scholarly journals Micro Characterization of Hot-Rolled Plate of Nb-Bearing Grain-Oriented Silicon Steel

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 429
Author(s):  
Yong Wang ◽  
Guangqiang Li ◽  
Chengyi Zhu ◽  
Xinbin Liu ◽  
Yulong Liu ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Bearing Steel ◽  
Silicon Steel ◽  
Rolled Plate ◽  
Goss Texture ◽  
Inhibiting Effect ◽  
Nb Content ◽  
Hot Rolled ◽  
Content Range

In this study, niobium was added into grain-oriented silicon steels, four Nb-bearing hot-rolled bands with Nb content range from 0–0.025 wt% were prepared and a detailed study of the micro characterization (microstructure, texture and precipitates) of hot-rolled bands was carried out by various analysis methods, such as EBSD and TEM. The results indicate that the precipitates in Nb-free steel are MnS and AlN; however, in the Nb-bearing steel they are MnS, AlN and Nb(C, N). The precipitates are finer and more dispersed in Nb-bearing steel, and a stronger pining force was obtained, which contributes to the finer microstructure and less recrystallization fractions of the hot-rolled bands. A larger volume fraction and stronger intensity of Goss texture is presented in steel with 0.025 wt% Nb due to the effective inhibiting effect. However, it has little effect on the changes of microstructure and texture when the Nb content is more than 0.009 wt%.

Characterization of Global and Local Textures in Hot Rolled CGO Fe3%Si

2006 ◽  
Vol 509 ◽  
pp. 25-30 ◽  
Author(s):  
Francisco Cruz-Gandarilla ◽  
Thierry Baudin ◽  
Marie Helene Mathon ◽  
Richard Penelle ◽  
Hector Mendoza León ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Distribution Functions ◽  
Processing Route ◽  
Rolled Sheet ◽  
Electron Backscattered Diffraction ◽  
Goss Texture ◽  
Hot Rolled ◽  
Global And Local ◽  
Half Thickness

The present work is an attempt to understand the recrystallisation mechanisms in Fe-3% Si alloys used in transformer cores. After secondary recrystallisation silicon steels exhibit a Goss texture with a more or less important spread depending on the details of the processing route, namely, Conventional Grain Orientation CGO or High Permeability Hi-B. The mechanisms of Goss grain formation during hot rolling and primary recrystallisation, as well as those controlling the first steps of abnormal growth, are not yet well understood. The present work mainly deals with texture characterization of the hot rolled state. Surface, quarter and half thickness samples are prepared from hot-rolled sheet. Global and local textures are characterized by neutron diffraction and electron backscattered diffraction, respectively. The Orientation Distribution Functions and the volume fraction of the different texture components are calculated. The components from global texture measurements are (001)[1-10], (112)[1-10] (α fiber ), (011)[100] (Goss) and (111)[1-21] (111) [1-10](γ fiber). EBSD measurements have shown large variations of texture from the surface to the half thickness of the sheet. These local measurements are related to the global results by rotation about the transverse direction. Moreover, the grain size appears to be inhomogeneous.

Microstructure, Texture and Inhibitors of the As-Cast and Hot Rolled Grain-Oriented Silicon Steel by Strip Casting

2016 ◽  
Vol 852 ◽  
pp. 101-104 ◽  
Author(s):  
Wen Qiang Liu ◽  
Cheng Shuai Lei ◽  
Han Mei Tang ◽  
Hong Yu Song ◽  
Hai Tao Liu
Keyword(s):  
Hot Rolling ◽  
Texture Evolution ◽  
Fiber Texture ◽  
Silicon Steel ◽  
Rolling Reduction ◽  
Recrystallization Annealing ◽  
Goss Texture ◽  
Steel Strips ◽  
Columnar Grains ◽  
Hot Rolled

The microstructure and texture evolution of the as-cast and hot rolled grain-oriented silicon steel strips was investigated, and the precipitation of the inhibitors of the hot rolled strips was clarified. The results showed that the microstructure of the as-cast strip was characterized by coarse columnar grains with strong {001}<0vw> fiber texture. The microstructure of hot rolled strips was composed of ferrite and pearlite and the microstructure was gradually refined with increasing hot rolling reduction. In the hot rolled strips, α and γ fiber textures were enhanced at the expense of initial {001}<0vw> fiber texture and Goss texture was generated in the surface and sub-surface layer with increasing hot rolling reduction. Besides, a great number of dispersed MnS particles with the size of 20-30nm were observed in the hot rolled strips. These MnS particles could act as the effective inhibitors during the second recrystallization annealing of the grain-oriented silicon steel.

