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Laboratory study on the formation of Al2O3 inclusions at the on-set of deoxidation and during reoxidation

Frontiers of Materials Science 2011年第1期5卷 69-76页

作者： Marie-Aline VAN ENDE Muxing GUO Bart BLANPAIN patrick wollants Department of Metallurgy and Materials Engineering Katholieke Universiteit Leuven Kasteelpark Arenberg 44- bus 2450 BE-3001 Leuven Belgium Unite d＇lngeniede des Materiaux et des Procedes Universite Catholique de Louvain Place Sainte Barbe 2 B-1348 Louvain-la-Neuve Belgium

The formation of Al2O3 inclusions in liquid iron has been investigated in a resistance heated tube furnace to obtain deoxidation and reoxidation related data. The formation of inclusions during the early stages of deoxidation was simulated by bringing a piece of AI in contact for a short time with liquid Fe containing different dissolved oxygen levels. Reoxidation was studied by exposing AI containing Fe melts to a CO/CO2 atmosphere, Through modeling, an estimate of the local and time-dependent growth conditions for the inclusions can be made and linked to the inclusion characteristics.

关键词： steel cleanliness Al2O3 inclusions deoxidation reoxidation morphology

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Computer-Aided Design of Some Advanced Steels and Cemented Carbides

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Journal of Iron and Steel Research International 2005年第6期12卷 42-48页

作者： LI Lin ZHANG Mei HE Yan-lin De Cooman Bruno wollants patrick Shanghai University Shanghai 200072 China Katholieke Universiteit Leuven Leuven 13-3001 Belgium Universiteit Gent Zwijnaarde 13-9052 Belgium

Thermodynamic and kinetic study on TRIP （transformation induced plasticity） steels, cemented carbides and mold steel for plastics were carried out in order to design modern advanced materials. With the sublattice model, equilibrium compositions of ferrite and austenite phases in TRIP steels, as well as volume fraction of austenite at inter-critical temperatures for different time were calculated. Concentration profiles of carbon, manganese, aluminum and silicon in the steels were also estimated in the lattice fixed frame of reference. The effect of Si and Mn on TRIP was discussed according to thermodynamic and kinetic analyses. In order to understand and produce the graded nanophase structure of cemented carbides, miscellaneous phases in the M-Co-C （M= Ti, Ta, Nh） systems and Co-V-C system were modeled. Solution parameters and thermodynamic： properties were listed in detail. The improvement of machining behavior of prehardened mould steel for plastics was obtained by computer-aided composition design. The results showed that the matrix composition of large-section prehardened mould steel for plastic markedly influences the precipitation of non-metallic inclusion and the composition control by the aid of Thermo-Calc software package minimizes the amount of detrimental oxide inclusion. In addition, the modification of calcium was optimized in composition design.

关键词： computer-aided composition design TRIP steel cemented carbide prehardened mould steel concentration profile thermodynamic kinetic equilibrium composition

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Thermal Stability of Retained Austenite in TRIP Steel After Different Treatments

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Journal of Iron and Steel Research International 2008年第1期15卷 61-64页

作者： SHI Wen LI Lin Bruno C De Cooman patrick wollants YANG Chun-xia Department of Material Science and Engineering Shanghai University Shanghai 200072 China Laboratory for Iron and Steel Making Department of Material Science and Engineering Technologiepark 903 BE-9052 Ghent Belgium Department MTM KU Leuven Heverlee B-3001 Belgium

Thermal decomposition of retained austenite in TRIP steel was investigated by means of differential scanning calorimetry（DSC）.The decomposition curve was abnormal,and the decomposition temperature and the activation energy were measured by the Kissinger method,which were all higher than those in quenched *** thermal decomposition data of samples soaked in liquid nitrogen after TRIP treatment were all similar to those without additional low temperature *** indicated that there is a high thermal stability in retained austenite of the TRIP steel at low temperature,which was also proved by XRD analysis.

关键词： TRIP steel retained austenite thermal stability differential scanning calorimetry

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Microstructural Evolution of Slags during EAF Stainless Steelmaking

Microstructural Evolution of Slags during EAF Stainless Stee...

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技术创新与循环经济——第二届宝钢学术年会

作者： Dirk DURINCK Peter Tom JONES Frederik VERHAEGHE Heylen Gert Hendrickx Roel Baeten Rik Blanpain Bart wollants patrick Department of Metallurgy and Materials Engineering Katholieke Universiteit LeuvenKasteelpark Arenberg 44BE-3001 Heverlee(Leuven)Belgium

This paper investigates the microstructural evolution of stainless steelmaking slags during the electric arc furnace process.36 austenitic heats were sampled at 5 distinct *** probe microanalysis with energy dispersive spectroscopy(EPMA-EDS) was used to assess the *** microstructural data show that at high temperature the slag consists of a liquid slag matrix,*** different types of metallic particles and MgO(Cr,Al)O based spinel *** illustrate the effect of changing conditions on the slag microstructure, the interactions between these phases are *** calculations are used as a complementary *** is drawn to the implications of the slag microstructure on slag foaming and Cr recovery.

关键词： EAF steelmaking slag tnicrostructure spinel particles slag basicity Cr recovery

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