Prediction of spring-back behavior in high strength low carbon steel sheets

The low-carbon steel (~0.12 wt%) with complete martensite structure, obtained by quenching, was cold rolled to get the high-strength steel sheets. Then, the mechanical properties of the sheets were measured at different angles to the rolling direction, and the microstructural evolution of low-carbon martensite with cold rolling reduction was observed. The results show that the hardness and the strength gradually increase with increasing rolling reduction, while the elongation and impact toughness obviously decrease. The strength of the sheets with the same rolling reduction are different at the angles of 0°, 45°, and 90° to the rolling direction. The tensile strength (elongation) along the rolling direction is higher than that in the other two directions, but the differences between them are not obvious. When the aging was performed at a low temperature, the strength of the initial martensite and deformed martensite increased with increasing aging time during the early stages of aging, followed by a gradual decrease with further aging. However, the elongation increases with increasing aging time. The change of hardness is consistent with that of strength for the cold-rolled martensite, while the hardness of the initial martensite decreases gradually with increasing aging time.

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The study of spring-back in wipe-bending processes for perforated components

Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture ◽

10.1177/0954405411403253 ◽

2011 ◽

Vol 225 (11) ◽

pp. 2007-2014 ◽

Cited By ~ 2

Author(s):

M A Farsi ◽

B Arezoo ◽

V Alizadeh ◽

S Mirzaee

Keyword(s):

Finite Element ◽

Carbon Steel ◽

Sheet Metal ◽

Low Carbon Steel ◽

High Strength ◽

Low Carbon ◽

Low Alloy Steel ◽

Spring Back ◽

Bending Process ◽

Component Material

Bending is one of the processes frequently used during manufacturing of sheet-metal components. Spring-back in bending operations is an important issue when producing precision parts. This issue becomes even more important when the component has any kind of hole on the bending surface. Such components are the focus of study in this paper. Many parameters affect spring-back in the bending process; in the present work, perforated components with an oblong cut are selected, and the influence of cut size, die radius, clearance, and component material on the value of the spring-back in a wipe-bending process are studied. Four different hole sizes, three die radii and clearance, and two different steel materials (high-strength low-alloy steel and low-carbon steel) are used in experiments and finite-element simulations. Results show these parameters have effect on the amount of spring-back in the wipe-bending process.

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Effect of Niobium Addition on the Texture Formation of High Strength Cold-Rolled Low Carbon Steel Sheets

Materials Science Forum - Recrystallization and Grain Growth III ◽

10.4028/0-87849-443-x.425 ◽

2007 ◽

pp. 425-430

Author(s):

Hiromi Yoshida ◽

Kaneharu Okuda ◽

Hidetaka Kawabe ◽

Toshiaki Urabe ◽

Yasushi Tanaka ◽

...

Keyword(s):

Carbon Steel ◽

Low Carbon Steel ◽

High Strength ◽

Texture Formation ◽

Low Carbon ◽

Steel Sheets ◽

Cold Rolled

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Effect of Niobium Addition on the Texture Formation of High Strength Cold-Rolled Low Carbon Steel Sheets

Materials Science Forum ◽

10.4028/www.scientific.net/msf.558-559.425 ◽

2007 ◽

Vol 558-559 ◽

pp. 425-430 ◽

Cited By ~ 6

Author(s):

Hiromi Yoshida ◽

Kaneharu Okuda ◽

Hidetaka Kawabe ◽

Toshiaki Urabe ◽

Yasushi Tanaka ◽

...

Keyword(s):

Carbon Steel ◽

Low Carbon Steel ◽

Rolling Texture ◽

High Strength ◽

Texture Formation ◽

Low Carbon ◽

Steel Sheets ◽

Cold Rolled ◽

Cold Rolling Texture ◽

Nb Addition

The effect of niobium (Nb) addition on recrystallization texture formation in cold-rolled low carbon steel sheets containing 2% manganese (Mn) was investigated. The microstructures of hot-bands were significantly refined by Nb addition, which led to the development of the cold-rolling texture in both the γ-fiber (<111>//ND-fiber) and the α-fiber (<110>//RD-fiber). Recrystallization was retarded by Nb addition, in particular, the growth of <110>//ND grains was retarded. However, the γ-fiber and {112}<110> grains developed during annealing even in the intercritical (α-γ) region. Consequently, the r-value increased as the content of Nb was increased due to the development of the intensity ratio of the <111>//ND texture to the <100>//ND texture, which is desirable for deep-drawable high strength steel sheets.

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