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Metals 2016, 6(9), 223; doi:10.3390/met6090223

Deformation Characteristic and Constitutive Modeling of 2707 Hyper Duplex Stainless Steel under Hot Compression

1
School of Metallurgy, Northeastern University, Shenyang 110819, China
2
Technology Center of Taiyuan Iron and Steel Croup Co. Ltd., Taiyuan 030001, China
3
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Soran Birosca
Received: 18 August 2016 / Revised: 2 September 2016 / Accepted: 5 September 2016 / Published: 12 September 2016
(This article belongs to the Special Issue Process-Structure-Property Relationships in Metals)
View Full-Text   |   Download PDF [13777 KB, uploaded 12 September 2016]   |  

Abstract

Hot deformation behavior and microstructure evolution of 2707 hyper duplex stainless steel (HDSS) were investigated through hot compression tests in the temperature range of 900–1250 °C and strain rate range of 0.01–10 s−1. The results showed that the flow behavior strongly depended on strain rate and temperature, and flow stress increased with increasing strain rate and decreasing temperature. At lower temperatures, many precipitates appeared in ferrite and distributed along the deformation direction, which could restrain processing of discontinuous dynamic recrystallization (DRX) because of pinning grain boundaries. When the temperature increased to 1150 °C, the leading softening behaviors were dynamic recovery (DRV) in ferrite and discontinuous DRX in austenite. When the temperature reached 1250 °C, softening behavior was mainly DRV in ferrite. The increase of strain rate was conducive to the occurrence of discontinuous DRX in austenite. A constitutive equation at peak strain was established and the results indicated that 2707 HDSS had a higher Q value (569.279 kJ·mol−1) than other traditional duplex stainless steels due to higher content of Cr, Mo, Ni, and N. Constitutive modeling considering strain was developed to model the hot deformation behavior of 2707 HDSS more accurately, and the correlation coefficient and average absolute relative error were 0.992 and 5.22%, respectively. View Full-Text
Keywords: 2707 hyper duplex stainless steel; hot deformation behavior; hot compression; microstructure; constitutive modeling 2707 hyper duplex stainless steel; hot deformation behavior; hot compression; microstructure; constitutive modeling
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MDPI and ACS Style

Li, H.; Jiao, W.; Feng, H.; Li, X.; Jiang, Z.; Li, G.; Wang, L.; Fan, G.; Han, P. Deformation Characteristic and Constitutive Modeling of 2707 Hyper Duplex Stainless Steel under Hot Compression. Metals 2016, 6, 223.

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