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<div>All </div>
<div dir="ltr">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</div>
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<div style="direction: ltr">Very Respectfully,</div>
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<div style="direction: ltr">Arash Soltani-Tehrani</div>
<div style="direction: ltr">Ph.D. Student | Auburn University</div>
<div style="direction: ltr">AM Laboratory Coordinator | Nat’l Cent. for Additive Mfg. Excellence (NCAME)
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<div style="direction: ltr">Senator | Graduate Student Council (GSC) | Auburn University</div>
<div style="direction: ltr">Phone: (334) 497-2159</div>
<div style="direction: ltr">Email: azs0181@auburn.edu |</div>
<div style="direction: ltr">Website: eng.auburn.edu/ncame</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"><b>From:</b> Ncame-students <ncame-students-bounces@mailman.eng.auburn.edu> on behalf of Nima Shamsaei <shamsaei@auburn.edu><br>
<b>Sent:</b> Wednesday, October 14, 2020 6:45 AM<br>
<b>To:</b> ncame-students@eng.auburn.edu<br>
<b>Cc:</b> Seyed Ghiaasiaan; Shuai Shao; Sugrib Shaha; Dyuti Sarker<br>
<b>Subject:</b> [Ncame-students] Fwd: Build Failures in Additive ?
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<div dir="ltr">Hello everyone,</div>
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<div dir="ltr">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.</div>
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<div dir="ltr">Arash,</div>
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<div dir="ltr">Can you combine these in a ppt file by the COB on Friday?</div>
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<div dir="ltr">Thanks,</div>
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<div dir="ltr">NS<br>
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Begin forwarded message:<br>
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<div dir="ltr"><b>From:</b> "Gradl, Paul R. (MSFC-ER13)" <paul.r.gradl@nasa.gov><br>
<b>Date:</b> October 13, 2020 at 11:35:09 PM CDT<br>
<b>To:</b> Nima Shamsaei <shamsaei@auburn.edu>, Seyed Ghiaasiaan <srg0041@auburn.edu><br>
<b>Cc:</b> "Schneider, Judith A. (MSFC-EM30)[UAH]" <judith.schneider@uah.edu><br>
<b>Subject:</b> <b>Build Failures in Additive ?</b><br>
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<p class="MsoNormal">Nima, Reza,</p>
<p class="MsoNormal">As we’ve been digging into additive samples, I know we’ve seen some issues in some materials.<b> Do you have pictures of any of the following that are part of our samples or other ones Auburn has produced in studies?
</b>This can be L-PBF or LP-DED (laser powder DED – working with ASTM on terminology).</p>
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<p class="MsoListParagraph" style="text-indent:-.25in; mso-list:l0 level1 lfo1"><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">        
</span></span></span>Internal voids or porosity due to trapped gases</p>
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</span></span></span>Surface porosity</p>
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</span></span></span>Keyhole porosity (forming at end of a scan) about 50 to 100 microns</p>
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</span></span></span>Lack of melt-in or incomplete fusion</p>
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</span></span></span>Splatter – forms much larger defects on the order of 100s of microns</p>
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</span></span></span>Ejected particles</p>
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</span></span></span>Cracks</p>
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<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal">Paul</p>
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<p class="MsoNormal"><span style="font-size:10.0pt; color:black">Paul R. Gradl<br>
</span><b><span style="font-size:10.0pt">NASA<span style="color:black">/Marshall Space Flight Center</span></span></b><span style="font-size:10.0pt; color:black"><br>
ER13 Combustion Devices Development<br>
Building 4203, Room 4301</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; color:black">Huntsville, AL 35812<br>
Tel:  256-544-2455<br>
Cell: 256-656-3519<br>
<a href="mailto:Paul.R.Gradl@nasa.gov" target="_blank"><span style="color:blue">Paul.R.Gradl@nasa.gov</span></a></span></p>
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