SAE Update - January 2022 - 33

TECH FOCUS:
MATERIALS
Laser-melting a thin layer of metal powder in a TRUMPF powder-bed system.
an additional 35 under development. The bulk of the
documents cover the key commodities used in
aerospace, namely: titanium, superalloy, aluminum,
and high-strength steel. The committee has also
developed M&P specifications for polymers used in
the aircraft cabin.
There are a number of AM technologies being
investigated; however, the most popular " modalities "
for metals are powder bed fusion (PBF) and directed
energy deposition (DED). (Each has various
appellations [e.g. DMLS, LMF], but these are the most
common labels in the US.)
For polymer systems, it is fuse filament fabrications
(FFF) that is most common. The process involves
extruding material from a heated nozzle. With a
modest technology readiness level (TRL), there are
numerous innovations for both machines and
precursor materials that continue to advance the
industry.
The general areas of improvement for machines
involve larger build chambers, multi power sources
(e.g. quad lasers), and internal powder reuse systems.
UPDATE
More sophisticated systems
include melt-pool monitoring
and adaptive control systems,
using machine learning.
Nevertheless, most of the effort
in aerospace standards is
directed towards perfecting the
fundamental printing process -
recall, the tolerance for failure of
critical parts is one in a billion for
a Part 25 air transport aircraft.
In terms of materials
development, AMS AM has
released 17 documents, 16 of
which address metal powder
(versus only one for wire). Why
such disproportionate rigor?
Powder characterization is
particularly nuanced in terms of
morphology (e.g. size, shape,
distribution) and bulk chemistry.
Moreover, other factors need to
January 2022
33
TRUMPF

SAE Update - January 2022

Table of Contents for the Digital Edition of SAE Update - January 2022

SAE Update - January 2022 - Cov1
SAE Update - January 2022 - Cov2
SAE Update - January 2022 - 1
SAE Update - January 2022 - 2
SAE Update - January 2022 - 3
SAE Update - January 2022 - 4
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SAE Update - January 2022 - 7
SAE Update - January 2022 - 8
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SAE Update - January 2022 - 12
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SAE Update - January 2022 - 45
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