Feasibility of Cryomilled 17-4 Stainless Steel Powder as Feedstock for Additive Manufacturing
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 28, 2020
- Accession Number
- AD1100837
Entities
People
- Andelle Kudzal
- Brandon McWilliams
- Clara Mock
- Frank Kellogg
- Josh Taggart-scarff
- Ryan Rogers
Organizations
- United States Army Research Laboratory