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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外文摘要：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 results.Furthermore,the CP-FEM results for the crack initiation direction on(1(1)1)dominant slip plane were consistent with the in situ SEM observations.

外文关键词：

in-situ SEM-DICNi-based SC superalloysmicrostructural raftingdeformationcrack pathCP-FEM

作者：

TAN Long、YANG XiaoGuang、SHI DuoQi、FAN YongSheng、SHI Yi

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作者单位：

School of Energy and Power Engineering,Beihang University,Beijing 102206,China

Research Institute of Aero-Engine,Beihang University,Beijing 102206,China

National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics,Beihang University,Beijing 102206,China

School of Materials Science & Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Science and Technology Major Project of ChinaScience Center for Gas Turbine ProjectAcademic Excellence Foundation of BUAA for PhD Students

项目编号：

Grant Nos.5220513912172021521051562019-Ⅳ-0017-0085P2022-Ⅲ-003-002

出版年：

2024

DOI：

10.1007/s11431-023-2554-1

中国科学:技术科学(英文版)

中国科学院

中国科学:技术科学(英文版)

CSTPCDEI

影响因子：1.056

ISSN：1674-7321

年,卷(期)：2024.(7)

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