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Effects of rafting on the meso deformation and fracture behaviour of a ni-based single crystal superalloy at room temperature: In-situ observation and simulation

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science China(Technological sciences) 2024年第7期67卷 2133-2146页

作者： TAN Long YANG XiaoGuang SHI DuoQi FAN YongSheng SHI Yi school of Energy and Power Engineering Beihang UniversityBeijing 102206China Research Institute of Aero-Engine Beihang UniversityBeijing 102206China National Key Laboratory of science and Technology on Aero-Engine Aero-Thermodynamics Beihang UniversityBeijing 102206China school of Materials science&Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Microstructural rafting of ni-based single-crystal(sc) superalloys is inevitable at elevated temperatures during long-term service with mechanical loading, which significantly affects the mechanical behaviour of the material. In this study, the effects of rafting on the mesodeformation and fracture behaviour of a ni-based sc superalloy under cyclic and tensile loads were investigated using in situ scanning electron microscopy(SEM), digital image correlation(DIC), and crystal plasticity finite element method(CP-FEM) simulations. The results indicated that the tensile strength decreased significantly in the rafted specimens. In the cyclic tests, both the virgin and rafted specimens showed an increase in the maximum shear strain with cycle number. The interaction of cross-slip bands was captured by in situ SEM-DIC around the micro-notch of the virgin specimens during the tensile test, while a more homogeneous local deformation field was observed in the rafting specimens. In addition,the fracture behaviour was strongly influenced by the rafting morphology. The crack exhibited instantaneous and long-range fracture features along the octahedral plane as it propagated in the rafting specimen, whereas it deflected over a short distance between the crystallographic planes at an early stage in the virgin specimen, which is consistent with the CP-FEM ***, the CP-FEM results for the crack initiation direction on(111) dominant slip plane were consistent with the in situ SEM observations.

关键词： in-situ SEM-DIC ni-based sc superalloys microstructural rafting deformation crack path CP-FEM

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