scholarly journals Numerical Analysis of Edge Cracking in High-Silicon Steel during Cold Rolling with 3D Fracture Locus

2021 ◽  
Vol 11 (18) ◽  
pp. 8408
Author(s):  
Yong-Hoon Roh ◽  
Sang Min Byon ◽  
Youngseog Lee
Keyword(s):  
Cold Rolling ◽  
Work Roll ◽  
Silicon Steel ◽  
Fracture Locus ◽  
Roll Bending ◽  
High Silicon Steel ◽  
Notch Length ◽  
Fracture Tests ◽  
High Silicon ◽  
Edge Cracking

In this study, a 3D fracture locus of high-silicon steel strip was constructed through a series of fracture tests with specimens of various shapes and corresponding finite element (FE) simulations of the fracture tests. A series of FE analyses coupled with the developed fracture locus was conducted, and the effect of the secondary roll-bending ratio (defined as L2/R2, where L2 and R2, respectively, denote the secondary work roll barrel length and the radius of the convex curvature of the work roll surface profile emulating positive roll bending) and the initial notch length on edge cracking in the strip during cold rolling was investigated. The results reveal that the 2D fracture locus that does not include the Lode angle parameter (varying between −0.81 and 0.72 during cold rolling) overestimates the edge cracking in the range of 13.1–22.2%. The effect of the initial notch length on the length of crack grown in the transverse direction of the strip during cold rolling is greatest when the ratio L2/R2 is 0.12.

Reversible cold rolling of thin high-silicon steel strip

2014 ◽  
Vol 44 (10) ◽  
pp. 764-768
Author(s):  
V. A. Pimenov ◽  
Yu. Yu. Babushko ◽  
S. V. Bakhtin
Keyword(s):  
Cold Rolling ◽  
Steel Strip ◽  
Silicon Steel ◽  
High Silicon Steel ◽  
High Silicon

Fe-6.5wt.%Si High Silicon Steel Sheets Produced by Cold Rolling

2010 ◽  
Vol 638-642 ◽  
pp. 1428-1433 ◽  
Author(s):  
Feng Ye ◽  
Y.F. Liang ◽  
Y.L. Wang ◽  
Jun Pin Lin ◽  
G.L. Chen
Keyword(s):  
Cold Rolling ◽  
Room Temperature ◽  
Thin Sheet ◽  
Silicon Steel ◽  
Magnetic Devices ◽  
Steel Sheets ◽  
High Silicon Steel ◽  
Rolling Method ◽  
High Silicon ◽  
Si Content

High silicon steel with Si content of 6.5wt.% is perspective to be applied in magnetic devices at high frequencies. It is very hard to produce Fe-6.5wt%Si alloy thin sheet by conventional hot-cold rolling method because of its embrittlement at room temperature resulted from the formation of intermetallic phases like B2 and D03. In this paper, embrittlement mechanism, rolling processes, and magnetic properties for the cold rolled Fe-6.5wt.% Si alloy sheets are discussed. Our study indicates that thermal mechanical treatments can improve the ductility of the Fe-6.5wt.%Si alloy. The Fe-6.5wt.%Si alloy sheets of 0.05 mm thickness can be successfully obtained after hot-cold rolling and heat treatments. Lamination pieces can be punched directly from the sheets. Tensile strength as high as 1048MPa and elongation over 3% were measured at room temperature.

Effect of Finishing Temperature on Texture Evolution and Magnetic Properties in Heavy Cold Rolled High Silicon Steel Thin Sheets

2011 ◽  
Vol 306-307 ◽  
pp. 381-384
Author(s):  
Jin Long Liu ◽  
Yu Hui Sha ◽  
Fang Zhang ◽  
Yong Chuang Yao ◽  
Ji Chao Li ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Cold Rolling ◽  
Recrystallization Texture ◽  
Texture Evolution ◽  
Thin Sheet ◽  
Rolling Texture ◽  
Silicon Steel ◽  
Final Annealing ◽  
High Silicon Steel ◽  
High Silicon

0.2mm-thick high silicon steel thin sheet under 94% cold rolling reductions has been successfully produced by conventional rolling method. Texture evolution during hot rolling, cold rolling and final annealing as well as magnetic properties has been investigated with emphasis on the effect of finishing temperature. It is found that a favorable strong {001}<210> recrystallization texture and evidently improved magnetic properties can be obtained at the finishing temperature of 900°C, which is in contrast with relatively strong detrimental {111}<112> and weak {001}<210> recrystallization texture at the finishing temperature of 700°C. Effects of finishing temperature can be explained in terms of the cold rolling texture due to different texture morphology in hot bands.

