The<001>orientation of the Goss texture aligned with the rolling direction is the most easily magnetized direction,effectively enhancing the magnetic properties of non-oriented silicon steel.In the present study...The<001>orientation of the Goss texture aligned with the rolling direction is the most easily magnetized direction,effectively enhancing the magnetic properties of non-oriented silicon steel.In the present study,an ultra-thin high-silicon sheet of 0.2 mm with a strong Goss texture was successfully fabricated using a two-stage rolling method,achieving superior magnetic properties.The combination of suitable primary rolling reduction and intermediate annealing proved beneficial in promoting the formation of Goss texture.Electron back scatter diffraction(EBSD)was used to characterize micro-shear bands within deformed grains of secondary rolled sheets.Observations revealed that the recrystallized Goss nucleus originated from the Goss substructure of shear bands within deformed{111}<112>grains during the initial stages of recrystallization.The influence of stored energy and grain size on texture evolution was thoroughly investigated using quasi-in situ EBSD during recrystallization.In the initial stages,large deformed{111}<112>and near{111}<112>grains with high stored energy facilitated nucleation and growth of Goss and near-Goss grains within shear bands and reduced grain boundary nucleation.In the later stages,large deformed grains with low stored energy underwent a strain-induced grain boundary migration mechanism to nucleate.During the recrystallization,many recrystallized Goss and near-Goss grains clustered together,with Goss grains rotating towards near-Goss orientation.The resulting annealed ultra-thin 0.2 mm sheet with a pronounced Goss texture exhibited superior magnetic properties.展开更多
In this study, high- and low-grade grain-oriented electrical steels were used as the initial materials to produce 0.08-mm-thick sheet with one-step cold-rolling method. Electron backscattering diffraction analysis tec...In this study, high- and low-grade grain-oriented electrical steels were used as the initial materials to produce 0.08-mm-thick sheet with one-step cold-rolling method. Electron backscattering diffraction analysis technique and X-ray diffraction texture analysis technique were adopted to investigate the effect of initial Goss texture sharpness on texture evolution and magnetic properties of ultra-thin grain-oriented electrical steel. The results showed that primary recrystal- lization and secondary recrystallization were the main processes that occurred during annealing. The induced factors for secondary recrystallization of two grades samples were not Consistent. The high-grade samples presented texture induction mechanism, while the low-grade samples revealed strong surface-energy induction mechanism. The initial Goss texture sharpness had a great impact on texture evolution and magnetic properties of ultra-thin grain-oriented electrical steel. The Goss texture component formed after primary recrystallization was stronger, and better magnetic properties were obtained at low frequencies. For low-grade samples, secondary recrystallization enhanced the intensity of Goss texture, and both grain size and texture contributed to better high-frequency magnetic properties after secondary recrystallization. By controlling the annealing process, the magnetic properties of low-grade products could be significantly improved, thus achieving conversion from low-grade to high-grade products.展开更多
With the help of electron back scattering diffraction techniques and field emission microscope, the misorienta- tion and the precipitation environment of Goss grains in conventional grain-oriented steel were observed ...With the help of electron back scattering diffraction techniques and field emission microscope, the misorienta- tion and the precipitation environment of Goss grains in conventional grain-oriented steel were observed and investigated at the initial stage of secondary recrystallization. It reveals that the abnormal Goss grains have a high fraction of high angle boundaries ranging from 25 to 40 deg. The most important observation is that some of {110}〈001〉 grains in matrix indicated higher particle density than their neighbor grains during final annealing at 875℃ before secondary recrystallization, which could create a favorable environment for their abnormal grain growth. Based on misorientation and precipitation results, the abnormal growth mechanism of Goss grains was sketched.展开更多
To avoid the unfavorable effect of precipitates on magnetic properties,low addition of 0.16 wt%NbC was employed in Fe_(82.5)Ga_(17.5)alloy,and 0.27 mm sheets were successfully prepared by a rolling process.Strong Goss...To avoid the unfavorable effect of precipitates on magnetic properties,low addition of 0.16 wt%NbC was employed in Fe_(82.5)Ga_(17.5)alloy,and 0.27 mm sheets were successfully prepared by a rolling process.Strong Goss texture was obtained in Fe-Ga sheets by two-stage annealing process.The sulfur annealing in quartz ampoules was made to produce the preferred growth of Goss texture,with a 51%increase in the observed saturation magnetostriction,from 87×10^(-6)in the Ar-annealed sheets to 132×10^(-6)in the S-annealed sheets.However,large amounts of S-rich and Nb-rich precipitates were formed in the S-annealed sheets.High-temperature annealing of the S-annealed sheets at 1,200℃under a flow hydrogenargon atmosphere could effectively eliminate the precipitates and promote the selective growth of(110)grains due to the low surface energy.Large grains(~2 cm)of secondary recrystallization were achieved in the final annealed sheets,with the maximum average saturation magnetostriction of 180×10^(-6).展开更多
