Conception de nouveaux superalliages MdP base nickel pour disques de turbines

Abstract : In order to upgrade the SNECMA M88 engine, new specifications were issued for the material of the parts that are currently made by forging and machining N18 superalloy, including, essentially, turbine discs. This study focuses on the development of new Nickel base polycrystalline superalloys which meet these specifications, i.e. which generally exhibit mechanical properties and microstructural stability better than that of alloy N18, in spite of a significant reduction of the γ' volume fraction. Refering to the state of the art on the specific role of each of the various alloying elements and of heat treatments on the microstructural and mechanical characteristics of the superalloys, new compositions are explored. The microstructures of these experimental alloy compositions are analysed. Tensile, creep and crack propagation tests are performed in order to compare the properties of these new alloys with those of reference, industrially used, superalloys. Among the evaluated alloys, those exhibiting a remarkable tensile and creep resistance were examined by transmission electron microscopy in order to identify the various deformation mechanisms: an interpretation of the outstanding resistance to deformation is presented.
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Submitted on : Thursday, June 21, 2012 - 10:33:45 AM
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  • HAL Id : pastel-00710579, version 1

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Isabelle Augustins-Lecallier. Conception de nouveaux superalliages MdP base nickel pour disques de turbines. Matériaux. École Nationale Supérieure des Mines de Paris, 2011. Français. ⟨NNT : 2011ENMP0086⟩. ⟨pastel-00710579⟩

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