Orientation dependence of stored energy of cold work in semi-processed electrical steels after temper rolling

2006 ◽  
Vol 427 (1-2) ◽  
pp. 301-305 ◽  
Author(s):  
S.F. Castro ◽  
J. Gallego ◽  
F.J.G. Landgraf ◽  
H.-J. Kestenbach
Keyword(s):  
Cold Work ◽  
Orientation Dependence ◽  
Temper Rolling ◽  
Stored Energy ◽  
Electrical Steels

Goss Texture Formation by Strain Induced Boundary Migration in Semi-Processed Nonoriented Electrical Steels

2012 ◽  
Vol 715-716 ◽  
pp. 837-842 ◽  
Author(s):  
Jong Tae Park ◽  
Kyu Seok Han
Keyword(s):  
Boundary Migration ◽  
Annealing Treatment ◽  
Energy Difference ◽  
Rolling Reduction ◽  
Temper Rolling ◽  
Texture Formation ◽  
Stored Energy ◽  
Goss Texture ◽  
Final Annealing ◽  
Electrical Steels

Semi-processed nonoriented electrical steels are very attractive products whose magnetic properties are significantly improved through annealing treatment in customers plant. The improvement is due to strong Goss texture formation by strain induced boundary migration (SIBM). In order to the effect of temper rolling reduction on the strengthening of Goss texture, temper rolling reduction was changed in the range of 2% to 8%. The annealing times was changed from 10 minutes to 180 minutes. A mechanism of grain growth during SIBM is suggested from our experimental data. In the specimen temper-rolled by 2%, relatively strong {111}<112> texture develops, whereas in the specimens temper-rolled by 4% through 8%, strong Goss texture develops as a result of SIBM during final annealing. It can be found from observed EBSD data that the Goss grains have the lowest stored energy in all temper-rolled specimens, which is confirmed by average image quality value in EBSD measurements. However, for the Goss grains to grow preferentially, stored energy difference between Goss grains and their neighboring grains may have to be higher than a certain critical value.

Order-disorder phenomena in α -brass - III. Influence of plastic deformation

1960 ◽  
Vol 257 (1290) ◽  
pp. 363-385 ◽  
Keyword(s):  
Plastic Deformation ◽  
Cold Work ◽  
Stored Energy ◽  
High Concentration ◽  
Complex Behaviour ◽  
Second Stage ◽  
Third Stage ◽  
Anneal Hardening ◽  
Two Stages ◽  
Degree Of Order

The evolution of stored energy during heating for specimens of deformed α-brass is quite different from that previously observed for pure metals; the stored energy is much larger and at least three stages of evolution exist. These have been studied for deformation in torsion and tension and the results correlated with measurements of electrical resistivity, density and hardness. The large release of energy in the first two stages is attributed mainly to the return of order destroyed by plastic deformation; the degree of disorder after heavy cold work is much greater than after quenching (part II). However, slight deformation (10% tension) increases the degree of order slightly. The first stage of energy release, below 120 °C, is probably due to rapid reordering assisted by vacancies created during deformation. The second stage represents the bulk of the reordering and some recovery involving rearrangement and annihilation of dislocations. The deformed specimens are probably strain-aged and thus recovery is accompanied by the dispersal of atmospheres of zinc which increases resistivity and decreases density, to some extent counteracting the effects of recovery. The balance of these three processes in stage 2 causes complex behaviour, the magnitude and even the sign of some changes in properties varies with the deformation. Reordering is complete before the beginning of the third stage of further recovery and recrystallization, in which dispersal of atmospheres is again important. Comparison of measurements of energy, resistivity and density suggests that the high concentration of stacking faults contributes to the resistivity. Anneal hardening is observed for the higher deformations and the maximum hardness coincides with the maximum degree of order.

scholarly journals Improving the Magnetic Properties of Non-Oriented Electrical Steels by Secondary Recrystallization Using Dynamic Heating Conditions

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1914 ◽  
Author(s):  
Ivan Petryshynets ◽  
František Kováč ◽  
Branislav Petrov ◽  
Ladislav Falat ◽  
Viktor Puchý
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Boundary Migration ◽  
Cold Work ◽  
Secondary Recrystallization ◽  
Coarse Grained ◽  
High Heating Rate ◽  
Electrical Steels ◽  
Heat Treated ◽  
Dynamic Heating

In the present work, we have used unconventional short-term secondary recrystallization heat treatment employing extraordinary high heating rate to develop coarse-grained microstructure with enhanced intensity of rotating cube texture {100}<011> in semi-finish vacuum degassed non-oriented electrical steels. The soft magnetic properties were improved through the increase of grains size with favourable cube crystallographic orientation. The appropriate final textural state of the treated experimental steels was achieved by strain-induced grain boundary migration mechanism, activated by gradient of accumulated stored deformation energy between neighbouring grains after the application of soft cold work, combined with steep temperature gradient during subsequent heat treatment under dynamic heating conditions. The materials in our experimentally prepared material states were mounted on the stator and rotor segments of electrical motors and examined for their efficiency in real operational conditions. Moreover, conventionally long-term heat treated materials, prepared in industrial conditions, were also tested for reference. The results show that the electrical motor containing the segments treated by our innovative approach, exhibits more than 1.2% higher efficiency, compared to the motor containing conventionally heat treated materials. The obtained efficiency enhancement can be directly related to the improved microstructural and textural characteristics of our unconventionally heat treated materials, specifically the homogenous coarse grained microstructure and the high intensity of cube and Goss crystallographic texture.

Lattice orientation dependence of the stored energy during cold-rolling of polycrystalline steels

2001 ◽  
Vol 49 (19) ◽  
pp. 4079-4088 ◽  
Author(s):  
S. Diligent ◽  
E. Gautier ◽  
X. Lemoine ◽  
M. Berveiller
Keyword(s):  
Cold Rolling ◽  
Orientation Dependence ◽  
Lattice Orientation ◽  
Stored Energy

A Recrystallisation Based Investigation for Efficiency of Processing Routes during Equal Channel Angular Extrusion

2004 ◽  
Vol 467-470 ◽  
pp. 1325-1332 ◽  
Author(s):  
Satyam Suwas ◽  
André Eberhardt ◽  
László S. Tóth ◽  
Jean-Jacques Fundenberger ◽  
Thierry Grosdidier
Keyword(s):  
Differential Scanning Calorimetry ◽  
Grain Refinement ◽  
Equal Channel Angular Extrusion ◽  
Cold Work ◽  
Stacking Fault ◽  
Stored Energy ◽  
Scanning Calorimetry ◽  
Angular Extrusion ◽  
Refinement Process ◽  
Stacking Fault Energies

The amount of stored energy of cold work for the processing routes A and Bc of Equal Channel Angular Extrusion (ECAE) process has been measured using differential scanning calorimetry. The study is preceded by the effect of amount of ECAE deformation on materials of different stacking fault energies, namely Cu and Ag. The results indicate that the different processing routes have significant effect on the stored energy, which is likely to affect the grain refinement process.

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