| 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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Hald, John
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (67/67 displayed)
- 2024High temperature corrosion and oxide scale formation of nickel in molten NaOH at various basicity levelscitations
- 2023Enhancing high-temperature suitability of Ni-electroplated AISI 441 steel by soft-chromisingcitations
- 2022Effect of the thermo‐mechanical processing on the impact toughness of a 12% cr martensitic steel with co, cu, w, mo and ta dopingcitations
- 2022Effects of interdiffusion in nickel coated AISI 441 steelcitations
- 2021Multiscale in-situ studies of strain-induced martensite formation in inter-critically annealed extra-low-carbon martensitic stainless steelcitations
- 2020Evolution of substructure in low-interstitial martensitic stainless steel during temperingcitations
- 2019Corrosion behaviour of Ni and nickel aluminide coatings exposed in a biomass fired power plant for two yearscitations
- 2019Nitridation of grate in a biomass-fired boiler
- 2019Analyzing Boron in 9–12% Chromium Steels Using Atom Probe Tomographycitations
- 2019Effect of service exposure on KCl corrosion attack of AISI 347H FG steelcitations
- 2019Effect of service exposure on KCl corrosion attack of AISI 347H FG steelcitations
- 2019Corrosion of welds in biomass power plantscitations
- 2018In-situ analysis of redistribution of carbon and nitrogen during tempering of low interstitial martensitic stainless steelcitations
- 2018Fine (Cr,Fe)2B borides on grain boundaries in a 10Cr–0.01B martensitic steelcitations
- 2018Formation and stabilization of reverted austenite in supermartensitic stainless steelcitations
- 2018Experimental and theoretical investigation of precipitate coarsening rate in Z-phase strengthened steelscitations
- 2018Effects of Different Fuel Specifications and Operation Conditions on the Performance of Coated and Uncoated Superheater Tubes in Two Different Biomass-Fired Boilerscitations
- 2018Effect of microstructure on KCl corrosion attack of modified AISI 310 steelcitations
- 2018Effect of microstructure on KCl corrosion attack of modified AISI 310 steelcitations
- 2018Microstructural investigations of Ni and Ni2Al3 coatings exposed in biomass power plantscitations
- 2017Kinetics analysis of two-stage austenitization in supermartensitic stainless steelcitations
- 2017Effect of ageing on KCl corrosion attack of AISI 347H FG steel
- 2017Effect of ageing on KCl corrosion attack of AISI 347H FG steel
- 2017Microstructure of Z-phase strengthened martensitic steels: Meeting the 650°C challengecitations
- 2017Formation and stabilization of reversed austenite in supermartensitic stainless steel
- 2017Kinetics modeling of delta-ferrite formation and retainment during casting of supermartensitic stainless steelcitations
- 2016Laboratory Investigations of Ni-Al Coatings Exposed to Conditions Simulating Biomass Firing
- 2016Laboratory Investigations of Ni-Al Coatings Exposed to Conditions Simulating Biomass Firing
- 2016Prospects for Martensitic 12 % Cr Steels for Advanced Steam Power Plantscitations
- 2016In Situ Techniques for the Investigation of the Kinetics of Austenitization of Supermartensitic Stainless Steelcitations
- 2016Prospects for Martensitic 12 % Cr Steels for Advanced Steam Power Plantscitations
- 2016A new 12% chromium steel strengthened by Z-phase precipitatescitations
- 2015Comparison of Steam Oxidation of 18%Cr Steels from Various Power Plants
- 2014Challanges in Steel Science & Technology
- 2013Investigation on Long-term Creep Rupture Properties and Microstructure Stability of Fe-Ni based Alloy Ni-23Cr-7W at 700°Ccitations
- 2013Kinetics of Z-Phase Precipitation in 9 to 12 pct Cr Steelscitations
- 2012Atomic resolution investigations of phase transformation from TaN to CrTaN in a steel matrix
- 2011High-temperature lead-free solder alternativescitations
- 2010High-Temperature Lead-Free Solder Alternatives: Possibilities and Properties
- 2010Development of Au-Ge based candidate alloys as an alternative to high-lead content solderscitations
- 2010Design of lead-free candidate alloys for high-temperature soldering based on the Au–Sn systemcitations
