Microstructural study of multiaxial low cycle fatigue
This paper discusses the relationship between the stress response and the microstructure under tension-torsion multiaxial proportional and nonproportional loadings. Firstly, this paper discusses the material dependency of additional hardening of FCC materials in relation with the stacking fault en...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2015-07-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_36.pdf |
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| Summary: | This paper discusses the relationship between the stress response and the microstructure under
tension-torsion multiaxial proportional and nonproportional loadings. Firstly, this paper discusses the material
dependency of additional hardening of FCC materials in relation with the stacking fault energy of the materials.
The FCC materials studied were Type 304 stainless steel, pure copper, pure nickel, pure aluminum and 6061
aluminum alloy. The material with lower stacking fault energy showed stronger additional hardening, which was
discussed in relation with slip morphology and dislocation structures. This paper, next, discusses dislocation
structures of Type 304 stainless steel under proportional and nonproportional loadings at high temperature. The
relationship between the microstructure and the hardening behavior whether isotropic or anisotropic was
discussed. The re-arrangeability of dislocation structure was discussed in loading mode change tests.
Microstructures of the steel was discussed in more extensively programmed multiaxial low cycle fatigue tests at
room temperature, where three microstructures, dislocation bundle, stacking fault and cells, which were
discussed in relation with the stress response. Finally, temperature dependence of the microstructure was
discussed under proportional and nonproportional loadings, by comparing the microstructures observed at
room and high temperatures. |
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| ISSN: | 1971-8993 1971-8993 |