Formation of acicular ferrite at oxide particles in steels
作者:
BarbaroF. J.,
KrauklisP.,
EasterlingK. E.,
期刊:
Materials Science and Technology
(Taylor Available online 1989)
卷期:
Volume 5,
issue 11
页码: 1057-1068
ISSN:0267-0836
年代: 1989
DOI:10.1179/mst.1989.5.11.1057
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractExperimental steels similar in composition to structural grades were prepared from weld metal deposits to study the formation of acicular ferrite under conditions experienced in the heat affected zone for a range of welding processes. The formation of acicular ferrite under these conditions is found to be dependent on the presence of a suitable distribution of oxide inclusions>0·4μm in size. The characteristics and proportion of acicular ferrite in the microstructure also depend on the prior austenite grain size and cooling rate. The relationship between these factors is presented in a simplified quantitative model, which is supported by data from limited welding trials. Metallographic observations suggest that acicular ferrite forms in two stages. The first involves the formation of relatively large primary acicular ferrite plates by multiple nucleation at intragranular inclusion sites, and the second involves the formation of many smaller acicular ferrite grains that grow sympathetically from the primary plates.MST/1027
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