Imperial College London
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Dr Minh-Son (Son) Pham

Faculty of Engineering, Department of Materials

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 9529son.pham Website

 
 
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Location

 

B301FBessemer BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Williams:2021:10.1016/j.addma.2020.101706,
author = {Williams, RJ and Al-Lami, J and Hooper, PA and Pham, M-S and Davies, CM},
doi = {10.1016/j.addma.2020.101706},
journal = {Additive Manufacturing},
pages = {1--11},
title = {Creep deformation and failure properties of 316 L stainless steel manufactured by laser powder bed fusion under multiaxial loading conditions},
url = {http://dx.doi.org/10.1016/j.addma.2020.101706},
volume = {37},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 316 L stainless steel has long been used in high temperature applications. As a well-established laser powder bed fusion (LPBF) alloy, there are opportunities to utilise additive manufacturing in such applications. However, the creep behaviour of LPBF 316 L under multiaxial stress conditions must first be quantified before such opportunities are realised. Uniaxial and double notched bar creep tests have been performed and characterised using power-law relations to evaluate the creep strain and rupture properties of LPBF 316 L. The creep response was found to be anisotropic with specimen build orientation, with samples loaded perpendicular to the build direction (Horizontal) exhibiting 8 times faster minimum creep rates than samples built parallel to the build direction (Vertical) and significantly shorter rupture lives. This was mainly attributed to the columnar grain structure, which was aligned with the build direction of the LPBF samples. The multiaxial creep rupture controlling stress was determined and found to be a combination of the equivalent and max. principal stress. X-Ray CT measurements in selected samples illustrated that the samples were approximately 99.6% dense post-build and the quantity of damage post testing was determined. Optical and EBSD microstructural characterisation revealed intergranular creep damage present in the specimens, however rupture was ultimately trans-granular in nature and influenced by the presence and orientation of pre-existing processing defects relative to the sample build and loading direction.
AU  - Williams,RJ
AU  - Al-Lami,J
AU  - Hooper,PA
AU  - Pham,M-S
AU  - Davies,CM
DO  - 10.1016/j.addma.2020.101706
EP  - 11
PY  - 2021///
SN  - 2214-8604
SP  - 1
TI  - Creep deformation and failure properties of 316 L stainless steel manufactured by laser powder bed fusion under multiaxial loading conditions
T2  - Additive Manufacturing
UR  - http://dx.doi.org/10.1016/j.addma.2020.101706
UR  - https://www.sciencedirect.com/science/article/pii/S2214860420310782?via%3Dihub
UR  - http://hdl.handle.net/10044/1/85319
VL  - 37
ER  -
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