The Effects of Modified Ausforming on Structure of Spring Steel

Sugimoto, Atsushi; Tanaka, Tatsuo; Ohki, T.; Wakikado, Yoshihiro

doi:10.5346/trbane.1989.38

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…The hardness for 𝜀̅ = 0.8 reaches 600 HV10, and it becomes constant above that. The obtained graph is almost similar to the results of modified ausforming by Sugimoto et al [41] and so the proposed local thickening technique is a similar process to modified ausforming. In modified ausforming, increasing dislocation density by plastic deformation refines the martensite block size.…”

Section: Increase In Hardness Around Cornerssupporting

confidence: 82%

Corner Strengthening by Local Thickening and Ausforming Using Planar Compression in Hot Stamping of Ultra-High Strength Steel Parts

Maeno

Mori

Homma

et al. 2021

Metals

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Hot-stamped products are widely used for the body-in-white of an automobile as they are lightweight and improve crashworthiness. A hot-stamping process using planar compression was developed to strengthen corners of ultra-high strength parts by local thickening and hardening. In this process, the corners are thickened by compressing the blank in the planar direction with the upper and lower dies while blocking the movement of both edges with stoppers in the latter stage of forming. Thickening of the corners largely heightens the strength of the formed parts. Not only the thickness but also the hardness of the corner was increased by large plastic deformation and die quenching. For a hot hat-shaped part, a 30% increase in thickness and a 530 HV20 hardness around the corners were attained. The bending rigidity and strength of the formed parts thickened by 30% in the corners increased by 25% and 20%, respectively. In addition, the improvements of the part shape accuracy and the sidewall quenchability were obtained.

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Section: Increase In Hardness Around Cornerssupporting

confidence: 82%

Corner Strengthening by Local Thickening and Ausforming Using Planar Compression in Hot Stamping of Ultra-High Strength Steel Parts

Maeno

Mori

Homma

et al. 2021

Metals

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“…Barani et al 15) , Sugimoto et al 16) and Ayada et al 17) reported that the adding V has a relatively strong inhibition effect on recrystallization. As mentioned above, the effect of V on inhibiting recrystallization is considerably weaker when low carbon steels are used.…”

Section: Introductionmentioning

confidence: 99%

Effects of Alloying Elements on Static Recrystallization Behavior of Work-Hardened Austenite of High Carbon Low Alloy Steel

et al. 2017

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Many studies have investigated the effect of alloying elements on the recrystallization behavior of work-hardened austenite. However, the recrystallization behavior of high carbon low alloy steel has not yet been systematically investigated. In this study, the effects of alloying elements (Al, Nb, V, Ti, and B) are examined by means of a double-hit compression test, transmission electron microscopy (TEM) observation and atom probe tomography (APT) analysis. The following conclusions were obtained:(1) When alloying elements are in solution, Nb and Ti have an equally strong effect on inhibiting recrystallization, followed by V.(2) When the deformation and holding temperature becomes low, the recrystallization is signi cantly inhibited by adding 0.1% V.(3) Fine particles were not observed by APT in the 0.1%V steel, which shows the strong inhibition effect on recrystallization. The solute V content measured by APT decreased as the holding time increased, and recrystallization commenced at the time when relatively coarse precipitates were formed.

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Effects of Alloying Elements on Static Recrystallization Behavior of Work Hardened Austenite of High Carbon Low Alloy Steel

Kubota

Kobayashi

Ushioda

et al. 2016

J. Japan Inst. Metals and Materials

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Many studies have investigated the effect of alloying elements on the recrystallization behavior of work hardened austenite. However, the recrystallization behavior of high carbon low alloy steel has not been systematically investigated yet. In this study, the effects of alloying elements (Al, Nb, V, Ti and B) are examined by means of double hit compression test, TEM and 3DAP (Three dimensional atom probe) analyses. The following conclusions were obtained:(1) When alloying elements are in solid solution, Nb and Ti has equally strong effects on inhibiting recrystallization, followed by V.(2) When deformation and holding temperature becomes low, the recrystallization is remarkably inhibited by adding 0.1V. (3) Fine particles were not observed by 3DAP observation in the 0.1V steel which shows the strong inhibition effect on recrystallization. The solute V content measured by 3DAP decreased as the holding time increased and, recrystallization commenced at the time when relatively coarse precipitates formed.

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The Effects of Modified Ausforming on Structure of Spring Steel

Cited by 4 publications

References 2 publications

Corner Strengthening by Local Thickening and Ausforming Using Planar Compression in Hot Stamping of Ultra-High Strength Steel Parts

Corner Strengthening by Local Thickening and Ausforming Using Planar Compression in Hot Stamping of Ultra-High Strength Steel Parts

Effects of Alloying Elements on Static Recrystallization Behavior of Work-Hardened Austenite of High Carbon Low Alloy Steel

Effects of Alloying Elements on Static Recrystallization Behavior of Work Hardened Austenite of High Carbon Low Alloy Steel

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