A roll-bending approach to suppress the edge cracking of silicon steel in the cold rolling process

2020 ◽  
Vol 235 (1-2) ◽  
pp. 112-124
Author(s):  
Sang Min Byon ◽  
Yong-Hoon Roh ◽  
Zhaorui Yang ◽  
Youngseog Lee
Keyword(s):  
Finite Element ◽  
Cold Rolling ◽  
Crack Growth ◽  
Steel Strip ◽  
Work Roll ◽  
Growth Direction ◽  
Element Analysis ◽  
Roll Bending ◽  
Crack Growth Direction ◽  
Edge Cracking

The range of roll-bending that inhibits the edge cracking of high-silicon (3.0 wt%) steel strip during cold rolling was investigated by performing a pilot cold rolling test. In the rolling test, roll-bending was emulated by lathe-machining the work roll surface to be concave (corresponding to negative roll-bending) or convex (corresponding to positive roll-bending). Crack growth length that propagated during rolling and crack growth direction were measured. Three-dimensional finite element analysis coupled with ductile fracture criterion was conducted to predict the crack growth length and crack growth direction. The reliability of the finite element analysis was verified by comparing the predictions with measurements. A series of finite element simulations were then conducted with different levels of roll-bending, expressed as the ratio of the radius of curvature of work roll surface ( R) to its barrel length ( L).The difference between the measurements and the predictions of the crack growth length and crack growth direction was 6.5% and 8.3%, respectively, when the initial notch length was 6 mm. Even if a high reduction ratio for a given pass was applied to the silicon steel strip, edge cracking did not occur if the L/ R ratio was less than −0.15, with a negative value corresponding to a concave surface profile, representing negative bending.

Atomic scale observations of bainite transformation in a high carbon high silicon steel

2007 ◽  
Vol 55 (1) ◽  
pp. 381-390 ◽  
Author(s):  
F CABALLERO ◽  
M MILLER ◽  
S BABU ◽  
C GARCIAMATEO
Keyword(s):  
Silicon Steel ◽  
Atomic Scale ◽  
High Carbon ◽  
Bainite Transformation ◽  
High Silicon Steel ◽  
High Silicon

Crack Formation Mechanism of High Silicon Steel during Twin-Roll Strip Casting

2017 ◽  
Vol 898 ◽  
pp. 1276-1282
Author(s):  
Wen Li Hu ◽  
Yuan Xiang Zhang ◽  
Guo Yuan ◽  
Guo Dong Wang
Keyword(s):  
Formation Mechanism ◽  
Crack Formation ◽  
Silicon Steel ◽  
Strip Casting ◽  
Dominant Factor ◽  
Transverse Cracks ◽  
High Silicon Steel ◽  
High Silicon ◽  
Gas Gap ◽  
Twin Roll

High silicon steel was fabricated by twin-roll strip casting. The cracks on the surfaces of the processed strips were obtained and analyzed by digital camera after series of surface treatment. Optical microscopy (OM) and scanning electron microscopy (SEM) were used to observe and characterize the microstructure nearby crack and fracture surface along the normal direction, respectively, and the crack formation mechanism was further analyzed in conjunction with processing parameters utilized during twin-roll strip casting process. The results indicated that morelongitudinal cracks along the rolling direction were observed in comparison with transverse cracks along the transverse direction on the strip surfaces. Trans granular and intergranular fracture modes both worked during the formations of longitudinal and transverse cracks on the processed strips. The dominant factor causing the formation of crack on the surface of the processed strips was the inhomogeneous transfer of heat during casting and rolling. The inhomogeneous transfer of heat induced by gas gap during casting resulted in variations of dendrite length and secondary dendrite spacing (SDAS). Meanwhile, the casting velocity influenced the formation of gas gap, which further influenced the thermal contraction. So the control of velocity of casting above a certain level proved beneficial to enhancing the performance of strip casting and to improving the quality of strip products.

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