|About this Abstract
||Materials Science & Technology 2012
||Steel Product Metallurgy and Applications
||Work Hardening of Dual-Phase Steels and Its Relationship to Microstructure
||Hossein Seyedrezai, Keith Pilkey, Doug Boyd
|On-Site Speaker (Planned)
The attractive tensile properties of Dual-Phase (DP) steels, namely, continuous yielding, high initial work hardening rates and good combination of strength and ductility, has been related to the inherent plastic incompatibility between ferrite and martensite in the microstructure of these steels. With the goal of producing a DP microstructure with a superior combination of high strength and large uniform elongation, various thermo-mechanical processing (TMP) routes were used to systematically change size, volume fraction, morphology and spatial distribution of martensite particles. TMPs consisted of two different pre-heat treatments followed by an optional cold-rolling step and finally inter-critical annealing at different temperatures. Mechanical properties, and in particular work hardening behaviour of these microstructures, were then investigated using uniaxial tension and in-plain shear tests. Additionally, interrupted tensile tests were performed to measure the development of back-stresses as well as to study the evolution of dislocations during deformation using TEM and EBSD.
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