Transformation characteristics of ductile iron austempered from intercritical austenitizing temperature ranges

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 (partial...

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Bibliographic Details
Published in:Journal of materials science 2009-03, Vol.44 (5), p.1394-1403
Main Authors: Erdogan, Mehmet, Kilicli, Volkan, Demir, Bilge
Format: Article
Language:English
Subjects:
Austenitizing
Cast iron
Characterization and Evaluation of Materials
Classical Mechanics
Crystallography and Scattering Methods
Ferrites
Heat treating
Heat treatment
Materials Science
Nodular iron
Polymer Sciences
Salt baths
Solid Mechanics
Temperature
Transformations (mathematics)
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Summary: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.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-006-1415-7