Microstructure and texture evolution of medium temperature grain-oriented silicon steel produced by industrialization

2019 ◽  
Vol 116 (6) ◽  
pp. 604 ◽  
Author(s):  
Lifeng Fan ◽  
Liying Jia ◽  
Rong Zhu ◽  
Jianzhong He
Keyword(s):  
Grain Size ◽  
Texture Evolution ◽  
Silicon Steel ◽  
Rolled Strip ◽  
Medium Temperature ◽  
Goss Texture ◽  
Hot Rolled Strip ◽  
Average Grain Size ◽  
Average Size ◽  
Hot Rolled

The grain-oriented silicon steel was produced by medium temperature reheating and two-stage cold rolling process, and the microstructure and texture of all metallurgical processes were studied. The results shown that the microstructure of the hot rolled strip was inhomogeneous in thickness direction, the surface layer was the recrystallized microstructures with average grain size of 42.29 µm, the center layer was fiber structure, and the Goss texture appeared at surface. The primary recrystallized microstructure with average grain size of 16 µm was obtained after decarburization annealing, which characterized by a strong γ-fiber texture and a weak Goss texture. The average size of inhibitors in hot rolled strip and decarburization annealed sheet were 9.078 and 21.691 nm respectively, they were mainly compound of nitride and sulfide with spherical or lump shapes. The coarse Goss grains with average size 17.57 mm were got after secondary recrystallization, and the magnetic induction B8 and iron loss P1.7/50 were 1.885 T and 1.10 W/Kg, respectively.

The Effect of Hot-Rolled Coiling Time on the Texture of a New Cold-Rolled Non-Oriented Electric Steel

2011 ◽  
Vol 194-196 ◽  
pp. 375-378
Author(s):  
Guan Qiao Hu ◽  
Yan Ping Zeng ◽  
Hai Lin Chen
Keyword(s):  
Hot Rolling ◽  
Electrical Steel ◽  
Volume Fraction ◽  
Test Results ◽  
Electric Steel ◽  
Coiling Temperature ◽  
Goss Texture ◽  
Cold Rolled ◽  
Hot Rolled

The effects of hot-rolling coiling time on texture of a new cold-rolled non-oriented electrical steel containing copper were investigated. The test results showed that the final product texture consists of γ-fibr textures, α-fibre textures and Goss. With adding coiling time ,the density of {111}<110> and {112}<110> decreased,the inverse Goss texture {001}<110> increased. The volume fraction of {100} raised with coiling time. As a certain coiling temperature, it can improve the intensity of textures {100},{110}at proper coiling time.

The Influence of Hot Rolling Technological Parameters on Microstructure of Low Temperature Grain-Oriented Silicon Steel

2011 ◽  
Vol 396-398 ◽  
pp. 1841-1845
Author(s):  
Yun Li Feng ◽  
Xue Jing Qi ◽  
Meng Song
Keyword(s):  
Hot Rolling ◽  
Room Temperature ◽  
Secondary Recrystallization ◽  
Silicon Steel ◽  
Rolled Strip ◽  
Technological Parameters ◽  
Coiling Temperature ◽  
Goss Texture ◽  
Gleeble 3500 ◽  
Hot Rolled

The process of hot rolling Fe-3.15% Si steel is simulated by Gleeble-3500 thermal mechanical simulator, the influence of finishing temperature, coiling temperature and cooling rates after rolling on microstructure of Fe-3.15% Si steel are mainly researched, and the influence of hot rolled microstructure on Goss texture, secondary recrystallization and magnetic property are analysed. The results show that the nonuniform microstructures of hot rolled strip play an important role in developing the perfect secondary recrystallization. Fe-3.15% Si steel is rough rolled at 1110°C, finished rolled at 880°C, subsequently cooled to 550°C for coiling at rate of 10°C/s, then air cooled to room temperature. The above mentioned process could produce hot-rolled microstructure which are benefit to formation of Goss texture and the development of perfect secondary recrystallization.

