Archives of Metallurgy and Materials

Institute of Metallurgy and Materials Science of Polish Academy of Sciences
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EFFECT OF COMPOSITION ON STRAIN-INDUCED MARTENSITE TRANSFORMATION OF FeMnNiC ALLOYS FABRICATED BY POWDER METALLURGY

  • SEUNGGYU CHOI (JEONBUK NATIONAL UNIVERSITY, DIVISION OF ADVANCED MATERIALS ENGINEERING) ;
  • JUNHYUB JEON (JEONBUK NATIONAL UNIVERSITY, DIVISION OF ADVANCED MATERIALS ENGINEERING) ;
  • NAMHYUK SEO (JEONBUK NATIONAL UNIVERSITY, DIVISION OF ADVANCED MATERIALS ENGINEERING) ;
  • YOUNG HOON MOON (PUSAN NATIONAL UNIVERSITY, SCHOOL OF MECHANICAL ENGINEERING) ;
  • IN-JIN SHON (JEONBUK NATIONAL UNIVERSITY, DIVISION OF ADVANCED MATERIALS ENGINEERING) ;
  • SEOK-JAE LEE (JEONBUK NATIONAL UNIVERSITY, DIVISION OF ADVANCED MATERIALS ENGINEERING)
  • Published : 20200000
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Abstract

We investigated the austenite stability and mechanical properties in FeMnNiC alloy fabricated by spark plasma sintering. The addition of Mn, Ni, and C, which are known austenite stabilizing elements, increases its stability to a stable phase existing above 910℃ in pure iron; as a result, austenitic microstructure can be observed at room temperature, depending on the amounts of Mn, Ni, and C added. Depending on austenite stability and the volume fraction of austenite at a given temperature, strain-induced martensite transformation during plastic deformation may occur. Both stability and the volume fraction of austenite can be controlled by several factors, including chemical composition, grain size, dislocation density, and so on. The present study investigated the effect of carbon addition on austenite stability in FeMnNi alloys containing different Mn and Ni contents. Microstructural features and mechanical properties were analyzed with regard to austenite stability.

Keywords

Acknowledgement

This research was supported by the Basic Science Research program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (2016R1A1B03935163). It also received financial support from the Ministry of Trade, Industry and Energy (MOTIE) and Korea Institute for Advancement of Technology (KIAT), through the International Cooperative R&D program (P006837).