High temperature multiaxial low cycle fatigue of CMSX-2 Ni-based single crystal superalloy

Article Abstract:

The tension-torsion multiaxial low cycle fatigue of CMSX-2 Ni-based single crystal superalloy was investigated. Tension-torsion low cycle fatigue tests were conducted at 1173K utilizing CMSX-2 hollow cylinder specimens aligned with the 001 axis. Several multiaxial strain and stress parameters were applied to the experimental data to analyze the applicability of the parameters to life prediction. Discrepant data correlation with the strain parameters resulted from the anisotropic stress response due to the crystallographic texture. However, Mises stress and the equivalent stress based on crack opening displacement provided a satisfactory data correlation.

Fatigue (Materials), Materials

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High temperature low cycle fatigue and cyclic constitutive relation of MAR-M247 directionally solidifed superalloy

Article Abstract:

An experiment was conducted to determine the cyclic constitutive relation and low cycle fatigue life of the directionally solidified superalloy Mar-M247/LC(2-4). Results show that solidification direction affects low cycle fatigue life. Specimens whose axes follow the solidification direction show maximum fatigue strength while those that do not display minimum fatigue life. The cyclic-stress relation is elastic and can be determined using the anisotropy of Young's modulus.

Testing

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Elastic anistropy of directionally solidified superalloy

Article Abstract:

Coaxis and non-coaxes models were used to determine elastic compliance and Young's modulus of directionally solidified plates. For both models, computation of Young's modulus, shear modulus and Poisson's ratio is obtained from a compliance matrix based on the finite element method (FEM) analysis. Young's modulus was also computed using the Reuss and Voight averages. Results show that the Reuss average is better since it is closer to the FEM value.

Plates (Engineering), Metal plates (Building materials), Elasticity

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