Imperial College London
Alternate

DrMarkWenman

Faculty of Engineering, Department of Materials

Reader in Nuclear Materials
 
 
 
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Contact

 

+44 (0)20 7594 6763m.wenman

 
 
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Location

 

B301aRoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Gasparrini:2020:10.1016/j.msea.2020.139942,
author = {Gasparrini, C and Xu, A and Short, K and Wei, T and Davis, J and Palmer, T and Bhattacharyya, D and Edwards, L and MRWenman},
doi = {10.1016/j.msea.2020.139942},
journal = {Materials Science and Engineering: A},
title = {Micromechanical testing of unirradiated and helium ion irradiated SA508 reactor pressure vessel steels: Nanoindentation vs in-situ microtensile testing},
url = {http://dx.doi.org/10.1016/j.msea.2020.139942},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - In this paper, microtensile testing is demonstrated to be a viable technique for measuring irradiation hardening and reduction of ductility of ion irradiated hot isostatic pressed SA508 ferritic/bainitic steel. Ion irradiation with He2+ was used as a surrogate for neutron irradiation to reach a damage level of 0.6 dpa (Kinchin-Pease). The mechanical properties of four unirradiated microtensile steel specimens were measured and compared to the bulk properties: when averaged the 0.2% proof stress was 501.6±56.0MPa, in good agreement with the macrotensile 0.2% proof stress of 456.2±1.7MPa. On the basis of the agreement between microtensile and standard tensile 0.2% proof stress in the unirradiated material, it was possible to directly measure irradiation induced hardening from ion irradiation performed with He2+ ions to a dose of 0.6 dpa. Microtensile testing of the ion irradiated steel revealed an increase in 0.2% proof stress of approximately 730MPa. The irradiation hardening measured by nanoindentation was 3.22±0.29GPa. Irradiation hardening was higher than that previously observed in neutron irradiated low alloy steels exposed to similar doses at low temperatures (<100°C). The reason for the higher hardening was related to the presence of fine helium bubbles implanted in the irradiated layer that, alone, was calculated to produce a 707±99MPa increase in yield stress.
AU  - Gasparrini,C
AU  - Xu,A
AU  - Short,K
AU  - Wei,T
AU  - Davis,J
AU  - Palmer,T
AU  - Bhattacharyya,D
AU  - Edwards,L
AU  - MRWenman
DO  - 10.1016/j.msea.2020.139942
PY  - 2020///
SN  - 0921-5093
TI  - Micromechanical testing of unirradiated and helium ion irradiated SA508 reactor pressure vessel steels: Nanoindentation vs in-situ microtensile testing
T2  - Materials Science and Engineering: A
UR  - http://dx.doi.org/10.1016/j.msea.2020.139942
UR  - https://www.sciencedirect.com/science/article/pii/S0921509320310145?via%3Dihub
UR  - http://hdl.handle.net/10044/1/81690
ER  -
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