Microstructure and Recrystallization Texture Characterization of Cold-Rolled Dual-Phase Steel

2012 ◽  
Vol 430-432 ◽  
pp. 1223-1226
Author(s):  
Zhi Gang Wang ◽  
Zheng Zhi Zhao ◽  
Ai Min Zhao ◽  
Jie Yun Ye
Keyword(s):  
Deep Drawing ◽  
Recrystallization Texture ◽  
Dual Phase Steel ◽  
Rolled Plate ◽  
Dual Phase ◽  
Dp Steels ◽  
Xrd Techniques ◽  
Hot Rolled ◽  
Texture Characterization

Deep drawing dual phase steel was designed and trial-produced in the laboratory. The microstructure and recrystallization texture was studied using OM,TEM and XRD techniques. The results show that texture components typically in DP steels are γ (<111>//ND) and α (<110>//RD) fibers, which is partly attributed to the precipitation of Mo-based carbides in hot-rolled plate. Besides, {554}<225> and {332}<113> texture components are also founded in deep drawing DP steels, which are beneficial to improvement of drawability. With the increasing of annealing temperature, the tensile strength and elongation of DP steels are increased and decreased, respectively, and the r value is reduced slightly.

scholarly journals Influence of Nb Content on Precipitation, Grain Microstructure, Texture and Magnetic Properties of Grain-Oriented Silicon Steel

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5581
Author(s):  
Yong Wang ◽  
Chengyi Zhu ◽  
Guangqiang Li ◽  
Yulong Liu ◽  
Yu Liu
Keyword(s):  
Magnetic Properties ◽  
Volume Fraction ◽  
Silicon Steel ◽  
Pinning Force ◽  
Final Annealing ◽  
Large Volume Fraction ◽  
Nb Content ◽  
Strong Pinning ◽  
Nb Addition ◽  
Precipitation Microstructure

The effects of Nb content on precipitation, microstructure, texture and magnetic properties of primary recrystallized grain-oriented silicon steel were investigated by various methods. The results show that the precipitates in primary recrystallized sheets are mainly MnS, Nb(C,N), composite precipitates of MnS and AlN, and composite precipitates of Nb(C,N) and AlN. Adding niobium could refine the primary recrystallized microstructure. The steel with 0.009 wt% Nb possesses the finest and the most dispersed precipitates, which contributes to the finest primary recrystallized microstructure due to the strong pinning force. Adding niobium is beneficial to obtain large volume fraction favorable texture for grain-oriented silicon steel, and the effect of Nb addition is not obvious when the content is higher than 0.009 wt%. After final annealing, the steel with 0.009 wt% Nb shows the best magnetic properties, B800 = 1.872 T, P1.7/50 = 1.25 W/kg.

Microstructure and Crystallographic Texture of Oriented Silicon Steel Produced by TSCR

2010 ◽  
Vol 146-147 ◽  
pp. 705-708
Author(s):  
Yong Mei Yu ◽  
Yun Bo Xu ◽  
Chang Sheng Li ◽  
Guo Dong Wang
Keyword(s):  
Silicon Steel ◽  
Texture Gradient ◽  
Goss Texture ◽  
Thin Slab Casting ◽  
Columnar Grains ◽  
Slab Casting ◽  
Cold Rolled ◽  
Rolled Condition ◽  
Hot Rolled ◽  
Equiaxed Grains

The microstructure and textures of oriented silicon steel produced by Thin Slab Casting and Rolling (TSCR) were studied in laboratory. The fractions of equiaxed grains and columnar grains are close to 35% and 65% respectively in as-quenched ingot after being pulled out from the mould. The equiaxed grains and no texture gradient from surface to center can be observed for the 3-pass hot-rolled strips, and the inhomogeneities of microstructure and texture in thickness are relatively clear for the 7-pass samples. The subsurface texture of the hot-rolled sample contains of e (TD// <110>) fibers. The texture of the cold-rolled samples mainly consists of a (<110>//RD) and g (<111>//ND) fibers, and Goss texture ({110}<001>) disappears. The strong a fiber, weak g fiber and minor {001}<110>can be found in all layers in the cold-rolled condition.

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