[Ncame-students] Fwd: Build Failures in Additive ?

Nima Shamsaei shamsaei at auburn.edu
Wed Oct 14 06:45:16 CDT 2020

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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