Non-metallic inclusions and acicular ferrite in low carbon steel

Authors
Oh, YJLee, SYByun, JSShim, JHCho, YW
Issue Date
2000-12
Publisher
JAPAN INST METALS & MATERIALS
Citation
MATERIALS TRANSACTIONS JIM, v.41, no.12, pp.1663 - 1669
Abstract
The formation of nan-metallic inclusions with variations in various oxygen, nitrogen and titanium contents in low carbon steels has been studied. The relationship between the nature of non-metallic inclusions and the formation of acicular ferrite has been also investigated. It is found that the non-metallic inclusions observed in this study are mainly consist of Ti2O3 and TiN together with a small amount of other complex oxides containing Mn and Si. It has been confirmed that Ti2O3 and TiN play an important role in formation of acicular ferrite as a nucleation site and an austenite grain refiner, respectively. But it is not clear yet whether TiN acts as a nucleation site or not. It is also found that the volume fraction of inclusions is more effective than the type or size distribution of the non-metallic inclusions on the formation of acicular ferrite.
Keywords
HEAT-AFFECTED ZONE; MICROSTRUCTURE; NUCLEATION; TOUGHNESS; PHASES; HEAT-AFFECTED ZONE; MICROSTRUCTURE; NUCLEATION; TOUGHNESS; PHASES; acicular ferrite; non-metallic inclusions; intragranular nucleation; prior austenite grain size; gamma/alpha transformation
ISSN
0916-1821
URI
https://pubs.kist.re.kr/handle/201004/140904
DOI
10.2320/matertrans1989.41.1663
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KIST Article > 2000
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