Effect of local anisotropy on fatigue crack initiation in a coarse grained nickel-base superalloy
In the present work, theoretical approaches, based on grain orientation dependent Young’s modulus and Schmid factor are used to describe the influence of local grain orientation on crack initiation behaviour of the coarse grained nickel base superalloy René80. Especially for strongly anisotropic cry...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2018-01-01
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| Series: | MATEC Web of Conferences |
| Online Access: | https://doi.org/10.1051/matecconf/201816504004 |
| _version_ | 1818603251600195584 |
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| author | Engel Benedikt Beck Tilmann Moch Nadine Gottschalk Hanno Schmitz Sebastian |
| author_facet | Engel Benedikt Beck Tilmann Moch Nadine Gottschalk Hanno Schmitz Sebastian |
| author_sort | Engel Benedikt |
| collection | DOAJ |
| description | In the present work, theoretical approaches, based on grain orientation dependent Young’s modulus and Schmid factor are used to describe the influence of local grain orientation on crack initiation behaviour of the coarse grained nickel base superalloy René80. Especially for strongly anisotropic crystal structures with large grain size, such as the investigated material, the local elastic properties must be taken into account for assessment of fatigue crack initiation. With an extension of Schmid’s law, the resulting shear stress amplitude, which triggers local cyclic plastic deformation, can be calculated depending on local Young`s modulus and Schmid factor. A Monte Carlo simulation with 100,000 samples shows how random grain orientation affects these parameters. Furthermore, the product of Young`s modulus and Schmid factor (called E·m) is used as a parameter to determine how grain orientation influences resulting shear stress amplitude for given total strain amplitude. In addition to the theoretical work using that approach, this model is also validated using isothermal LCF experiments by determining local grain orientation influence on the crack initiation site using SEM-EBSD analyses. |
| first_indexed | 2024-12-16T13:20:12Z |
| format | Article |
| id | doaj.art-58fc7f93b3464c8fbc807bd6677b178f |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-12-16T13:20:12Z |
| publishDate | 2018-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj.art-58fc7f93b3464c8fbc807bd6677b178f2022-12-21T22:30:22ZengEDP SciencesMATEC Web of Conferences2261-236X2018-01-011650400410.1051/matecconf/201816504004matecconf_fatigue2018_04004Effect of local anisotropy on fatigue crack initiation in a coarse grained nickel-base superalloyEngel BenediktBeck TilmannMoch NadineGottschalk HannoSchmitz SebastianIn the present work, theoretical approaches, based on grain orientation dependent Young’s modulus and Schmid factor are used to describe the influence of local grain orientation on crack initiation behaviour of the coarse grained nickel base superalloy René80. Especially for strongly anisotropic crystal structures with large grain size, such as the investigated material, the local elastic properties must be taken into account for assessment of fatigue crack initiation. With an extension of Schmid’s law, the resulting shear stress amplitude, which triggers local cyclic plastic deformation, can be calculated depending on local Young`s modulus and Schmid factor. A Monte Carlo simulation with 100,000 samples shows how random grain orientation affects these parameters. Furthermore, the product of Young`s modulus and Schmid factor (called E·m) is used as a parameter to determine how grain orientation influences resulting shear stress amplitude for given total strain amplitude. In addition to the theoretical work using that approach, this model is also validated using isothermal LCF experiments by determining local grain orientation influence on the crack initiation site using SEM-EBSD analyses.https://doi.org/10.1051/matecconf/201816504004 |
| spellingShingle | Engel Benedikt Beck Tilmann Moch Nadine Gottschalk Hanno Schmitz Sebastian Effect of local anisotropy on fatigue crack initiation in a coarse grained nickel-base superalloy MATEC Web of Conferences |
| title | Effect of local anisotropy on fatigue crack initiation in a coarse grained nickel-base superalloy |
| title_full | Effect of local anisotropy on fatigue crack initiation in a coarse grained nickel-base superalloy |
| title_fullStr | Effect of local anisotropy on fatigue crack initiation in a coarse grained nickel-base superalloy |
| title_full_unstemmed | Effect of local anisotropy on fatigue crack initiation in a coarse grained nickel-base superalloy |
| title_short | Effect of local anisotropy on fatigue crack initiation in a coarse grained nickel-base superalloy |
| title_sort | effect of local anisotropy on fatigue crack initiation in a coarse grained nickel base superalloy |
| url | https://doi.org/10.1051/matecconf/201816504004 |
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