“…6) Figure 13 indicates that the deformation at low temperature and high strain rate does not result in changes of microstructure and texture. Calvillo et al have reported the same trend on Fe2 mass%Si; 19) they carried out plane strain compression at 1173 K with a strain rate of 3.6 s ¹1 and reported that the texture consisted of ¡ and £ fiber with elongated grain structure in the mid-thickness layer.…”
Section: Deformation Conditions For the Occurrence Of Thementioning
The relationship between the mechanism of high temperature deformation and the evolution behavior of microstructure and the texture during deformation, which has been found in various solid solution alloys, is clarified. It is shown that the preferential dynamic grain growth (PDGG) mechanism proposed by the authors can explain the behavior of microstructure change as well as texture change of all studied alloys without contradiction. The essential aspect of the PDGG mechanism is the preferential growth of crystal grains with the orientation stable for deformation and with low Taylor factor in the given deformation mode. It is concluded that the Taylor factor corresponds to dislocation density and stored energy during the high temperature deformation of solid solution alloys when viscous glide of dislocations is the rate controlling process. The possibility of the occurrence of the PDGG mechanism in materials other than solid solution alloys is also discussed.
“…6) Figure 13 indicates that the deformation at low temperature and high strain rate does not result in changes of microstructure and texture. Calvillo et al have reported the same trend on Fe2 mass%Si; 19) they carried out plane strain compression at 1173 K with a strain rate of 3.6 s ¹1 and reported that the texture consisted of ¡ and £ fiber with elongated grain structure in the mid-thickness layer.…”
Section: Deformation Conditions For the Occurrence Of Thementioning
The relationship between the mechanism of high temperature deformation and the evolution behavior of microstructure and the texture during deformation, which has been found in various solid solution alloys, is clarified. It is shown that the preferential dynamic grain growth (PDGG) mechanism proposed by the authors can explain the behavior of microstructure change as well as texture change of all studied alloys without contradiction. The essential aspect of the PDGG mechanism is the preferential growth of crystal grains with the orientation stable for deformation and with low Taylor factor in the given deformation mode. It is concluded that the Taylor factor corresponds to dislocation density and stored energy during the high temperature deformation of solid solution alloys when viscous glide of dislocations is the rate controlling process. The possibility of the occurrence of the PDGG mechanism in materials other than solid solution alloys is also discussed.
“…When the hot rolling reduction was 20%, several grains 30-50 µm in size were observed at the surface layer (Figure 2b). Although dynamic recovery and dynamic recrystallization are important physical phenomena that occur during deformation at high temperature, dynamic recrystallization is difficult in BCC-structured electrical steel due to its high stacking fault energy [29][30][31]. Considering the low strain rate and rapid temperature drop during the hot rolling in this study, these small grains may originate from the inheritance of the as-cast microstructure.…”
Section: Microstructure and Texture Of As-cast And Hot-rolled Stripmentioning
In this study, the effect of the hot-cold rolling process on the evolution of the microstructure, texture and magnetic properties of strip-cast non-oriented electrical steel was investigated by introducing hot rolling with different reductions. The results indicate that hot rolling with an appropriate reduction, such as the 20% used in this study, increases the shear bands and {100} deformed microstructure in the cold roll sheet. As a result, in our study, enhanced η and Cube recrystallization texture and the improved magnetic induction were obtained. However, hot rolling with excessive reduction (36–52%) decreased the shear bands and increased the α-oriented deformation microstructure with low stored energy. It enhanced the α recrystallization texture and weakened the η texture, resulting in a decrease in the magnetic induction. In addition, hot rolling promoted the precipitation of supersaturated solid solution elements in the as-cast strip, thereby affecting the subsequent microstructure evolution and the optimization of its magnetic properties.
Grain-oriented electrical steels (GOES) are silicon steels and are used in power distribution networks as transformer cores. The main magnetic properties required are high permeability and low core loss. Hysteresis losses and eddy current loses are both part of the core loss. Eddy currents are reduced by stacking strips of thin, electrically isolated material and increasing the resistance by adding silicon and aluminium. They are cold rolled to around 0.3-mm thick. Hysteresis loss arises from the formation of domains and grains not oriented in the rolling direction; hence the grains must be oriented in the k100l direction. These grains are also known to be goss texture grains. This article will cover the basics of the properties required for GOES and how the chemistry and process affect these properties.
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