Objective
This project is concerned with research and development in a new class of advanced engineering materials, high nitrogen steels (HNS), which has emerged during the last decade. Alloying with nitrogen is used to reach an exceptional combination of high strength and corrosion resistance. Applications are already in place in power generation, the aircraft industry, transport systems, biomaterials and the petrochemical industry.
The aim of this project is to elaborate the physical grounds for the design of HNS and transfer scientific results into application. Three classes of HNS - austenitic, martensitic and duplex - will be studied, and three scales of research -micro, meso and macro - are foreseen. The Institute of Kiev, is responsible for the microscopic studies (electronic structure and distribution of atoms) and mainly deals with austenitic steels. The Laboratory of Lille, studies substructure on the mesoscopic scale grain scale and deals mainly with duplex steels. The University of Bochum, is dealing with macroscopic properties, mechanical behaviour and corrosion resistance and specialises in the field of martensitic nitrogen steels.
The studies will aim to clarify the following questions: the nature of the high thermodynamic stability of HNS; the peculiarities of the phase transformations and the nature of the transformation products; the mechanisms of strengthening by nitrogen; and the nature of the high corrosion resistance of HNS.
As a first step the project will study the electronic structure of the nitrogen containing iron-based solid solutions and nitrides by means of theoretical calculations ab initio and using soft x-ray spectroscopy and electron spin resonance measurements. The second step will model the distribution of the nitrogen atoms in the solid solution using the interatomic bond parameters derived from the studies of the electronic structure and the Monte-Carlo method. The theoretical results will be compared with those of the experimental study of the distribution of nitrogen in solid solutions performed by means of Mössbauer spectroscopy. Interaction of nitrogen atoms with the crystal lattice imperfections will be studied using the internal friction technique. The third step will focus on the peculiarities of the substructure of high nitrogen austenitic, martensitic and duplex steels, phase transformations and structure of precipitations. Studies of mechanical and corrosion properties, development of the concept for design of HNS and experiments with the new advanced HNS will constitute the final fourth step of the studies.
Recommendations for practical applications will be developed on the basis of the fundamental research.
Fields of science (EuroSciVoc)
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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Funding Scheme
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Coordinator
59655 Villeneuve d'Ascq
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.