Abstract
In this study, tensile tests at room temperature and observations of slip bands on the free surface of a nickel-based single-crystal thin plate with densely distributed film cooling holes were performed. The deformation of the slip system at the edge of the cooling hole and between the holes was analyzed. Numerical simulation predictions were conducted based on the plasticity theory of crystals, and the comparison with the experimental results showed good consistency. Based on the simulation and experimental results, the nucleation and propagation direction of the edge cracks were analyzed by means of crystallography. The results showed that the fracture surface was mainly attributed to slipping, and the slip traces were approximately in two directions, namely [011] and [01-1], both of which were 45° to the stress axis. The maximum values of the resolved shear stress around the cooling hole were attained at 82.5°, 112.5°, 247.5°, and 277.5°, which corresponded to τ 2 , τ 8 , τ 10 , and τ 6 .
Highlights
In actual working conditions, turbine blades are often subjected to the combined effects of centrifugal force and thermal stress
Combined with the crystal plasticity theory, a numerical simulation of the model was performed, whose results were compared with the experimental observations
We can see that due to the multi-hole interference effect between each hole, four sets of slip bands symmetrically distributed around each hole, which was the area where the specimen experienced relatively larger stress and strain
Summary
Turbine blades are often subjected to the combined effects of centrifugal force and thermal stress. Previous researchers analyzed the slip band in the deformation process using the three-dimensional elastic anisotropy theory combined with experiments, revealing the plastic evolution law of the double-notched nickel-based single crystal under different random orientations [17]–[21]. Some researchers conducted tensile tests along the [001] orientation on a nickel-based single-crystal sample with a single hole They observed the evolution of stress and strain around the hole, as well as the slip band distribution. Zhou performed room temperature tensile tests on the nickel-based single crystal alloy with a hole in the center along various orientations and observed the strain field distribution of the sample in real-time through the ARAMIS system [29], [30]. Combined with the crystal plasticity theory, a numerical simulation of the model was performed, whose results were compared with the experimental observations
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