基金financially supported by the project for the full-time introduction of national high-level innovative technological talents in Hebei province(No.2024HBQZY CXY039)the Funds for Creative Research Groups of China(No.51921001)the Key R&D Program of Jiangxi Province of China(No.20212BBE51019)。
文摘The<001>orientation of the Goss texture aligned with the rolling direction is the most easily magnetized direction,effectively enhancing the magnetic properties of non-oriented silicon steel.In the present study,an ultra-thin high-silicon sheet of 0.2 mm with a strong Goss texture was successfully fabricated using a two-stage rolling method,achieving superior magnetic properties.The combination of suitable primary rolling reduction and intermediate annealing proved beneficial in promoting the formation of Goss texture.Electron back scatter diffraction(EBSD)was used to characterize micro-shear bands within deformed grains of secondary rolled sheets.Observations revealed that the recrystallized Goss nucleus originated from the Goss substructure of shear bands within deformed{111}<112>grains during the initial stages of recrystallization.The influence of stored energy and grain size on texture evolution was thoroughly investigated using quasi-in situ EBSD during recrystallization.In the initial stages,large deformed{111}<112>and near{111}<112>grains with high stored energy facilitated nucleation and growth of Goss and near-Goss grains within shear bands and reduced grain boundary nucleation.In the later stages,large deformed grains with low stored energy underwent a strain-induced grain boundary migration mechanism to nucleate.During the recrystallization,many recrystallized Goss and near-Goss grains clustered together,with Goss grains rotating towards near-Goss orientation.The resulting annealed ultra-thin 0.2 mm sheet with a pronounced Goss texture exhibited superior magnetic properties.
基金financially supported by the National High Technology Research and Development Program of China(Grant No.2012AA03A505)
文摘In this study, high- and low-grade grain-oriented electrical steels were used as the initial materials to produce 0.08-mm-thick sheet with one-step cold-rolling method. Electron backscattering diffraction analysis technique and X-ray diffraction texture analysis technique were adopted to investigate the effect of initial Goss texture sharpness on texture evolution and magnetic properties of ultra-thin grain-oriented electrical steel. The results showed that primary recrystal- lization and secondary recrystallization were the main processes that occurred during annealing. The induced factors for secondary recrystallization of two grades samples were not Consistent. The high-grade samples presented texture induction mechanism, while the low-grade samples revealed strong surface-energy induction mechanism. The initial Goss texture sharpness had a great impact on texture evolution and magnetic properties of ultra-thin grain-oriented electrical steel. The Goss texture component formed after primary recrystallization was stronger, and better magnetic properties were obtained at low frequencies. For low-grade samples, secondary recrystallization enhanced the intensity of Goss texture, and both grain size and texture contributed to better high-frequency magnetic properties after secondary recrystallization. By controlling the annealing process, the magnetic properties of low-grade products could be significantly improved, thus achieving conversion from low-grade to high-grade products.
基金supported by the National Natural Science Foundation of China (Grant No.50871015)
文摘With the help of electron back scattering diffraction techniques and field emission microscope, the misorienta- tion and the precipitation environment of Goss grains in conventional grain-oriented steel were observed and investigated at the initial stage of secondary recrystallization. It reveals that the abnormal Goss grains have a high fraction of high angle boundaries ranging from 25 to 40 deg. The most important observation is that some of {110}〈001〉 grains in matrix indicated higher particle density than their neighbor grains during final annealing at 875℃ before secondary recrystallization, which could create a favorable environment for their abnormal grain growth. Based on misorientation and precipitation results, the abnormal growth mechanism of Goss grains was sketched.
基金the National Basic Research Program of China(No.2011CB606304)the National Natural Science Foundation of China(No.51271019)+1 种基金the Fundamental Research Funds for the Central Universities(No.FRFSD-12-025A)the National Natural Science Foundation for Postdoctoral Scientists of China(No.2011M500229)。
文摘To avoid the unfavorable effect of precipitates on magnetic properties,low addition of 0.16 wt%NbC was employed in Fe_(82.5)Ga_(17.5)alloy,and 0.27 mm sheets were successfully prepared by a rolling process.Strong Goss texture was obtained in Fe-Ga sheets by two-stage annealing process.The sulfur annealing in quartz ampoules was made to produce the preferred growth of Goss texture,with a 51%increase in the observed saturation magnetostriction,from 87×10^(-6)in the Ar-annealed sheets to 132×10^(-6)in the S-annealed sheets.However,large amounts of S-rich and Nb-rich precipitates were formed in the S-annealed sheets.High-temperature annealing of the S-annealed sheets at 1,200℃under a flow hydrogenargon atmosphere could effectively eliminate the precipitates and promote the selective growth of(110)grains due to the low surface energy.Large grains(~2 cm)of secondary recrystallization were achieved in the final annealed sheets,with the maximum average saturation magnetostriction of 180×10^(-6).
