[Ncame-students] Build Failures in Additive ?

Arash Soltani Tehrani azs0181 at auburn.edu
Wed Oct 14 08:15:37 CDT 2020

Please try to send your figures today by COB! Please specify which type of defect/material/process is that: either in the file name or in a PPT file. If it is from your published work, please send the link to your paper as well. Thank you

Very Respectfully,

Arash Soltani-Tehrani
Ph.D. Student | Auburn University
AM Laboratory Coordinator | Nat’l Cent. for Additive Mfg. Excellence (NCAME)
Senator | Graduate Student Council (GSC) | Auburn University
Phone: (334) 497-2159
Email: azs0181 at auburn.edu |
Website: eng.auburn.edu/ncame
From: Ncame-students <ncame-students-bounces at mailman.eng.auburn.edu> on behalf of Nima Shamsaei <shamsaei at auburn.edu>
Sent: Wednesday, October 14, 2020 6:45 AM
To: ncame-students at eng.auburn.edu
Cc: Seyed Ghiaasiaan; Shuai Shao; Sugrib Shaha; Dyuti Sarker
Subject: [Ncame-students] Fwd: Build Failures in Additive ?

Hello everyone,

Please see the email below and share representative pictures for each defect if you have them. If you have any of these, please send them to Arash.


Can you combine these in a ppt file by the COB on Friday?



Begin forwarded message:

From: "Gradl, Paul R. (MSFC-ER13)" <paul.r.gradl at nasa.gov>
Date: October 13, 2020 at 11:35:09 PM CDT
To: Nima Shamsaei <shamsaei at auburn.edu>, Seyed Ghiaasiaan <srg0041 at auburn.edu>
Cc: "Schneider, Judith A. (MSFC-EM30)[UAH]" <judith.schneider at uah.edu>
Subject: Build Failures in Additive ?

Nima, Reza,
As we’ve been digging into additive samples, I know we’ve seen some issues in some materials. Do you have pictures of any of the following that are part of our samples or other ones Auburn has produced in studies? This can be L-PBF or LP-DED (laser powder DED – working with ASTM on terminology).

·         Internal voids or porosity due to trapped gases

·         Surface porosity

·         Keyhole porosity (forming at end of a scan) about 50 to 100 microns

·         Lack of melt-in or incomplete fusion

·         Splatter – forms much larger defects on the order of 100s of microns

·         Ejected particles

·         Cracks


Paul R. Gradl
NASA/Marshall Space Flight Center
ER13 Combustion Devices Development
Building 4203, Room 4301
Huntsville, AL 35812
Tel:  256-544-2455
Cell: 256-656-3519
Paul.R.Gradl at nasa.gov<mailto:Paul.R.Gradl at nasa.gov>

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