Abstract
Samples of duplex stainless steel 32205 (standard duplex) and 32304 (lean duplex) were investigated in the as-received state, cold rolling (with thickness reduction of 64 % and 62 % respectively) and after annealing at 1055oC for 20 s soaking. Crystallographic microtexture was obtained via Electron BackScatter Diffraction (EBSD) technique. The results showed that the crystallographic microtexture of ferrite phase in the as-received, cold rolled and annealed condition were more intense in alpha fiber= // RD and tetha fiber. The austenite microtexture was shown to be, for all conditions, mainly composed by Brass component.
Highlights
Duplex stainless steels (DSS) are characterized by a roughly equal two-part microstructure of austenite (y) and ferrite (δ)
The microstructure evolution from the as-received samples to cold rolling and annealing are presented in Figure 1 and 2 for the DSS’s S32304 and S32205, respectively
The micrographs show the typical microstructures of the DSS with the δ-ferrite phase and γ-austenite phase elongated in the rolling direction
Summary
Duplex stainless steels (DSS) are characterized by a roughly equal two-part microstructure of austenite (y) and ferrite (δ). Such process steps the steel undergoes microstructural changes, which affect the mechanical properties of the final product.[12] For example, gas transportation tube are fabricated from hot rolled and annealed sheets Their texture can be modified during deformation, recrystallization and phase transformations that occurring in each phase (δ/γ) at various stages of the thermomechanical treatment.[7,11] The texture development of cold rolled and annealed austenitic and ferritic stainless steels has been studied. The knowledge about of the microstructural changes and texture evolution which can occur during of the rolling and aneealing process is necessary for the undestanding of its influence on the final mechanical properties.[11,12,21] Data provided by the analysis of crystallographic texture are used as an input in a simple micromechanical model for the correct choice of heat treatment that was proposed by Badji et al.[2] for decrease the degree of heterogeneity to obtain good final mechanical properties
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