Surface Slip Deformation Characteristics of Nickel-Base Single Crystal Thin Plates With Film Cooling Holes

Zhang, Dongxu; He, Jinyang; Ji, Liang; Zhang, He

doi:10.1109/access.2020.2989034

Cited by 5 publications

(1 citation statement)

References 31 publications

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“…Therefore, the cooling hole cracks in nickel-based single-crystal alloy thin films mainly follow the above slip bands. Zhang et al [28] investigated the distribution of slip bands and activation of slip systems on the free surface of nickel-based single-crystal thin plates with dense film-like cooling holes. By determining the critical shear stress of each slip system exceeding DD6, the slip bands extended along the [011] and [011] directions activated by 111 , 111 , 111 , (111) slip planes, and cracks extended on the slip planes to form fracture planes.…”

Section: Activation Of Slip Systems With Different Orientationsmentioning

confidence: 99%

Numerical Simulation of the Residual Stress at the Interface between Thermal Barrier Coating and Nickel-Based Single-Crystal Superalloy Based on Crystal Plasticity Theory

Liu,

Wang,

Yang

et al. 2023

Coatings

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Residual stress plays an important role in the formation and growth of cracks in thermal barrier coatings and single-crystal superalloy substrates. In this study, a finite element model for a planar double-layer thermal barrier coating and a crystal plasticity finite element model based on dislocation slip-induced plastic deformation of single-crystal materials were established to analyze the residual stress in the coatings and the substrate, considering the creep and crystal plasticity of the substrate materials. The simulation results show that the thermal barrier coatings bear most of the stress generated by high temperatures, and the residual stress of the substrate is small. By comparing the two material properties to calculate the interface stress when the amplitude of the interface between the substrate and the coating is 30 μm and the thickness of the thermal grown oxide layer is 5 µm, the interfacial stress of the substrate at the macro scale was found to be similar to the interfacial stress at the micro slip system scale. Based on the cumulative shear strain, it was determined that the [001]-, [011]-, and [111]-oriented alloys activated the 12, 8, and 4 groups, respectively, under the combined action of thermal stress and centrifugal force of the coating. Comparing the activation of different initial orientation slip systems and the magnitude of the yield stress provides a theoretical foundation to study the structural integrity of single-crystal alloys.

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Section: Activation Of Slip Systems With Different Orientationsmentioning

confidence: 99%