Investigation of the critical factors controlling sheared edge stretching of ultra-high strength dual-phase steels

Wu, Yingjie; Uusitalo, Juha; DeArdo, A. J.

doi:10.1016/j.msea.2021.142070

Cited by 14 publications

(6 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They have found that DP microstructure with a lower hardness difference in between the constituent phases has resulted in considerably higher HER values as compared to DP steels with high hardness difference between the phases. Similarly, Wu et al [22], Hasegawa et al [23] and Hu et al [24], have also shown in their study that decreasing of hardness difference between the ferrite and martensite phases in DP steels results in higher HER values.…”

Section: Introductionmentioning

confidence: 57%

“…result in considerably different HER values for the same material [9][10][11][12]. In terms of shearing, cutting clearance play a major role in determining the HER values since it directly impacts the four important zones on the sheared edge of the sheet, namely, rollover, burnish, fracture and burr zones [13][14][15][16][17][18]. Especially, the ratio of burnished zone over the fracture zone on the sheared edge is one of the controlling factors of the sheared edge ductility of materials.…”

Section: Introductionmentioning

confidence: 99%

“…Especially, the ratio of burnished zone over the fracture zone on the sheared edge is one of the controlling factors of the sheared edge ductility of materials. Since most of the micro-voids generated by the punching process are located at the fracture zone, the increase of the ratio of burnished zone over the fracture zone significantly improves the edge stretching ability of sheet metals [17]. These initial micro-voids or cracks propagates through the material during deformation and leads to final through-thickness crack formation.…”

Section: Introductionmentioning

confidence: 99%

“…In order to improve the edge-stretching capability of DP steels many researches have been conducted to obtain a more homogenous microstructure. Wu et al [17], have developed series of different DP steels by different processing routes and investigated their microstructures, tensile properties and hole expansion behaviours. They have found that DP microstructure with a lower hardness difference in between the constituent phases has resulted in considerably higher HER values as compared to DP steels with high hardness difference between the phases.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Different Conical Punch Angle Geometries and the Initial Hole Diameters on the Hole Expansion Ratio of DP steels

Şen

Civek

BEKTAŞ

2022

International Journal of Automotive Science and Technology

View full text Add to dashboard Cite

In the recent decade, advanced high strength steels (AHSS) have gained a great popularity in the automotive manufacturing industries due to their high strength to weight ratio, which significantly improves the safety of the manufactured automobiles while reducing the weight and thus, enabling to improve the fuel efficiency. However, it is known that some types of AHSSs, especially DP steels, are highly susceptible to edge cracking behaviour during the forming operations. Edge cracking behaviour is generally investigated with a 600 conical punch as suggested by the ISO 16630 standard. However, in this study, to observe the behaviour of edge cracking ability of DP steels under different conical punch angles for different initial hole diameters, hole expansion tests have been performed with conical punches with three different angles (300 ,600, 900) for three different initial hole diameters (14, 16, 18 mm). The results have shown that the hole expansion ratio (HER) does not differ considerably with the variation of the conical punch angle and the initial hole diameter due to low fracture strain of DP steels observed after hole expansion tests. The major factor for the edge stretching ability of DP steels have been observed to be microstructure rather than geometrical factors such as conical punch angles.

show abstract

Section: Introductionmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Different Conical Punch Angle Geometries and the Initial Hole Diameters on the Hole Expansion Ratio of DP steels

Şen

Civek

BEKTAŞ

2022

International Journal of Automotive Science and Technology

View full text Add to dashboard Cite

show abstract

“…As it known, inclusions can easily cause such problems in steel because of different deformability, hardness, thermal expansion and so on. [21][22][23][24][25] Moreover, it is accepted that inclusions smaller than 10 μm seldom cause problems in steel. As a result, it was inferred that these scattered Al 2 O 3 particles probably originated from a crushed Al 2 O 3 cluster.…”

Section: Analysis On the Occurrences Of Sand-holes In Cold-drawn Batt...mentioning

confidence: 99%

Optimal Control of Inclusions to Prevent “Sand-Hole” Surface Defects in Deep Cold-Drawn Battery Cups for Electrical Vehicles

et al. 2023

View full text Add to dashboard Cite

The present work was conducted to elucidate the influence of inclusionson surface quality of deep cold-drawn battery cups for electrical cars. The obtained results revealed that, to prevent the surface defects of sand-holes in battery cups in deep cold-drawing process, attentions should be paid to steelmaking and casting process for optimal control of inclusions. Because sand-holes were often caused by large Al 2 O 3 clusters and CaO-Al 2 O 3 particles. Most important, a worthy finding was that these inclusions were not safe when they were over 100 μm and bigger than 27 μm, respectively, which was important for process optimization. By reducing (FeO) contents in ladle slag and tundish covering flux to about 5% or lower, together with optimal fluid flow of molten steel in tundish, such large inclusions can be well decreased to prevent the occurrences of sand-holes in battery cups in industrial production.

show abstract

Hydrogen Embrittlement of a Prerolled High‐Mn Steel with Different Cut‐Edge Characteristics

Sheng,

Zheng,

Wang

et al. 2024

steel research int.

View full text Add to dashboard Cite

The hydrogen embrittlement behavior of a prerolled Fe–15Mn–0.65C–2Al–2Si high‐Mn steel with various cut‐edge properties is studied via hydrogen precharging and slow strain rate test. In the presence of hydrogen, samples prepared by laser cutting under atmosphere of N2 exhibit the best total elongation at about 39%. Press blanking produces severe shear deformation, tensile residual stresses, and strain‐induced martensite, resulting in a high risk to hydrogen‐induced cracking. With compressive residual stresses produced from waterjet, corresponding samples exhibit the lowest elongation loss against hydrogen. Despite hydrogen charging, the fracture surfaces show transgranular quasi‐cleavage features, for which mechanical twinning from prerolling plays a critical role. The hydrogen‐enhanced decohesion mechanism accounts for cleavage fracture since hydrogen segregation reduces cohesive stress at twin boundaries.

show abstract

Investigation of the critical factors controlling sheared edge stretching of ultra-high strength dual-phase steels

Cited by 14 publications

References 41 publications

Effect of Different Conical Punch Angle Geometries and the Initial Hole Diameters on the Hole Expansion Ratio of DP steels

Effect of Different Conical Punch Angle Geometries and the Initial Hole Diameters on the Hole Expansion Ratio of DP steels

Optimal Control of Inclusions to Prevent “Sand-Hole” Surface Defects in Deep Cold-Drawn Battery Cups for Electrical Vehicles

Hydrogen Embrittlement of a Prerolled High‐Mn Steel with Different Cut‐Edge Characteristics

Contact Info

Product

Resources

About