Title

Recrystallization of Duplex Stainless Steels

Authorship

REICK, W.; POHL, M.; PADILHA, A. F.

REICK, W.

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POHL, M.

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PADILHA, A. F.

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DOI

10.5151/2594-5327-49v8-327-336

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Abstract

In comparison to single-phase microstructures, ferritic-austenitic duplex stainless steels exhibit different work hardening and recrystallization behavior. This paper presents a comparative study on recrystallization heat treatment of a cold-rolled duplex grade (W.-Nr: 1.4462), an ordinary austenitic stainless steel (W.-Nr: 1.4404), and a high-alloy ferritic grade (W.-Nr: 1.4575). The investigations include X-ray diffraction (phase analysis, dislocation density measurement, Debye-Scherrer analysis), macro- and microhardness testing, and transmission electron microscopy. The results show the occurrence of the following phenomena: extensive recovery and recrystallization in the ferrite; limited recovery and extensive recrystallization in the austenite; and eutectoid transformation of ferrite into sigma phase and austenite. The eutectoid transformation influences the recrystallization kinetics of both phases.

Keywords

duplex stainless steels, recrystallization, recovery, sigma phase, cold rolling, dislocation density