Title

Processing of a Duplex Stainless Steel by Equal Channel Angular Extrusion

Processing of a Duplex Stainless Steel by Equal Channel Angular Extrusion

Authorship

Farias, Fernanda Aparecida; Pontes, Marcos Javert Hilgemberg; Cintho, Osvaldo Mitsuyuki

Farias, Fernanda Aparecida

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Pontes, Marcos Javert Hilgemberg

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Cintho, Osvaldo Mitsuyuki

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DOI

10.5151/2594-5327-33299

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Abstract

A UNS S32205 duplex stainless steel was processed by ECAE in three different velocities, at room temperature, and heat treated in different temperatures and times to evaluate recrystallization. Attrition forces promoted great deformation heterogeneity in the samples sections, with hardness increase, and morphology changes in the grains and changing orientation through the processed samples. In treated samples surface, two types of distinct structures was formed, with surfaces positioned in 90o and 120o angles, probably because the annihilation of pilled dislocations in ferrite based centered cubic structure and austenite face centered cubic structure, respectively. The induced martensite by cold deformation was also observed. Some samples demonstrate located points of recrystallization in grain boundaries for some treatment conditions, the number of recrystallization nuclei increased with the increase of treatment time.

A UNS S32205 duplex stainless steel was processed by ECAE in three different velocities, at room temperature, and heat treated in different temperatures and times to evaluate recrystallization. Attrition forces promoted great deformation heterogeneity in the samples sections, with hardness increase, and morphology changes in the grains and changing orientation through the processed samples. In treated samples surface, two types of distinct structures was formed, with surfaces positioned in 90o and 120o angles, probably because the annihilation of pilled dislocations in ferrite based centered cubic structure and austenite face centered cubic structure, respectively. The induced martensite by cold deformation was also observed. Some samples demonstrate located points of recrystallization in grain boundaries for some treatment conditions, the number of recrystallization nuclei increased with the increase of treatment time.

Keywords

Duplex, ECAP, stainless steel.

Duplex, ECAP, stainless steel.