- 2010On the role of Nb in Z-phase formation in a 12% Cr steelcitations
- 2010On the role of Nb in Z-phase formation in a 12% Cr steelcitations
- 2010Conversion of MX Nitrides to Modified Z-Phase in 9-12%Cr Ferritic Steels
- 2010Conversion of MX nitrides to Z-phase in a martensitic 12% Cr steelcitations
- 2009A Feasibility Study of Lead Free Solders for Level 1 Packaging Applications
- 2009On the nucleation and dissolution process of Z-phase Cr(V,Nb)N in martensitic 12%Cr steelscitations
- 2009Solidification paths in modified Inconel 625 weld overlay materialcitations
- 2009Au-Ge based Candidate Alloys for High-Temperature Lead-Free Solder Alternatives
- 2009Assessment of potential solder candidates for high temperature applications
- 2009A Corrosion Investigation of Solder Candidates for High-Temperature Applicationscitations
- 2009Development of gold based solder candidates for flip chip assemblycitations
- 2008A study on Z-phase nucleation in martensitic chromium steelscitations
- 2008Development of high melting point, environmentally friendly solders, using the calphad approach
- 2008Thermodynamic and kinetic modelling: creep resistant materialscitations
- 2008Microstructure and long-term creep properties of 9–12% Cr steelscitations
- 2007Grey-scale conversion X-ray mapping by EDS of multielement and multiphase layered microstructurescitations
- 2007A thermodynamic model of the Z-phase Cr(V, Nb)Ncitations
- 2006Behaviour of Z phase in 9–12%Cr steels
- 2006Segregation effects and phase developments during solidification of alloy 625
- 2006Estimation of metal temperature of MCrAlY coated IN738 components based on interdiffusion behaviour
- 2005Long term steam oxidation of TP 347H FG in power plantscitations
- 2004Z-phase in 9-12% Cr Steels
- 2004Segregation behaviour and phase developments during solidification of Inconel 625; effect of iron and carbon
- 2004Creep strength and ductility of 9 to 12% chromium steels
- 2004Long-term Stability of 9- to 12 % Cr Steels
- 2001Quantification of Laves Phase Particle Size in 9CrW Steel
Places of action
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thesis
Conversion of MX Nitrides to Modified Z-Phase in 9-12%Cr Ferritic Steels
Abstract
The 9-12%Cr ferritic steels are extensively used in modern steam power plants at service temperature up to 620°C. Currently the best perform ing ferritic creep resistance steel is the ASTM Grade 92, whose high temperature strength has recently been assessed by European Creep Collaborative Committee in 2005 as 600°C/113MPa/10 5h. All previous attempts made in the last twenty years to develop ferritic steels for 650°C applications have failed due to the incapacity to combine the superior oxidation resistance, given by 12%Cr content, with excellent creep resistance of high-alloyed ferritic steels. Indeed the fast conversion of finely distributed MX nitrides, which highly promote creep strengthening, to larger and thermodynamically more stable modified Z-phase, Cr(V,Nb)N, led to an unforeseen drop of creep resistance of 12%Cr steels. Since chromium content was confirmed to be the main driving force for Z-phase formation, this explains why 12%Cr steels (i.e. P122, VM12, NF12) suffer from fast and abundant Z-phase precipitation, while 9%Cr steels (i.e. Grades 91, 92, 911) do not. In this thesis the role of vanadium and niobium nitrides in the formation of Z-phase in 9-12%Cr steels is investigated. With this purpose in mind, two 12%Cr model alloys, 12CrVNbN and 12CrVN, with ultra low carbon content, were manufactured. Both model alloys consisted of Cr-, V- and Nb-nitrides only. The first model alloy, 12CrVNbN, was especially designed to quickly convert the complex V- and Nb-nitrides into modified Z-phase. The second model alloy, 12CrVN, was selected to investigate the transformation of pure V-nitride into V-based Z-phase, CrVN, and through comparison to understand the effect of Nb. Thus, without the disturbing interferences of carbides and intermetallic phases (i.e. M23C6, NbC, Fe2(Mo,W)) it was possible to identify all stages of MX conversion to Z-phase particle during ageings at 600°C, 650°C and 700°C up to 10 4 hours. Transmission Electron Microscopy (TEM) and X-Ray powder Diffraction (XRD) were applied to follow ...