Abnormal Grain Growth of Hi–B Steel in the Secondary Recrystallization

Su, Chengqun; Zhao, Gang; Xiao, Huan; Lan, Yuzhe; Huang, Fangyu

doi:10.1007/s13632-018-0467-9

Cited by 10 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They assumed that Ʃ7 and Ʃ9 boundaries have the highest mobility/energy and support Goss AGG. However, some argued the significance of CSL role in AGG and suggested a bigger role of high angle grain boundary (HAGB) misorientation of (20°-45°) in Goss grain's AGG [13,14,17,30,31]. However, criticism of this concept grew when it was experimentally demonstrated that only a few grains underwent AGG, although more the 50% of the grain boundaries had 20-45° misorientation angles [11,19].…”

mentioning

confidence: 99%

Mechanistic approach of Goss abnormal grain growth in electrical steel: Theory and argument

et al. 2020

View full text Add to dashboard Cite

The first Si-Fe electrical steel was produced in 1905, and the grain-oriented steel was discovered in 1930 after Goss demonstrated how optimal combinations of heat treatment and cold rolling could produce a texture giving Si-Fe strip good magnetic properties when magnetised along its rolling direction. This technology has reduced the power loss in transformers greatly and remains the basis of the manufacturing process today. Since then many postulations reported on the mechanism on abnormal grain growth (AGG) which is the key for Si-Fe superior magnetic properties, however, none have provided a concrete understanding of this phenomenon. Here, we established and demonstrated a new theory that underlines the fundamental mechanistic approach of abnormal grain growth in 3% Si-Fe steel. It is demonstrated, that the external heat flux direction applied during annealing and Si atom positions in the solid solution disordered a-Fe cube unit cell that cause lattice distortions and BCC symmetry reduction are the most influential *Manuscript Click here to download Manuscript: Manuscript.pdf Click here to view linked References factors in the early stage of Goss AGG than what was previously thought to be dislocation related stored energy, grain boundary characteristics and grain size/orientation advantages.

show abstract

mentioning

confidence: 99%

Mechanistic approach of Goss abnormal grain growth in electrical steel: Theory and argument

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Until recently, only AST Company in Italy, which was acquired by Thyssen Steel Company in Germany, used the compact strip production (CSP) process to manufacture Hi-B steel, and it was applied for related patents in this research field [8][9][10][11][12]. Furthermore, a lot of research work in this field has been carried out by NERC-CCT, WISCO, NEU, and WUST in China, and so on [13][14][15][16][17][18][19][20][21][22][23]. Especially, WISCO has successfully carried out the industrial production of Hi-B steel using the CSP process with the acquired inhibitor method [15].…”

Section: Of 14mentioning

confidence: 99%

Primary Recrystallization Behaviors of Hi-B Steel with Lower Initial Nitrogen Produced by the Thin Slab Casting and Rolling Process

Qiao

et al. 2021

Metals

View full text Add to dashboard Cite

Based on low-temperature high-permeability grain-oriented silicon steel designed with an initial nitrogen content of 0.0055% and produced by the thin slab casting and rolling process, the effect of total nitrogen content and nitriding temperature on primary recrystallization microstructure and texture were studied by optical microscope, scanning electron microscope, transmission electron microscope, and electron backscatter diffraction. The nitriding temperature affects the primary recrystallization behaviors significantly, while the total nitrogen content has a small effect. As the nitriding temperature is 750–850 °C, the average primary grain size and its inhomogeneity factor are about 26.58–26.67 μm and 0.568–0.572, respectively. Moreover, the texture factor is mostly between 0.15 and 0.40. Because of the relatively sufficient inhibition ability of inherent inhibitors in a decarburized sheet, the nitriding temperature (750–850 °C) affects the primary recrystallization microstructure and texture slightly. However, as the nitriding temperature rises to 900–950 °C, the average primary grain size and its inhomogeneity factor increase to 27.75–28.26 μm and 0.575–0.578, respectively. Furthermore, because of the great increase on the area fraction of {112} <110> grains, part of texture factor is increased sharply. Therefore, in order to obtain better primary grain size and homogeneity, better texture composition, and stability of the decarburized sheet, the optimal nitriding temperature is 750–850 °C.

show abstract

“…Abnormal grain growth (AGG) refers to a subset of grains that will grow excessively at the expense of surrounding normal grains leading to an obvious size advantage of the abnormal grains [1,2]. The AGG phenomenon has been observed in many materials, including steels [3][4][5][6][7][8][9][10][11], aluminum alloys [12,13], super alloys [14][15][16], ceramics [17][18][19][20][21], nanocrystalline materials [22][23][24][25] as well as thin films [25][26][27][28]. AGG is of important technological relevance and must be controlled in the thermal processing of polycrystalline materials.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Furnish et al [23] showed that AGG leads to fatigue failure in nanocrystalline Ni-Fe. In some cases, however, AGG is a useful microstructure engineering concept, also known as secondary recrystallization, e.g., for the development of Goss or cube textures in electrical steels [4,[9][10][11]29]. Similarly, AGG is beneficial for magnetostrictive Fe-Ga alloys as well as Fe-based shape memory alloys [30,31].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phase Field Modelling of Abnormal Grain Growth

2019

View full text Add to dashboard Cite

Heterogeneous grain structures may develop due to abnormal grain growth during processing of polycrystalline materials ranging from metals and alloys to ceramics. The phenomenon must be controlled in practical applications where typically homogeneous grain structures are desired. Recent advances in experimental and computational techniques have, thus, stimulated the need to revisit the underlying growth mechanisms. Here, phase field modelling is used to systematically evaluate conditions for initiation of abnormal grain growth. Grain boundaries are classified into two classes, i.e., high- and low-mobility boundaries. Three different approaches are considered for having high- and low-mobility boundaries: (i) critical threshold angle of grain boundary disorientation above which boundaries are highly mobile, (ii) two grain types A and B with the A–B boundaries being highly mobile, and (iii) three grain types, A, B and C with the A–B boundaries being fast. For these different scenarios, 2D simulations have been performed to quantify the effect of variations in the mobility ratio, threshold angle and fractions of grain types, respectively, on the potential onset of abnormal grain growth and the degree of heterogeneity in the resulting grain structures. The required mobility ratios to observe abnormal grain growth are quantified as a function of the fraction of high-mobility boundaries. The scenario with three grain types (A, B, C) has been identified as one that promotes strongly irregular abnormal grains including island grains, as observed experimentally.

show abstract

Abnormal Grain Growth of Hi–B Steel in the Secondary Recrystallization

Cited by 10 publications

References 17 publications

Mechanistic approach of Goss abnormal grain growth in electrical steel: Theory and argument

Mechanistic approach of Goss abnormal grain growth in electrical steel: Theory and argument

Primary Recrystallization Behaviors of Hi-B Steel with Lower Initial Nitrogen Produced by the Thin Slab Casting and Rolling Process

Phase Field Modelling of Abnormal Grain Growth

Contact Info

Product

Resources

About