MICROSTRUCTURE EVOLUTION OF LEAN DUPLEX STAINLESS STEEL 2101 DURING HOT DEFORMATION

doi:10.3724/SP.J.1037.2009.00856

Acta Metall Sin

2010, Vol. 46

Issue (6): 641-646 DOI: 10.3724/SP.J.1037.2009.00856

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MICROSTRUCTURE EVOLUTION OF LEAN DUPLEX STAINLESS STEEL 2101 DURING HOT DEFORMATION

FANG Yiliu¹; LIU Zhenyu¹; ZHANG Weina¹; WANG Guodong¹; SONG Hongmei²; JIANG Laizhu²

1.State Key Laboratory of Rolling and Automation; Northeastern University; Shenyang 110819
2.Research Institute for Stainless Steels; R&D Center; Baosteel Co.; Shanghai 201900

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FANG Yiliu LIU Zhenyu ZHANG Weina WANG Guodong SONG Hongmei JIANG Laizhu. MICROSTRUCTURE EVOLUTION OF LEAN DUPLEX STAINLESS STEEL 2101 DURING HOT DEFORMATION. Acta Metall Sin, 2010, 46(6): 641-646.

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Abstract

Duplex stainless steels (DSSs) were processed to have a balanced microstructure containing approximately equal amounts of ferrite and austenite, which exhibit exceptional mechanical properties and corrosion resistance. Lean duplex stainless steel (LDX) 2101 with lower contents of Ni and Mo had been developed in order to further reduce the cost. The coexistence of ferrite and austenite during hot deformation led to a complicated deformation behavior. However, little research had been dedicated to studying the microstructure evolution in LDX 2101 compared with traditional DSSs. In addition, the reported results of microstructure evolution both in ferrite and austenite phases of traditional DSSs exhibited obvious controversy. In the present paper, the microstructure evolution of the LDX 2101 during hot compression at a strain rate of 5 s⁻¹ and 1000 ℃ was studied by electron backscatter diffraction (EBSD) together with TEM. The results showed that continuous dynamic recrystallization (CDRX) occurred both in ferrite and austenite phases by gradual transformation of ow angle grain boundary into high angle rain boundary. In addition, a large number of Σ3 twins appeared after solution anneaing treatment. The hot deformation resulted in a progressive disappearance of the Σ3 twin boundaries in austenite phase. Flow curve characteristics of the LDX 211 during hot deformation were interpreted by the coupling behaviors of the microstructure evolution of its both phases.

Key words: lean duplex stainless steel 2101 hot deformation continuous dynamic recrystallization (CDRX) twin

Received: 23 December 2009

Fund:

Supported by National Natural Science Foundation of China (No.50734002) and Naional Basic Research Program of China (No.2004CB619108)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2009.00856 OR https://www.ams.org.cn/EN/Y2010/V46/I6/641

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