Study on as-cast microstructure of Fe-15Mn-10Al-5Ni-0.8C low density duplex steel

The microstructure of Fe-15Mn-10Al-5Ni-0.8C low density duplex steel ingots was studied by laser confocal scanning calorimetry , metallographic microscopy and scanning electron microscopy. The results indicated that: the microstructure of Fe-15Mn-10Al-5Ni-0.8C low density steel was mainly composed o...

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Veröffentlicht in:	Materials research express 2022-02, Vol.9 (2), p.26512
Hauptverfasser:	Guo, Zhihe, Hu, Fengya, Wang, Zhongjun, Fu, Kuijun, Li, Weijuan, Wang, Jiaji
Format:	Artikel
Sprache:	eng
Schlagworte:	as-cast organization Austenite Critical temperature Delta ferrite Dendritic structure Dynamic models Fe-Mn-Al-C low density steels ferrite Grain growth Ingot casting Low density materials Microscopy Microstructure Solution heat treatment δ- ferrite
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Zusammenfassung:	The microstructure of Fe-15Mn-10Al-5Ni-0.8C low density duplex steel ingots was studied by laser confocal scanning calorimetry , metallographic microscopy and scanning electron microscopy. The results indicated that: the microstructure of Fe-15Mn-10Al-5Ni-0.8C low density steel was mainly composed of coarse austenite dendrites and δ -ferrite phase in dendrite. The δ -ferrite could be completely eliminated by solution treatment. A dynamic model of austenite grain growth was established. Through analysis, it was concluded that the critical temperature for rapid austenite growth was 1250 °C. The activation energy for austenite grain growth was 365 KJ/mol as calculated by Sellars’ model.
ISSN:	2053-1591 2053-1591
DOI:	10.1088/2053-1591/ac4ebc