Feasibility of Cryomilled 17-4 Stainless Steel Powder as Feedstock for Additive Manufacturing

reportActive / Technical Report | Accesssion Number: AD1100837 | Open PDF

Abstract:

Additive manufacturing (AM) powder feedstock supplied by the manufacturer is often gas atomized and supplied without post-atomization treatment. By including a preprocessing treatment prior to AM, internal powder porosity could be reduced and grain size decreased, which could improve the AM process and the mechanical properties of the finished part. This study examined the feasibility of using cryomilling as a post-atomization powder treatment for laser powder bed fusion (L-PBF) AM feedstock, using gas atomized 17-4 stainless steel powder. The effect of cryomilling on powder characteristics, such as morphology and powder flow, and the influence on the L-PBF process was examined. As-built samples from the cryomilled powder were characterized through X-ray microcomputed tomography and optical microscopy. The as-built samples were porous due to the morphological changes to the powder induced by the cryomilling process.

Author(s):
Kellogg, Frank ; Kudzal, Andelle ; Mock, Clara ; Taggart-scarff, Josh ; Rogers, Ryan ; Mcwilliams, Brandon
Author Organization(s):
CCDC Army Research Laboratory; SURVICE ENGINEERING CO ABERDEEN MD; BENNETT AEROSPACE LLC CARY NC
Funding Organization(s):
Publication Date:
2020 May 28
Pagination:
0

Security Markings

RECORD

Collection: TRECMS
Subject Terms
Communities of Interest:
Space
Descriptor(s):
materials science, aluminum alloys, additive manufacturing, engineering, manufacturing, materials, three dimensional, military research, aluminum, stainless steel, abstracts, particle size, particles, x rays, alloys, electron microscopy, lasers
Keyword(s):
cryomilling, l-pbf (laser powder bed fusion), powder feedstock, 17-4 ss, ss (stainless steel), AM feedstock, gas atomized 17-4 ss powder, am (additive manufacturing), optical microscopy, psd (Particle size distribution), morphology, xrd (x-ray diffraction), tga (thermogravimetric analysis), dsc (differential scanning calorimetry)
Subject Categories:
Materials; Test Equipment, Research Facilities and Reprography
Update Date:
2020 Jun 15