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Electron Backscatter Diffraction Investigation of Heat Deformation Behavior of 2205 Duplex Stainless Steel
Author(s) -
Song Yaohui,
Li Yugui,
Zhao Guanghui,
Liu Haitao,
Li Huaying,
Li Juan,
Liu Erqiang
Publication year - 2021
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.202000587
Subject(s) - materials science , electron backscatter diffraction , austenite , metallurgy , dynamic recrystallization , recrystallization (geology) , ferrite (magnet) , strain partitioning , grain boundary , composite material , microstructure , hot working , geology , paleontology , tectonics
Herein, the thermal compression of 2205 duplex stainless steel is simulated using a thermal simulation testing machine at 850–1100 °/0.01 s −1 and 850–1100 °/10 s −1 , and the large deformation zone (LDZ) and free deformation zone (FDZ) of the structure are characterized by electron backscatter diffraction (EBSD). The study results show that the stress–strain curve with a strain rate of 10 s −1 hardens continuously. In addition, ferrite undergoes deformation mostly when the strain is less than 0.33, and strain hardening occurs in austenite after the strain reaches 0.33. As a result, the curve ascends and steepens, and secondary hardening occurs. Continuous dynamic recrystallization (CDRX) is distinctly observed in original ferrite grains, whereas the austenite grains are recrystallized discontinuously due to the bulging high‐angle grain boundaries (HAGBs). Meanwhile, the recrystallization fraction in the large deformation region of both ferrite and austenite is significantly higher than that in the free deformation zone. The orientation distribution function (ODF) diagram analysis reveals that ferrite is mainly composed of the rotation cube {001}<111> texture, and austenite mainly consists of the rolled α‐fiber texture, including brass {011}<211>, Gauss {011}<100>, and {011}<111>.