TY - GEN
T1 - Investigating the Influence of Build Parameters and Porosity on Fatigue of AM IN718
AU - Caputo, Alexander
AU - Neu, Richard W.
AU - Vallabh, Chaitanya
AU - Zhao, Xiayun
AU - Zhang, Haolin
N1 - Publisher Copyright:
© 2023, The Minerals, Metals & Materials Society.
PY - 2023
Y1 - 2023
N2 - Using laser powder bed fusion additive manufacturing (L-PBF AM), a series of 10 sample walls were made, sectioned into fatigue specimens, and tested using high cycle fatigue (HCF) testing with a stress ratio of 0.1 at 538 °C. Each wall was built with a different process pedigree, or set of process parameters, both to explore the effects of different process regimes (conduction, transition, keyhole) on the porosity and microstructure of AM IN718 and to serve as a database of AM process conditions and their resultant defects. The internal porosity in the full gage regions of all fatigue specimens was characterized prior to HCF testing using X-ray computed tomography. Following fatigue testing, SEM fractography was used to identify the locations of fatigue critical flaws that led to failure. Using the data acquired in this work, the relationships between fatigue performance of IN718 at high temperature and the process conditions and associated porosity will be interpreted. These relationships could be adapted and used in a quality assurance model for L-PBF AM IN718.
AB - Using laser powder bed fusion additive manufacturing (L-PBF AM), a series of 10 sample walls were made, sectioned into fatigue specimens, and tested using high cycle fatigue (HCF) testing with a stress ratio of 0.1 at 538 °C. Each wall was built with a different process pedigree, or set of process parameters, both to explore the effects of different process regimes (conduction, transition, keyhole) on the porosity and microstructure of AM IN718 and to serve as a database of AM process conditions and their resultant defects. The internal porosity in the full gage regions of all fatigue specimens was characterized prior to HCF testing using X-ray computed tomography. Following fatigue testing, SEM fractography was used to identify the locations of fatigue critical flaws that led to failure. Using the data acquired in this work, the relationships between fatigue performance of IN718 at high temperature and the process conditions and associated porosity will be interpreted. These relationships could be adapted and used in a quality assurance model for L-PBF AM IN718.
KW - Additive manufacturing
KW - Alloy 718
KW - High-cycle fatigue
KW - XCT
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U2 - 10.1007/978-3-031-27447-3_36
DO - 10.1007/978-3-031-27447-3_36
M3 - Conference contribution
AN - SCOPUS:85161405539
SN - 9783031274466
T3 - Minerals, Metals and Materials Series
SP - 571
EP - 591
BT - Proceedings of the 10th International Symposium on Superalloy 718 and Derivatives, 2023
A2 - Ott, Eric A.
A2 - Andersson, Joel
A2 - Sudbrack, Chantal
A2 - Bi, Zhongnan
A2 - Bockenstedt, Kevin
A2 - Dempster, Ian
A2 - Fahrmann, Michael
A2 - Jablonski, Paul
A2 - Kirka, Michael
A2 - Liu, Xingbo
A2 - Nagahama, Daisuke
A2 - Smith, Tim
A2 - Stockinger, Martin
A2 - Wessman, Andrew
T2 - 10th International Symposium on Superalloy 718 and Derivatives, 2023
Y2 - 19 March 2023 through 23 March 2023
ER -