A Comparison between an Advanced High-Strength Steel and a High-Strength Steel Due to the Spring back Effect

Silva, Érika Aparecida da; Fernandes, Luiz Fernando Vargas Malerba; Silva, José Wilson de Jesus; Ribeiro, Rosinei Batista; Pereira, Marcelo dos Santos; Alexis, Joël

doi:10.9790/1684-1305012127

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…In bending process, the main encountered problem is spring-back behavior of formed material [24]. Spring-back problem is about the elastically recover of the material [25]. Inconel 625 is one of the materials used in many engineering fields due to high strength and high corrosion resistance in marine mediums.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of formability of inconel sheet plate for different die angles and rolling directions in press brake bending

HAYRAT

Kosa

DURMUŞOĞLU

2023

European Mechanical Science

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The formability of Inconel materials is important to be used in engineering applications such as in fields of aircraft and maritime. The aim of study is to investigate bending characteristic and formability of Inconel 625 material having a property of corrosion resistance and high strength. In the paper, spring-back phenomena of Inconel 625 sheets are focused on experimentally. The 4 specimens for each different die angle are prepared to be bent. The press brake is used for forming Inconel 625 sheets. The die angle is altered from 90˚ to 150˚. The different rolling direction such as 0˚ and 90˚ is chosen to investigate the effect of grain orientation on spring-back of Inconel sheets. The bending radius is constant and set as 2 mm for all bending tests. The spring-back angles and amounts are measured. Results show that as the bending angle is increased, the spring-back amount in units of angle is decreased averagely from 3.35˚ to 2.58˚ for 0˚ rolling direction and maximum spring-back angle is obtained at a die angle of 120˚ for rolling direction of 90˚. Finally, Erichsen cupping test is also applied to determine the deformability of Inconel sheets. It is demonstrated that cup height value has been found as 17.20 mm.

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Section: Introductionmentioning

confidence: 99%

An experimental investigation of formability of inconel sheet plate for different die angles and rolling directions in press brake bending

HAYRAT

Kosa

DURMUŞOĞLU

2023

European Mechanical Science

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“…Firstly, it is assumed that even for mild steel grades an influence of the gradation of material properties on the forming behavior, like for example on the springback, is evident. Thus, if these effects are apparent in low alloyed steels, an even higher impact of inhomogeneous properties is presumably present for the HSS 18 and AHSS 19 grades because of their more pronounced springback behavior. It has already been shown in literature that the springback angle is directly related to the materials strength.…”

Section: Introductionmentioning

confidence: 99%

Improvement of process control in sheet metal forming by considering the gradual properties of the initial sheet metal

Zettl

Schmid

Pulvermacher

et al. 2023

The Journal of Strain Analysis for Engineering Design

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In scientific studies, sheet metal is usually considered as a two-dimensional body. Thus, it is accepted that material properties are in most cases regarded homogeneous in thickness direction. However, a gradation of certain properties becomes apparent when going beyond the standard characterization methods for sheet metals, which can for example, influence the springback behavior and the thinning of the sheet after forming. Thus, the aim of this work is to further improve the prediction accuracy of springback after forming in simulations, by implementing several inhomogeneous properties over the sheet thickness in an existing material model. For this purpose, the entire procedure from the identification of the inhomogeneous properties for describing the gradation to the implementation in a numerical model and its validation by comparing experimental and simulated bending operations is carried out on a DC04 cold-forming steel in order to prove its influence on the springback behavior. It is shown that including graded material properties in simulations does indeed have an impact on the prediction quality of springback and that the information about inhomogeneous properties can be provided by existing characterization methods with a high local resolution like electron backscatter diffraction or X-ray stress analysis. In a further step, it was possible to validate the improvement in numerical accuracy by comparing the prediction of the springback angle from both the existing and the extended model with experimental bending results. Both the initial model as well as the model supplemented with the 3D properties provide a good prediction accuracy in the solution heat treated material state. For the predeformed material, however, the initial numerical model predicts a springback angle of about 13°, which deviates remarkably from the experimentally obtained mean value of about 17°. The extended model delivers a significantly improved accuracy in springback prediction in relation to the initial prediction (deviation of 4°) with a minor deviation of only about 0.8°, which proves the importance of considering the gradation of material properties in thickness direction for an overall higher dimensional accuracy of sheet metal products.

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“…TRIP-assisted (TRIP-aided) steels belong to the first generation of advanced high-strength steels (AHSSs) intended for applications in automotive, construction, infrastructure industries, performing an ultimate strength higher than 550 MPa [1,2]. An improved steel strength (tensile strength of 600-1100 MPa [3]) allows reducing construction weight which is of great cost-saving and environmentalfriendly importance [3,4].…”

Section: Introductionmentioning

confidence: 99%

Comparative study on the effect of (Cr, Mo, V)-alloying on transformation and mechanical behavior of 0.2 wt.% C TRIP-assisted steel

Kussa¹,

Zurnadzhy²,

Dabalà³

et al. 2022

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The structure and mechanical properties of two 0.2 wt.% C TRIP-assisted steels (Transformation Induced Plasticity) were compared to evaluate the effect of additional (Cr, Mo, V)-alloying on transformation kinetic and tensile/impact behavior after isothermal bainite transformation (bainitizing) and Q&P (Quenching-and-Partitioning) treatment. The work was performed using SEM, XRD, tensile/impact testing, and computer simulation. It was found that adding 0.55 wt.% Cr, 0.2 wt.% Mo, and 0.11 wt.% V into Mn-Si-Nb steel increased the incubation time in pearlite and bainite temperature ranges by 5.6 and 4.4 times, respectively. More heavily alloyed steel performed an improved combination "Strength/Ductility/Impact Toughness": its maximum PSE (Product of Strength and Elongation) value of 24 GPa• % referred to bainitizing treatment, whereas the highest KCV 20 • C values (220-225 J cm −2 ) corresponded to Q&P treatment. Improved mechanical properties of (Cr, Mo, V)-alloyed steel were attributed to a higher amount of retained austenite and a slower rate of TRIP-effect.

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A Comparison between an Advanced High-Strength Steel and a High-Strength Steel Due to the Spring back Effect

Cited by 8 publications

References 7 publications

An experimental investigation of formability of inconel sheet plate for different die angles and rolling directions in press brake bending

An experimental investigation of formability of inconel sheet plate for different die angles and rolling directions in press brake bending

Improvement of process control in sheet metal forming by considering the gradual properties of the initial sheet metal

Comparative study on the effect of (Cr, Mo, V)-alloying on transformation and mechanical behavior of 0.2 wt.% C TRIP-assisted steel

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