Imperial College London
Alternate

ProfessorFionnDunne

Faculty of Engineering, Department of Materials

Principal Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 2884fionn.dunne

 
 
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Location

 

104Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Peng:2016:10.1016/j.msea.2016.08.101,
author = {Peng, Z and Tian, G and Jiang, J and Li, M and Chen, Y and Zou, J and Dunne, FPE},
doi = {10.1016/j.msea.2016.08.101},
journal = {Materials Science and Engineering A},
pages = {441--449},
title = {Mechanistic behaviour and modelling of creep in powder metallurgy FGH96 nickel superalloy},
url = {http://dx.doi.org/10.1016/j.msea.2016.08.101},
volume = {676},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The creep properties of a nickel-based superalloy at 700 °C and 690 MPa resulting from differing aging heat treatments have been investigated. The heat treatments gave rise to significantly different tertiary γ′ precipitate distributions which in turn influence the propensity for precipitate shearing. The creep life was found to decrease with an increase of volume fraction of tertiary γ′. It is shown that the γ′ precipitates undergo shearing by matrix dislocations resulting in residual stacking faults which have been identified from TEM studies.A physically-based crystal slip model for creep deformation in FGH96 has been developed. A critical γ′ precipitate size is found to exist above which precipitate shearing occurs by strongly-coupled dislocations pairs. The critical size for FGH96 superalloy is less than 15 nm, which is smaller than most of the γ′ precipitates in the aged treated samples. A bimodal precipitate hardening model has been presented from which the slip strength resulting from differing heat treatments may be determined. Creep strain rate is found to decrease with increasing slip strength. The crystal slip model successfully captures the effect of heat treatment (in terms of γ′ precipitate distributions) on resulting creep behaviour in alloy FGH96.
AU  - Peng,Z
AU  - Tian,G
AU  - Jiang,J
AU  - Li,M
AU  - Chen,Y
AU  - Zou,J
AU  - Dunne,FPE
DO  - 10.1016/j.msea.2016.08.101
EP  - 449
PY  - 2016///
SN  - 0921-5093
SP  - 441
TI  - Mechanistic behaviour and modelling of creep in powder metallurgy FGH96 nickel superalloy
T2  - Materials Science and Engineering A
UR  - http://dx.doi.org/10.1016/j.msea.2016.08.101
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000384853000051&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/42400
VL  - 676
ER  -
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