High-temperature flow behaviour of grain-oriented and non-grain-oriented electrical steel

Abstract

Plane strain compression tests were performed on grain-oriented (GO) and non-grain-oriented steel specimens of identical silicon content. Though Arrhenius type constitutive equations showed excellent predictability of the experimental flow stresses, there were clear differences in the flow curves of the respective grades. More specifically, GO steel had higher flow stress and work hardening and showed clear presence of dynamically recrystallized grains. All these were attributed to the higher (0.06 versus 0.003 wt-%) carbon content and corresponding presence of austenite, at elevated temperatures, in the GO steel specimens.

Effect of Strain on Strain‐Induced Precipitation Behavior of MnS in 3% Si Steel

“…Although there are a few of waves, the curve can be divided into two stages as characterized in the previous study. [ 16 ] The first stage is the transient deformation stage, as shown in Figure 1, in which the fluctuating increase in stress with the increase in strain may be due to the competition between work hardening and dynamic recovery softening. The second stage is the steady deformation stage, as shown in Figure 1, in which true stress remains approximately unchanging with the increase in strain.…”

“…Although there are a few of waves, the curve can be divided into two stages as characterized in the previous study. [16] The first DOI: 10.1002/srin.202000224 Hot compression tests of 3% Si steel with a true strain range of 0.02-0.92 at a strain rate of 1 s À1 and a temperature of 1173 K, based on the Gleeble-1500 thermo-mechanical simulator, are conducted. The effect of strain on the straininduced precipitation behavior of MnS is investigated via cold field-emission ultrahigh resolution scanning electron microscopy (FESEM) and transmission electron microscopy (TEM).…”