Warm and Hot Stamping of Ultra High Tensile Strength Steel Sheets Using Resistance Heating

Mori, Ken-ichiro; Maki, Seijiro; Tanaka, Yasunori

doi:10.1016/s0007-8506(07)60085-7

Cited by 282 publications

(145 citation statements)

References 9 publications

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“…Since Troistki's 1963 paper [4] on electroplasticity, the theme soared in popularity for almost two decades, and has experienced a recent resurgence although with revised theoretical understanding the phenomenon's origin [5][6][7]. The concept was traditionally explained to occur by an increased mobility of dislocations caused by the applied current exerting a composite force on them.…”

Section: Introductionmentioning

confidence: 99%

Macroscopic Characterization of Mechanical Properties in Electric Current Treated Dry Drawn High Strength Wires

Omoigiade

Haldar²,

Qin

2017

MRS Advances

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The present paper investigates the use of electric current treatment in improving the drawability of plain carbon steel wire for high strength steel applications. The mechanical properties for wires of composition 0.80C 0.65Mn 0.27Si wt.% of diameters 4.09 and 3.00 mm dry drawn from 10.00 mm rods are characterised. The total number of passes for 4.09 and 3.00 mm diameter wires are 7 and 10 respectively resulting in true strains of 1.79 and 2.41. Samples are treated with electric currents in-between the two drawing stages of 4.09 and 3.00 mm, and tested at both stages in tension, torsion and reverse bending along with control samples for comparison. The applied currents are pulsed at a frequency of 100 Hz with each pulse being approximated by a square wave of loading width 80µs and modest current densities of 7.96 Amm −2 . Thus the influence of electric current on the drawability of plain carbon steel wire is assessed between stages of reduction.

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Section: Introductionmentioning

confidence: 99%

Macroscopic Characterization of Mechanical Properties in Electric Current Treated Dry Drawn High Strength Wires

Omoigiade

Haldar²,

Qin

2017

MRS Advances

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“…This type of steel, characterized by good cold ductility, cold-work hardening, low strength and etc., is used in the automobile industry on a large scale. In order to reduce the vehicle weight and improve safety and crashworthiness qualities, the components made by the ultra high strength steel were developed [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on 22MnB5 Thinning Features in Hot Forming

Li¹,

Wang²,

Liu³

et al. 2017

dtetr

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Abstract. Thinning features of 22MnB5 in hot forming process were investigated by simulation of AUTO-FORM on the base of verification of the results in a published paper. The thinning of 22MnB5 in the isothermal forming process was calculated and the effect of temperature on cracking was evaluated. A mathematics model of forming limit, which is called FLE (Forming Limit Equation), is recommended to predict the cracking of the sheet in the hot forming process in stead of FLD (Forming Limit Diagram). And effect of other parameters, i.e. blank holding force, friction coefficient, thickness of sheet and strain rate, was also investigated.

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“…Geiger et al [3] measured basic characteristics in hot stamping of the boron steel sheet. Mori et al [4] prevented the springback in bending by heating ultra-high strength steel sheets. Bariani et al [5] examined the improvement of formability by hot stamping.…”

Section: Introductionmentioning

confidence: 99%

Hot semi-punching and cold scrap removing processes for hot stamping of ultra-high strength steel parts

2015

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-Hot semi-punching and cold scrap removing processes for hot stamping of ultra-high strength steel parts were developed to eliminate laser cutting having low productivity after hot stamping. A quenchable steel sheet is semi-punched without separation of punching scraps during hot stamping, and subsequently, the scraps are removed from the hot-stamped part at room temperature. For hot semi-punching, additional channels for taking the punching scraps out of dies are not required. Minimum remainder without separation of punching scraps and no clearance between the die and punch were optimal for the hot semi-punching process. The hot punching and cold removing loads of the quenched sheet were considerably smaller than the cold punching load, the quality of the hole edge was high and the delayed fracture around the sheared edge was prevented. Hot semi-punching and cold scrap removal were applied to a hot hat-shaped bending process.

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Warm and Hot Stamping of Ultra High Tensile Strength Steel Sheets Using Resistance Heating

Cited by 282 publications

References 9 publications

Macroscopic Characterization of Mechanical Properties in Electric Current Treated Dry Drawn High Strength Wires

Macroscopic Characterization of Mechanical Properties in Electric Current Treated Dry Drawn High Strength Wires

Numerical Investigation on 22MnB5 Thinning Features in Hot Forming

Hot semi-punching and cold scrap removing processes for hot stamping of ultra-high strength steel parts

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