Micromechanism of cyclic plastic deformation of alloy IN 718 at 600°C
IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur
View Archive Info| Field | Value | |
| Title |
Micromechanism of cyclic plastic deformation of alloy IN 718 at 600°C
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| Creator |
Banerjee, A
Sahu, J K Paulose, N Fernando, C D Ghosh, R N |
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| Subject |
Materials Charcterization
Structural Properties |
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| Description |
In the present investigation, an attempt was made to understand the cyclic deformation micromechanism of gas turbine alloy Inconel 718 at 600 °C (i) by conducting low cycle fatigue and creep–fatigue interaction tests and (ii) by studying the microstructure evolution
in the material during fatigue tests through extensive electron microscopy. Bilinear slope was obtained in the Coffin–Manson plot for all low cycle fatigue tests, and it was confirmed through transmission electron microscopic examination that microtwinning
was the predominant mode of deformation at low plastic strain values, whereas slip and shearing of γ″ precipitates were the predominant mode of deformation at higher plastic strain values. Fatigue life was adversely affected when hold time was introduced at peak
tensile strain during creep–fatigue interaction tests. Formation of stepped interface at microtwin boundaries and coarsening of niobium carbide precipitates were observed to be the major microsturctural changes during creep–fatigue interaction tests.
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| Publisher |
Blackwell Publishing
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| Date |
2016
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://eprints.nmlindia.org/7423/1/FFEMS.pdf
Banerjee, A and Sahu, J K and Paulose, N and Fernando, C D and Ghosh, R N (2016) Micromechanism of cyclic plastic deformation of alloy IN 718 at 600°C. Fatigue & Fracture Of Engineering Materials And Structures, 39(7) (IF-2.335). pp. 877-885. |
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| Relation |
http://onlinelibrary.wiley.com/doi/10.1111/ffe.12406/abstract
http://eprints.nmlindia.org/7423/ |
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