Journal
MATERIALS CHARACTERIZATION
Volume 174, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2021.111029
Keywords
Delta ferrite; 316H; Cooling rate; Phase transformation; Confocal scanning laser microscopy (CSLM) experiments
Categories
Funding
- National Natural Science Foundation of China [51704066, 51774083]
- Fundamental Research Funds for the Central Universities [N180704008]
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The experimental results demonstrate that the solidification mode of 316H austenitic stainless steel is ferrite-austenite type (FA mode) regardless of the cooling rate. A peritectic reaction occurs between ferrite and liquid phase during solidification. The higher cooling rate leads to a higher volume fraction of 6-ferrite.
High temperature confocal melting was conducted to study the volume fraction variation of as-cast 6-ferrite at cooling rate from 5 ?C/min to 6000 ?C/min of 316H austenitic stainless steel (316H). The results demonstrate that the solidification mode of 316H was ferrite-austenite type (FA mode) regardless of the cooling rate. The peritectic reaction occurs between ferrite and liquid phase during solidification. The higher the cooling rate is, the higher the 6-ferrite volume fraction is. The 6-ferrite fraction variation can be explained by the combination of FA solidification mode during solidification and ferrite to austenite solid-state transformation during cooling after solidification.
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