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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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Nyborg, Lars
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (30/30 displayed)
- 2024Full Density Powder Metallurgical Cold Work Tool Steel through Nitrogen Sintering and Capsule-Free Hot Isostatic Pressingcitations
- 2024Corrosion resistance of additively manufactured aluminium alloys for marine applicationscitations
- 2023The effect of powder reuse on the surface chemical composition of the Scalmalloy powder in Powder Bed Fusion – Laser Beam processcitations
- 2023In situ Imaging of Precipitate Formation in Additively Manufactured Al-Alloys by Scanning X-ray Fluorescencecitations
- 2020Effect of atomization on surface oxide composition in 316L stainless steel powders for additive manufacturingcitations
- 2020Full Densification in PM Steels Through Liquid Phase Sintering and HIP Approach
- 2018Enhanced Densification of PM Steels by Liquid Phase Sintering with Boron-Containing Master Alloycitations
- 2017Influence of friction models on FE simulation results of orthogonal cutting processcitations
- 2015Nitrogen uptake of nickel free austenitic stainless steel powder during heat treatment : an XPS study
- 2015Influence of the PM-processing route and nitrogen content on the properties of Ni-free austenitic stainless steel
- 2015Thermodynamic And Kinetic Aspects Of Oxide Transformation During Sintering Of Cr-Prealloyed Pm Steels
- 2014EFFICIENCY AND TEMPERATURE RANGES OF ACTIVITY OF DIFFERENT REDUCING AGENTS DURING SINTERING OF CR-PREALLOYED PM STEELS
- 2014Surface Oxides on Gas and Water Atomized Steel Powders
- 2014Microstructure Development in Powder Metallurgy Steels: Effect of Alloying Elements and Process Variables
- 2014Oxide Transformation in Cr-Mn-Prealloyed Sintered Steels: Thermodynamic and Kinetic Aspects
- 2014Thermogravimetry Study of the Effectiveness of Different Reducing Agents during Sintering of Cr-prealloyed PM Steels
- 2014THERMODYNAMIC AND KINETIC ASPECTS OF OXIDE TRANSFORMATION DURING SINTERING OF CR-PREALLOYED PM STEELS
- 2014Effectiveness of reducing agents during sintering of Cr-prealloyed PM steels
- 2013Characteristics of Surface Oxides: Similarities and Differences between Gas and Water Atomized Steel Powders
- 2013Surface Oxides on Gas and Water Atomized Steel Powders
- 2013Effect of Processing Parameters on Oxide Transformation in Cr-Mn-Prealloyed Sintered Steels
- 2013Effectiveness of Different Reducing Agents during Sintering of Cr-Prealloyed PM Steels
- 2013An experimental investigation of the influence of cutting-edge geometry on the machinability of compacted graphite ironcitations
- 2012Methodology for evaluating effects of material characteristics on machinability-theory and statistics-based modelling applied on Alloy 718citations
- 2012Influence of nitrogen atmosphere on reduction mechanisms of a high strength austenitic steel
- 2012Process Control System for Delubrication of PM Steels
- 2011Oxide Transformation during Sintering of Cr and Mn Prealloyed Water Atomized Steel Powder
- 2011Characterization of high-Mn-Cr austenitic steel powder Fe-19Mn-18Cr-C-N
- 2011CHANGES IN OXIDE CHEMISTRY DURING CONSOLIDATION OF Cr/Mn WATER ATOMIZED STEEL POWDER
- 2010Oxide Transformation During Sintering Of Prealloyed Water Atomized Steel Powder
Places of action
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article
Oxide Transformation in Cr-Mn-Prealloyed Sintered Steels: Thermodynamic and Kinetic Aspects
Abstract
The main obstacle for utilization of Cr and Mn as alloying elements in powder metallurgy is their high oxygen affinity leading to oxidation risk during powder manufacturing, handling, and especially during further consolidation. Despite the high purity of the commercially available Cr- and Mn-prealloyed iron powder grades, the risk of stable oxide formation during the sintering process remains. Thermodynamic and kinetic simulation of the oxide formation/transformation on the former powder surface during heating and sintering stages using thermodynamic modeling tools (Thermo-Calc and HSC Chemistry) was performed. Simulation is based on the results from the analysis of amount, morphology, and composition of the oxide phases inside the inter-particle necks in the specimens from interrupted sintering trials utilizing advanced analysis tools (HRSEM + EDX and XPS). The effect of the processing parameters, such as sintering atmosphere composition, temperature profile as well as graphite addition on the possible scenarios of oxide reduction/formation/transformation for Fe-Cr-Mn-C powder systems, was evaluated. Results indicate that oxide transformation occurs in accordance with the thermodynamic stability of oxides as follows: Fe2O3 -> FeO -> Fe2MnO4 -> Cr2FeO4 -> Cr2O3 -> MnCr2O4 -> MnO/MnSiO (x) -> SiO2. Spinel MnCr2O4 was identified as the most stable oxide phase at applied sintering conditions up to 1393 K (1120 A degrees C). Controlled conditions during the heating stage minimize the formation of stable oxide products and produce oxide-free sintered parts.