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Content archived on 2024-05-07

New performances of nitrogen cast iron and advanced technologies for their characterization in smes foundries

Objective



Nowadays it is obvious that the specific requirements of materials are improving more and more, in terms of performance, functionality and costs. Regarding more precisely cast iron components, the ability to make new alloys with a higher added value reflecting the quality demanded by the market will be achieved by developing new processes in order to enhance the material performance (i.e. its mechanical and physical properties). She aim of the project is to focuse on lamellar graphite (LG) cast iron which has a key role for a wide range of applications in the foundry industry, such as cylinder liners, block engines, brakes or compressors, and thermal components, etc. As a matter of fact, in this specific case, the effect of nitrogen introduced in LG cast iron will lead to the very favourable effects listed herebelow: - An easier way to reach the limit value of 300 Mpa (Rt) - An increase of the Young's modulus . High thermal diffusity and adequate sliding surface. This technical approach will improve the mechanical behaviour (i.e. stress strain) or the lithtening of the components. Moreover nitrogen contained in LG cast iron will allow to obtain an adequate structure (i.e. pearlitic matrix) without the necessity to use any addition products (such as Cu, Ni and Mo), especially for the duty and thick components. The objectives of the project are (1) to define the evolution law of the strength and the Young's modulus a function of the nitrogen content in LG cast iron, (2) to study the occurrence of nitrogen gas porosity as function of different process criteria surface fension, hydraulic pressure, kinetics , (3) to determine the nitrogen content in LG cast iron through up to date nitrogen probes, and (4) to implement in the SMEs foundries all the optimized procedures/practices regarding the
mainly: - Industrial interest: Strengthening of the mechanical properties of LG cast iron. Lightening of the components. Better knowledge of the gas defect occurence. - Economical interest: Cost reduction due to (i) the improvement of durability and a better response in service, (ii) no use of any alloying elements. Improvement of LG cast iron quality, especially the graphite shape without creating any gas defects. - Environmental and social interest: To increase the metallurgical knowledge of nitrogen when introduced in cast iron. To improve the effective quality assurance system of nitrogen cast iron.

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CRS - Cooperative research contracts

Coordinator

FIDAY GESTION
EU contribution
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Address
Chassey les Scey
70360 SCEY SUR SAONE
France

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Total cost

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Participants (7)

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