Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Austenite Stability of Sintered Fe-based Alloy

철계 소결합금의 오스테나이트 안정성

  • Choi, Seunggyu (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University) ;
  • Seo, Namhyuk (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University) ;
  • Jun, Junhyub (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University) ;
  • Son, Seung Bae (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University) ;
  • Lee, Seok-Jae (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University)
  • 최승규 (전북대학교 신소재공학부) ;
  • 서남혁 (전북대학교 신소재공학부) ;
  • 전준협 (전북대학교 신소재공학부) ;
  • 손승배 (전북대학교 신소재공학부) ;
  • 이석재 (전북대학교 신소재공학부)
  • Received : 2020.10.10
  • Accepted : 2020.10.22
  • Published : 2020.10.28
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Abstract

In the present study, we investigated the austenite stability of a sintered Fe-based nanocrystalline alloy. The volume fraction of austenite was measured based on the X-ray diffraction data of sintered Fe-based nanocrystalline alloys, which were prepared by high-energy ball milling and spark plasma sintering. The sintered alloy samples showed a higher volume fraction of austenite at room temperature as compared to the equilibrium volume fraction of austenite obtained using thermodynamic calculations, which resulted from the nanosized crystalline structure of the sintered alloy. It was proved that the austenite stability of the sintered Fe-based alloy increased with a rise in the amount of austenite stabilizing elements such as Mn, Ni, and C; however, it increased more effectively with a decrease in the actual grain size. Furthermore, we proposed a new equation to predict the martensite starting temperature for sintered Fe-based alloys.

Keywords

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