Micromechanism of cyclic plastic deformation of alloy IN 718 at 600°C

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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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.

Item Type:Article
Official URL/DOI:http://onlinelibrary.wiley.com/doi/10.1111/ffe.124...
Uncontrolled Keywords:creep–fatigue interaction; IN 718; low cycle fatigue; microtwinning; slip bands
Divisions:Material Science and Technology
ID Code:7423
Deposited By:Dr. J K Sahu
Deposited On:09 Mar 2016 14:41
Last Modified:15 Nov 2017 14:59
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