34 research outputs found
Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy
The microstructural stability of nickel-based superalloys is critical for maintaining alloy performance during service in gas turbine engines. In this study, the precipitate evolution in a model polycrystalline Ni-based superalloy during aging to 1000 hours has been studied via transmission electron microscopy, atom probe tomography and neutron diffraction. Variations in phase composition and precipitate morphology, size and volume fraction were observed during aging, whilst the constrained lattice misfit remained constant at approximately zero. The experimental composition of the γ matrix phase was consistent with thermodynamic equilibrium predictions, whilst significant differences were identified between the experimental and predicted results from the γʹ phase. These results have implications for the evolution of mechanical properties in service and their prediction using modeling methods.The authors wish to acknowledge Mrs. S. Rhodes, Dr. H.T. Pang, Dr. D.M. Collins, and Dr. O.M.D.M. Messé for their assistance with the experiments performed. Funding was provided by the EPSRC/Rolls-Royce Strategic Partnership under EP/M005607/1 and EP/H022309/1. The Oxford Atom Probe facility was funded by the EPSRC under EP/M022803/1. Neutron diffraction beam time was supported through the Canadian Neutron Beam Centre under Experiment number 1258
Creep of tin dispersion hardened 20%Cr-25%Ni stainless steel below the transition stress
Creep rupture properties of oxidised 20%Cr austenitic stainless steels
SIGLEAvailable from British Library Document Supply Centre- DSC:7761.0385(RD/B--6143/R89) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Comments on ‘The use of geometrical parameters in the theory of interphase interfaces’
Primary creep of TiN dispersion hardened 20%Cr-25%Ni stainless steel at 160 MPa and 1123 K—I. Deformation behaviour
Creep rupture properties of oxidised 20%Cr austenitic stainless steels
SIGLEAvailable from British Library Document Supply Centre- DSC:7761.0385(RD/B--6143/R89) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Primary creep of Zircaloy 4 in the temperature range 923-1073K
SIGLEAvailable from British Library Document Supply Centre- DSC:3106.13384(TPRD/B--0743/R86)(fiche) / BLDSC - British Library Document Supply CentreGBUnited Kingdo