Local Strain Accommodation in Polycrystalline Ni-Base Superalloys

摘要: To exploit new hybrid nickel-based superalloys, physics-based computational models are needed to predict material properties and describe behavior during exposure complex life cycles. Such will allow an iterative assessment of microstructural morphology as related mechanical prior production large-scale test specimens or components, thereby reducing development time cost. Development these is currently hindered by a gap in the understanding local deformation at intra- intergranular level. A in-situ experimental methodology being developed characterize strain heterogeneities superalloys that have relatively fine grain size (dave<50μm). Initial work has been performed on Rene 104 was heat treated produce two sets samples with similar but different γ’ distributions boundary morphologies. One sample set had planar boundaries bimodal distribution, other serrated trimodal distribution. Progress made towards implementation suitable speckle pattern for digital image correlation (DIC). Quasi-isostatic room temperature tensile tests were scanning electron microscope, images acquired regular intervals. This preliminary data qualitatively analyzed using Correlated Solutions VIC-2D software. The indicates there indeed interesting orientations, relationships axis boundaries.