Material model describing the orientation dependent creep behavior of single crystals based on dislocation densities of slip systems

Brehm, Holger; Glatzel, Uwe

doi:10.1016/s0749-6419(98)00071-0

Cited by 31 publications

(3 citation statements)

References 22 publications

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“…In this approach, slips over octahedral {111} and cubic {001} planes are considered. Brehm et al [19] extended this study by incorporating a precise description of the dislocation densities for the different slip systems and their interactions. MacLachan et al [16] proposed a simplified power-law model with a reduced number of parameters that incorporates the effect of partial 112 shear on the creep rates, which was assumed to be symmetric.…”

Section: Introductionmentioning

confidence: 98%

A thermodynamically consistent constitutive model for diffusion-assisted plasticity in Ni-based superalloys

Barba

Alabort

Garcia‐Gonzalez

et al. 2018

International Journal of Plasticity

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Section: Introductionmentioning

confidence: 98%

A thermodynamically consistent constitutive model for diffusion-assisted plasticity in Ni-based superalloys

Barba

Alabort

Garcia‐Gonzalez

et al. 2018

International Journal of Plasticity

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“…A great quantity of work has been carried out to investigate the influence of orientation and rotation speed on the mechanical property of nickel-base single-crystal superalloys. Many researchers have shown that the creep behavior is strongly dependent on the crystallographic orientation [1][2][3][4]. Several researchers, such as Mackay and Maier and Ghosh et al, have attempted to map the creep-damage behavior of single crystals for all possible orientations.…”

Section: Introductionmentioning

confidence: 99%

Reliability Study for Creep Life of Single Crystal Turbine Blade under Random Crystal Orientations and Random Loads

Gao

Zhu

2010

AMR

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For the single crystal (SC) Ni-based superalloys, it is difficult to avoid orientation variation along airfoil stacking line of the SC turbine blade. At the mean time, the loading of turbine blade is uncertainly during the working. In this work, the creep life of the SC turbine blade is determined by the finite element analysis (FEA) based on the crystal slip theory. The orientation variations are measured based larger numbers commercial turbine blade made of SC superalloys. Furthermore, Monte-Carlo method and the forth moment method are presented to analysis the reliability for creep life of SC turbine blade under random crystal orientations and random loads based on the FEA method. The basic variables sensitivity are comprehensively analyzed by the forth moment method.

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“…The model is then used to analyse the creep deformation of a high-pressure turbine blade to illustrate the effect of the material model and micromechanisms on predictions of component performance. Owing to the continuous requirement for improved deformation and lifing methods for single crystal superalloys, modelling work in this area has now reached an advanced stage with complex models available that can describe dislocation interactions, 3 strain gradient effects, 4 periodic two-phase microstructures 5 as well as viscoplastic anisotropy, and different precipitate morphologies. 6,7 Advances that have incorporated the micromechanisms of slip deformation into finite element (FE) models have improved the predictive capacity of these models.…”

Section: Introductionmentioning

confidence: 99%

The effect of material behaviour on the analysis of single crystal turbine blades: Part I – Material model

MacLachlan

Knowles

2002

Fatigue Fract Eng Mat Struct

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This paper describes a slip system model developed for the analysis of modern single crystal superalloys – specifically, the first generation alloys RR2000 and SRR99, and the second generation alloy CMSX‐4. The single crystal model is implemented as an ABAQUS User MATerial (UMAT) subroutine, the framework is based on the classical theory of single crystal plasticity. The constitutive equations used have different formulations based on the micromechanisms of deformation and experimental measurements. The emphasis is on the effect of incorporating the micromechanisms of material behaviour on predicted macroscopic results. Several important phenomena and mechanisms, which are required for explaining creep properties as a function of stress, temperature and orientation are identified and included in the model. These include: activation of < 101 > {111} and < 112 > {111} slip systems, rigid body rotation, continuum damage, slip system softening, dislocation interaction, threshold behaviour and rafting. Model simulations are compared with experimental data in various deformation regimes. In a later part of the paper, the model is used to analyse the performance of a single crystal turbine blade. This enables the effect of the micromechanisms of deformation on overall component behaviour to be quantified.

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Material model describing the orientation dependent creep behavior of single crystals based on dislocation densities of slip systems

Cited by 31 publications

References 22 publications

A thermodynamically consistent constitutive model for diffusion-assisted plasticity in Ni-based superalloys

A thermodynamically consistent constitutive model for diffusion-assisted plasticity in Ni-based superalloys

Reliability Study for Creep Life of Single Crystal Turbine Blade under Random Crystal Orientations and Random Loads

The effect of material behaviour on the analysis of single crystal turbine blades: Part I – Material model

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