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

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Technical Report,02 Dec 2018,01 May 2019

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CCDC Army Research Laboratory Aberdeen Proving Ground United States

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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.

Subject Categories:

  • Metallurgy and Metallography
  • Printing and Graphic Arts

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