Grain boundary engineering: fatigue fracture

Das, Arpan (2017) Grain boundary engineering: fatigue fracture. Philosophical Magazine, 97(11) (IF-1.505). pp. 867-916.

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Grain boundary engineering has revealed significant enhancement of material properties by modifying the populations and connectivity of different types of grain boundaries within the polycrystals. The character and connectivity of grain boundaries in polycrystalline microstructures control the corrosion and mechanical behaviour of materials. A comprehensive review of the previous researches has been carried out to understand this philosophy. Present research thoroughly explores the effect of total strain amplitude on phase transformation, fatigue fracture features, grain size, annealing twinning, different grain connectivity and grain boundary network after strain controlled low cycle fatigue deformation of austenitic stainless steel under ambient temperature. Electron backscatter diffraction technique has been used extensively to investigate the grain boundary characteristics and morphologies. The nominal variation of strain amplitude through cyclic plastic deformation is quantitatively demonstrated completely in connection with the grain boundary microstructure and fractographic features to reveal the mechanism of fatigue fracture of polycrystalline austenite. The extent of boundary modifications has been found to be a function of the number of applied loading cycles and strain amplitudes. It is also investigated that cyclic plasticity induced martensitic transformation strongly influences grain boundary characteristics and modifications of the material's microstructure/microtexture as a function of strain amplitudes. The experimental results presented here suggest a path to grain boundary engineering during fatigue fracture of austenite polycrystals.

Item Type:Article
Official URL/DOI:DOI: 10.1080/14786435.2017.1285072
Uncontrolled Keywords:Author Keywords:Grain boundary engineering; low cycle fatigue; austenitic stainless steel; deformation induced martensite; electron backscatter diffraction; grain connectivity
ID Code:7583
Deposited By:Sahu A K
Deposited On:18 Aug 2017 09:53
Last Modified:16 Feb 2018 15:18
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