Effect of orientation on crystallographic cracking in notched nickel-base superalloy single crystal subjected to far-field cyclic compression |
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| Authors: | P B Aswath |
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| Affiliation: | (1) Mechanical and Aerospace Engineering Department and the Materials Science and Engineering Program, the University of Texas at Arlington, 76019 Arlington, TX |
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| Abstract: | The effects of crystallographic orientation on the fatigue crack initiation and growth under far-field cyclic compression
are discussed in single crystals of nickel-base superalloy MAR-M200. Results indicate that cracking occurs primarily due to
planar slip on the {111}-type planes. Crystallographic cracking can occur on two or more slip planes simultaneously, but through-thickness
cracks are not observed. In addition, it has been shown that the threshold stress intensity for crack initiation shows a strong
dependence on orientation. The threshold stress intensity for crack growth in cyclic compression is 5 to 10 times the threshold
for crack growth in cyclic tension. |
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