Imperial College London
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DrJunJiang

Faculty of Engineering, Department of Mechanical Engineering

Senior Lecturer
 
 
 
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Contact

 

jun.jiang

 
 
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Location

 

523City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhang:2015:10.1016/j.msea.2015.06.070,
author = {Zhang, T and Jiang, J and Shollock, BA and Ben, Britton T and Dunne, FPE},
doi = {10.1016/j.msea.2015.06.070},
journal = {Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing},
pages = {328--339},
title = {Slip localization and fatigue crack nucleation near a non-metallic inclusion in polycrystalline nickel-based superalloy},
url = {http://dx.doi.org/10.1016/j.msea.2015.06.070},
volume = {641},
year = {2015}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Fatigue crack nucleation at a non-metallic agglomerate inclusion has been studied by high spatial resolution Digital Image Correlation (HR-DIC) and high angular resolution Electron Backscatter Diffraction (HR-EBSD). Spatial and temporal characterization and correlation of deformation with underlying microstructures has been performed, with distributions of plastic strain measured from HR-DIC; and residual stress and density of geometrically necessary dislocations (GND) measured from HR-EBSD. Initial residual stress and GND fields, as a consequence of differing thermal expansivities in the metallic and oxide phases, localized around the agglomerate have been quantified using HR-EBSD. The localization of the pre-existing stress and dislocation states appear to lead to early onset of plasticity upon subsequent mechanical loading. Heterogeneous distributions of plastic strain have been observed in the course of the fatigue test by HR-DIC. Crack nucleation via agglomerate/nickel interface decohesion and particle fracture has been demonstrated and this is correlated with the elevation in strain and dislocation density. The measurements of residual stress, strain, and dislocation density provide key information for the mechanisms of fatigue cracking and the development of damage nucleation criteria in these material systems.
AU  - Zhang,T
AU  - Jiang,J
AU  - Shollock,BA
AU  - Ben,Britton T
AU  - Dunne,FPE
DO  - 10.1016/j.msea.2015.06.070
EP  - 339
PY  - 2015///
SN  - 1873-4936
SP  - 328
TI  - Slip localization and fatigue crack nucleation near a non-metallic inclusion in polycrystalline nickel-based superalloy
T2  - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
UR  - http://dx.doi.org/10.1016/j.msea.2015.06.070
UR  - http://hdl.handle.net/10044/1/25913
VL  - 641
ER  -
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