Heat treatments of aeronautical turbine disks produced by powder metallurgy include y' solutionning, quenching and subsequent annealing. In the present work, the intragranular y' precipitation kinetics during the quench has been followed by dilatometry and transmission electron microscopy. The precipitation steps are studied on specimens "hyperquenched" from selected temperatures during a simul...

A transpiration cooled flat plate configuration is investigated numerically by application of a 3-D conjugate fluid flow and heat transfer solver, CHT-Flow. The geometrical setup and the fluid flow conditions are derived from modern gas turbine combustion chambers. The plate is composed of three layers, a substrate layer (CMSX-4) with a thickness of 2 mm, a bondcoat (MCrAlY) with a thickness 0,...

Ni-based single crystal (SX) superalloy with low specific weight is vital for developing aero engines a high strength-to-weight ratio. Based on an alloy system 3 wt.% Re but without W, namely Ni-Co-Cr-Mo-Ta-Re-Al-Ti, below 8.4 g/cm3 has been achieved. To reveal the relationship among composition, mechanical properties, and thermal stability of SX superalloys, SXs desirable microstructures are f...

The formation of pores in CMSX-4 nickel based superalloys is detrimental to the service life material. A way avoid problem treat under Hot Isostatic Pressing (HIP), which enables a large volume fraction be annihilated. This paper aims understand contribution plastic activity related gliding dislocations on pore annihilation. Simulations phase-field model dislocation are performed and make it po...

Low-sulfur single-crystal Ni-base superalloys have demonstrated excellent cyclic oxidation resistance due to improved Al2O3 scale adhesion. This derives from preventing deleterious interfacial sulfur segregation that occurs at common ppm levels of S impurity. Multiple hydrogen-annealing desulfurization treatments were employed produce a continuum demonstrating this oxidative transition, using 1...

The present work deals with crystal plasticity of single crystal nickel-base superalloys. In this context, a scale transition of transferring information from mesoscale towards a physically justified micromechanical model is shown. A numerical coupling between dislocation dynamic simulations and the finite element method, the socalled Discrete-Continuous Model (DCM) is used in order to take int...