Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Investigation on Microstructure and Flowability of Gas Atomized Heat-resistant KHR45A Alloy Powders for Additive Manufacturing

  • Geonwoo Baek (Division of Advanced Materials Engineering, and Center for Advanced Materials and Parts of Powders (CAMP2), Kongju National University) ;
  • Mohsen Saboktakin Rizi (Division of Advanced Materials Engineering, and Center for Advanced Materials and Parts of Powders (CAMP2), Kongju National University) ;
  • Yeeun Lee (Division of Advanced Materials Engineering, and Center for Advanced Materials and Parts of Powders (CAMP2), Kongju National University) ;
  • SungJae Jo (Division of Advanced Materials Engineering, and Center for Advanced Materials and Parts of Powders (CAMP2), Kongju National University) ;
  • Joo-Hyun Choi (Boogong Co. Ltd.) ;
  • Soon-Jik Hong (Division of Advanced Materials Engineering, and Center for Advanced Materials and Parts of Powders (CAMP2), Kongju National University)
  • Received : 2023.02.20
  • Accepted : 2023.02.23
  • Published : 2023.02.28
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Abstract

In additive manufacturing, the flowability of feedstock particles determines the quality of the parts that are affected by different parameters, including the chemistry and morphology of the powders and particle size distribution. In this study, the microstructures and flowabilities of gas-atomized heat-resistant alloys for additive manufacturing applications are investigated. A KHR45A alloy powder with a composition of Fe-30Cr-40Mn-1.8Nb (wt.%) is fabricated using gas atomization process. The microstructure and effect of powder chemistry and morphology on the flow behavior are investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and revolution powder analysis. The results reveal the formation of spherical particles composed of single-phase FCC dendritic structures after gas atomization. SEM observations show variations in the microstructures of the powder particles with different size distributions. Elemental distribution maps, line scans, and high-resolution XPS results indicate the presence of a Si-rich oxide accompanied by Fe, Cr, and Nb metal oxides in the outer layer of the powders. The flowability behavior is found to be induced by the particle size distribution, which can be attributed to the interparticle interactions and friction of particles with different sizes.

Keywords

Acknowledgement

This work was supported by the Korea Institute for Advancement of Technology (KIAT), and Ministry of Trade, Industry and Energy (P0018009). This work was supported by the Technology development Program (S3211124) funded by the Ministry of SMEs and Startups (MSS, Korea).

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