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Effect of Microstructure on Mechanical Properties of a Thin‐walled Cast Duplex Steel
Author(s) -
Petzold L.,
Minnich D.,
Kreschel T.,
Peisker D.
Publication year - 2010
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201000004
Subject(s) - microstructure , materials science , ferrite (magnet) , austenite , chemical composition , ductility (earth science) , casting , metallurgy , duplex (building) , carbide , composite material , phase (matter) , creep , thermodynamics , dna , physics , genetics , organic chemistry , chemistry , biology
The paper investigates the microstructure and the resulting mechanical properties of a duplex steel cast in sand dead‐moulds. The chemical composition and the cooling rate are the main parameters affecting the properties. The chemical composition influences the thermodynamics of the phase transformation, the cooling rate determines the kinetics of formation of the microstructure. The latter varies with changes in wall thickness (investigated from 2 to 7 mm) and the position of the material within the casting. Through heat treatment, the composition of the microstructural components can be changed selectively afterwards, thereby the properties are improved. The correlation between microstructure and mechanical properties is explained quantitatively. Additionally to the austenite‐ferrite ratio, the dispersion of microstructure has a large influence on the mechanical properties. Ranges of chemical composition and heat treatment parameters are identified where third phases, such as carbides and σ‐phase tend to occur. These influence the properties very sensitively even in small amounts. Finally, structural parameters are recognized that will lead to optimal combinations of properties. With an appropriate heat treatment technique, in particular the ductility properties are further increased.