1,720,969 research outputs found
Effects of pre-deformation on edge cracks of non-oriented electrical steels during cold rolling
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Final Thickness Reduction, Bulk Contents of Sulfur and Aluminum, Development of Cube + Goss Texture and Magnetic Properties in Fe-3.1wt.%Si-0.1wt.%Mn Steels
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Effect of Al Contents on Magnetic Domain Structures of {100} Grains in Electrical Steels
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Final Thickness Reduction and Development of Goss texture in C- and Al-free Fe-3%Si-0.1%Mn-0.012%S Electrical Steel
No full textThe correlation between final thickness reduction and development of Goss texture has been investigated in a C- and Al-free Fe-3%Si electrical steel. During final annealing, the annealing texture is transited from {110}aSND to {100}aSND texture with increasing final thickness reduction. This is due to the decrease in primary grain size after pre-annealing with increasing final thickness reduction which accelerates the selective growth rate of the {100} grains at the expense of the other {hkl} grains. At an optimal final thickness reduction of 75.8%, the high magnetic induction of 1.95 Tesla, which arises from the sharp {110} Goss texture and is comparable to that of conventional grain-oriented electrical steels, is obtained from the C- and Al-free Fe-3%Si-0.1%Mn electrical steel. Such a high magnetic property is produced through the surface-energy-induced selective grain growth of the Goss grains under the lower surface-segregated condition of sulfur which makes the surface energy of the {110} plane lowest among the {hkl} planes.111sciescopuskc
Influences of Carbon and Silicon on Blister Formation in Scale Surface During High Temperature Oxidation of Carbon Steels
No full textThe in-situ blistering phenomena of the scale ‘surface’ was investigated on three carbon steels with respect to carbonand silicon concentrations, such as 0.05 wt%C, 0.2 wt%C, and 0.2 wt%C-0.2 wt%Si. The oxidation and blisteringkinetics and blister area fraction during high temperature oxidation were analyzed. The average thickness ofthe surface scale by oxidation during isothermal holding from 800 to 1200°C in dry air was observed to decreasewhen the amount of carbon increased and/or when Si was inserted additionally. Thus, the blistering behaviordepended primarily on a change in oxidation temperature (Tox) as well as amounts of carbon and silicon in thematrix. It is also revealed that such blister formation would be triggered by growth of internal stress and active generationsof CO and/or CO2 gases at the interface between the scale and matrix since carbon would result in anincrease in the blister formation by generating CO and/or CO2 gas. In addition, silicon might play an important rolein preventing the blister formation at Tox below 900°C by reducing the thickness of the surface scale whilst siliconmight enhance the blister formation by means of the appreciable micro-void formation in the scale layer at Toxhigher 900 °C.110Nsciescopuskc
The behaviour of stacking fault energy upon interstitial alloying
Full text linkStacking fault energy is one of key parameters for understanding the mechanical properties of face-centered cubic materials. It is well known that the plastic deformation mechanism is closely related to the size of stacking fault energy. Although alloying is a conventional method to modify the physical parameter, the underlying microscopic mechanisms are not yet clearly established. Here, we propose a simple model for determining the effect of interstitial alloying on the stacking fault energy. We derive a volumetric behaviour of stacking fault energy from the harmonic approximation to the energy-lattice curve and relate it to the contents of interstitials. The stacking fault energy is found to change linearly with the interstitial content in the usual low concentration domain. This is in good agreement with previously reported experimental and theoretical data.111Ysciescopu
Mechanism for selective growth in electrical steel
No full textThrough the competitive selective growth process between {100}, {110}, and {111} grains during final annealing which is governed by the primary grain size and the surface segregation concentration of sulfur, the sharp {110} annealing texture can be developed in a C-and Al-free Fe-3%Si-0.1%Mn electrical steel. Generally, the selective growth of the {110} grains occurs actively under the low surface segregation concentration of sulfur. In spite of the surface energy disadvantage, the selective growth of a {hkl} grain can however occur, if the {hkl} grain size is larger than the critical grain size linearly proportional to the strip thickness.11sciescopuskc
Ordered Phases in Fe-Si Alloys: A First-Principles Study
No full textIt is known that the formation of ordered phases causes the brittleness of electrical steels. We employed first-principles method in order to examine the possibility of the ordered-phases formation in Fe-Si alloys. It is found that the D0(3)-like ordered configuration is most stable among other atomic configurations in the ferromagnetic state. In the paramagnetic state, for low Si concentration, the stability of the ordered configurations is comparable to that of disordered ones. However, as Si content increases, the B2 ordered phase as well as the D0(3) phase becomes more stable than the disordered ones.11Nsciescopuskc
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