce contraction-induced deformations in stainless steel weldments. One of the applications of these alloys is in the repair and restoration of damaged stainless-steel components.