Hot deformation behavior of a ferritic stainless steel stabilized with Nb during hot rolling simulation at different temperature ranges

Braga, Flávia Vieira; Escobar, Diana Pérez; Oliveira, Nilton José Lucinda de; Andrade, Margareth Spangler

doi:10.1557/jmr.2016.57

Cited by 8 publications

(1 citation statement)

References 23 publications

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“…The blue mapping inset in Figure 7 represents the grain region adjacent to the boundary with a very low dislocation density [29]. Generally, the high dislocation density results in a subgrain angle > 1 • [40][41][42][43] which can lead to the deformed grains having KAM > 1 • , whereas the recrystallized grains have KAM < 1 • . The newly formed grains during recrystallization revealed a random texture.…”

Section: Kernel Average Misorientation (Kam) Analysismentioning

confidence: 99%

Large Delta T Thermal Cycling Induced Stress Accelerates Equilibrium and Transformation in Super DSS

Chen

Yen

et al. 2020

Crystals

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Based on the predicted phase diagram of super duplex stainless steel (DSS) calculated by Thermo-Calc, the maximum peak temperature 1100 °C was selected to ensure no σ phase existence. This target temperature fell into the two-phase solid solution (SS) region. A series of different thermal cycling tests were carried out with the notations of 2SS, 2SS + 3 cycles, 2SS + 7 cycles, 2SS + 13 cycles, and 2SS + 20 cycles. It was found that the trend of two-phase volume ratio variation by thermal cycling followed the predicted thermodynamic equilibrium trend. After 2SS + 7 cycles, the ratio of two-phase δ/γ tended toward the ideal 1:1. According to the electron backscatter diffraction (EBSD) analysis, the δ phase crystal orientation changed from the most frequent directions of <001> and <111> of the as-received sample to the most frequent orientation of <113> after two SS treatments. While the γ phase grain always remained at <101> orientation. The grain boundary misorientation angles of the γ grains were relatively stable, ranging from 53° to 63°, but those of the δ grains were widely distributed actively presuming the lattice rotation. The Kernel Average Misorientation (KAM) value of the local strain in face center cubic (fcc) γ grains was varied and greater than that of the body center cubic (bcc) δ phase, indicating that the former, with a large grain boundary misorientation had larger local deformation than the latter, which possesses wide random misorientation angle distribution.

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