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Toward Unraveling the High Temperature Microstructure Processing Properties Relationship in a Ni‐Free High Nitrogen Bearing Duplex Stainless Steel
Author(s) -
KhatamiHamedani Hossein,
ZareiHanzaki Abbas,
Ghambari Mohammad,
Mohamadizadeh Alireza,
Jafari Rahim,
Moallemi Mohammad
Publication year - 2018
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201700532
Subject(s) - materials science , dynamic recrystallization , duplex (building) , austenite , recrystallization (geology) , microstructure , metallurgy , ferrite (magnet) , strain rate , diffraction , bearing (navigation) , flow stress , composite material , hot working , optics , dna , paleontology , physics , cartography , biology , genetics , geography
The present study deals with thermomechanical processing behavior of a Ni‐free high nitrogen bearing duplex stainless steel. This is performed through compressing the material over a wide range of temperature (700–1000 °C) under the strain rates of 0.001–0.1 s −1 . The microstructural observations show that continuous and discontinuous dynamic recrystallization are taken place simultaneously in austenite at 900 and 1000 °C by generating subgrains and bulging along the prior austenite grain boundaries, respectively. Electron backscattered diffraction analysis also reveals that the occurrence of continuous dynamic recrystallization is the governing restoration phenomenon in ferrite over the studied conditions. At last, to consolidate the experimental results, a strain‐compensated constitutive model is developed to predict the flow behavior of N‐bearing duplex steel.