Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Development of Fe-Mn-based Hybrid Materials Containing Nano-scale Oxides by a Powder Metallurgical Route

분말야금법을 활용한 나노 하이브리드 구조 철-망간계 분말야금재 제조

  • Jeon, Jonggyu (School of Materials Science and Engineering, Kookmin University) ;
  • Kim, Jungjoon (School of Materials Science and Engineering, Kookmin University) ;
  • Choi, Hyunjoo (School of Materials Science and Engineering, Kookmin University)
  • 전종규 (국민대학교 신소재공학부) ;
  • 김정준 (국민대학교 신소재공학부) ;
  • 최현주 (국민대학교 신소재공학부)
  • Received : 2020.06.10
  • Accepted : 2020.06.24
  • Published : 2020.06.28
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Abstract

The automotive industry has focused on the development of metallic materials with high specific strength, which can meet both fuel economy and safety goals. Here, a new class of ultrafine-grained high-Mn steels containing nano-scale oxides is developed using powder metallurgy. First, high-energy mechanical milling is performed to dissolve alloying elements in Fe and reduce the grain size to the nanometer regime. Second, the ball-milled powder is consolidated using spark plasma sintering. During spark plasma sintering, nanoscale manganese oxides are generated in Fe-15Mn steels, while other nanoscale oxides (e.g., aluminum, silicon, titanium) are produced in Fe-15Mn-3Al-3Si and Fe-15Mn-3Ti steels. Finally, the phases and resulting hardness of a variety of high-Mn steels are compared. As a result, the sintered pallets exhibit superior hardness when elements with higher oxygen affinity are added; these elements attract oxygen from Mn and form nanoscale oxides that can greatly improve the strength of high-Mn steels.

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