5 research outputs found

    Characterisation of High Temperature Oxidation Phenomena during AISI 430 Stainless Steel Manufacturing under a Controlled H-2 Atmosphere for Bright Annealing

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    Localised-in-the-edge oxidation of four AISI 430 alloys was investigated after an industrial bright annealing process. The oxidised surface of each specimen was characterised by X-ray photoelectron spectroscopy (XPS), Raman-spectroscopy and SEM. The results showed that the selective oxidation of Cr and Mn took place at the coil edges of AISI 430. This led to the formation of an oxide scale based on Cr2O3 and MnCr2O4. On the other hand, the formation of Cr(OH)(3) and MnOOH in the outer part of the oxide scale was related to the effect of the H-2-N-2 environment on the annealing furnace. The results concluded that the composition of Cr and Mn in the alloy determined the composition of the oxidation products. However, the effect of annealing time was minor in this oxidation mechanism, which slightly contributed to an increase in the cation diffusion from the steel to the oxide. Finally, the results obtained indicate that the colouration of the coil edges displayed in each studied material varies according to the alloy chemical composition and annealing time.This research was funded by the "Proyectos de I+D Individuales" programme, Centro para el Desarrollo Tecnologico Industrial (CDTI), Ministerio de Economia y Competitividad from the Spanish Government-project "FERRINOP"

    Analysis of oxide scales on oxidised EN 1.4509 ferritic stainless steel catalyst support by scanning electron microscopy

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    This study aims to investigate the oxidation behaviour at high temperature of a commercial ferritic stainless steel EN 1.4509. Tests of high temperature oxidation in air were carried out under isothermal condition (950 ÂșC) with different exposure times in order to obtain the oxidation kinetics law associated to this material. The surface and cross-section were analysed by scanning electron microscopy and energy-dispersive X-ray spectrometry (SEM/EDS), where the oxide scales proved to be formed by an external Mn-Cr spinel and an inner chromia layer. These oxides were generated by the migration of metallic cations from the stainless steel to the atmosphere. The size of the generated spinel crystals increased when increasing the exposure time as well as the cross-section thickness did. Moreover, the surface modification of ferritic stainless steel EN1.4509 was studied when platinum is deposited on its surface. The feature of this surface-modified ferritic stainless steel against oxidative atmosphere was evaluated by SEM/EDS. This platinum deposition led to reach a different surface morphology in terms of crystal size and nature.Peer reviewe

    Challanges in Steel Science & Technology

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    Ponencias de WorkShop Advanced Steels 2014. Challenges in Steel Science & Technology. Celebrado en la central del CSIC, c/Serrano, 17, del 18 y 10 de septiembre de 2014.Organizado por: CENIM-CSIC, ASCO Industries (Fr), ASM Spain Chapter (Es), CTM (Es).Advanced Steels 2014 Workshop was intended to be an open dialogue to discuss the potential and plausibility of new alloy and processing strategies that are currently being explored in the modern steel industry. In addition, fundamental investigation on advanced and complex steel structures will shed novel light on the applicability of theory, modeling and advanced techniques on the design of these kinds of materialsComunicaciones: 1.Ulrich Prahl, Phase field modeling of bainite. 2. María Jesus Santofimia, Q&P theory. 3.Vicky Yardley, Orientation relationships and morphology in fcc-bct martensitic transformations: phenomenological theory and EBSD investigations. 4.Elisabeth Gautier, Bainite/martensite transformation under stress. 5. Cem Tasan, Multi-scale characterization of ductile martensitic stainless steels. 6. Peter Hedström, On the three-dimensional microstructure of martensite in C steels. 7. David San Martín, Sub-micrometer austenite obtained by controlled heat treatments: microstructure and mechanical properties. 8. Roumen Petrov, Advanced EBSD characterization in AHS steels. 9. José A. Jiménez, Advanced X-ray diffraction study in modern steels. 10. Juan F. Almagro Bello, Advance characterization of high-strength stainless steels. 11. Isabel Gutiérrez, Effect of microstructure of the impact toughness of HSS. 12. Daniel Casellas, Fracture toughness of high strength steels sheets: an approach to understand formability and crack edge fracture in cold forming. 13. Eberhard Kerscher, The fatigue limit of high-strength bearing steels. 14. Ilchat Sabirov, Fatigue and fracture. 15. Iñaki García, Wear behavior of HSS in discontinuous sliding contact conditions. 16. John Hald, Creep resistant martensitic/bainitic steels. 17. Pedro Rivera, Hydrogen embrittlement in complex microstructures. 18. Lars-Erik Svensson, Welding of modern bainitic/martensitic steels. 19. Sybrand van der Zwaag, Alloy design based on thermodynamics, metallurgical principles and genetic algorithms. 20. Thomas Sourmail, Air cooled bainitic steel design through tailoring of the transformation kinetics. 21. Zuriñe Idoyaga Olano, Development of new steel grades with improved mechanical properties by the addition of nanoparticles. 22. Marion Bechtold, Novel concepts for improving formability in steels for the automotive industry. 23. José Arancón, Advanced rail steels. 24. Jan Post, Multi-stage forming in stainless steels. 25. María M. Aranda, Thermodynamics and kinetics of eutectoid transformation in a Fe-C-Mn alloy: constant pearlite vs divergent pearlite.N

    B. Sprachwissenschaft.

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    Dulaglutide and cardiovascular outcomes in type 2 diabetes (REWIND): a double-blind, randomised placebo-controlled trial

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