Transformation characteristics of ductile iron austempered from intercritical austenitizing temperature ranges
Küçük Resim Yok
Tarih
2009
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Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In the present work, the transformation characteristics of ductile iron austempered from intercritical austenitization temperature ranges were investigated. For this purpose, an unalloyed ductile cast iron containing 3.50 wt% C, 2.63 wt% Si and 0.318 wt% Mn were intercritically austenitized (partially austenitized) at various temperatures and then rapidly transformed to a salt bath held at the 365 °C for austempering for various times to produce dual matrix structure with different ausferrite volume fractions in ferrite matrix. A microstructure map was created to illustrate the transformation of products quantitatively as a function of austempering time for a particular intercritical and austempering heat treatment temperature and time. It was demonstrated that the total volume fraction of transformed phases was approximately constant for all austempering times after rapidly transforming samples from a particular intercritical temperature to austempering temperature. It was found out that the new ferrite (It is also called epitaxial ferrite) introduced into the intercritically austenitized structure during austempering and its content was dependent on the intercritical austenitizing temperature and austempering time. © 2006 Springer Science+Business Media, LLC.
Açıklama
Anahtar Kelimeler
Austenitic transformations, Ductility, Ferrite, Fourier transforms, Manganese, Manganese compounds, Semiconducting silicon compounds, Titration, Ausferrite, Austempering, Austempering temperatures, Austenitization, Austenitizing temperatures, Ductile cast irons, Ductile irons, Ferrite matrixes, Heat treatment temperatures, Matrix structures, New ferrites, Salt baths, Temperature ranges, Cast iron
Kaynak
Journal of Materials Science
WoS Q Değeri
Scopus Q Değeri
Q1
Cilt
44
Sayı
5
