Deformation-induced center segregation in twin-roll cast high-Mg Al–Mg strips

The formation mechanism of center segregation in twin-roll cast (TRC) Al–Mg strips was studied. The center segregation was found to gradually change from channel segregation to a segregation band with increasing casting speed. Deformation induced by the roll separating force (RSF) was the main mecha...

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Published inScripta materialia Vol. 152; pp. 69 - 73
Main Authors Kim, Min-Seok, Kim, Su-Hyeon, Kim, Hyoung-Wook
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.07.2018
Subjects
Al–Mg alloy
Kernel average misorientation
Segregation
Twin-roll casting
Twin-roll casting
Segregation
Al–Mg alloy
Kernel average misorientation
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Summary:The formation mechanism of center segregation in twin-roll cast (TRC) Al–Mg strips was studied. The center segregation was found to gradually change from channel segregation to a segregation band with increasing casting speed. Deformation induced by the roll separating force (RSF) was the main mechanism of center segregation in the TRC strips. The dilatant behavior of dendrite cells under the RSF appears to be the main mechanism for the formation of segregation band. At relatively low casting speeds, a low compression rate can cause the liquid to squeeze toward the transverse and melt pool directions to form channel segregation. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2018.04.017