Hole expansion ratio in intercritically annealed QP 980/1180 steel grades as a function of testing condition

Madrid, M Martinez; Tyne, C. J. Van; Sriram, S.; Pavlina, Erik J.; Hu, Jie; Clarke, Kester D.

doi:10.1088/1757-899x/418/1/012083

Cited by 7 publications

(5 citation statements)

References 23 publications

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“…The edge effect therefore must be taken into consideration for edge formability. Madrid et al [20] reported QP1000 is not sensitive to the punch geometry. Goshert et al [21] studied four edge conditions with angular stretch bend tests for QP980 and DP600, which emphasized the influence of edge effects.…”

Section: Introductionmentioning

confidence: 98%

Edge fracture of the first and third-generation high-strength steels: DP1000 and QP1000

Chang

Rong

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Advanced high-strength steels (AHSS) have shown profound progress in improving tensile ductility or global formality in the last decades over three generations. For a complete assessment of both the global and local formability, this study aims to characterize and compare the tensile and edge fracture behavior of the first and third-generation AHSS (dual-phase steel and quenching & partitioning steel) with the same nominal strength level of 980 MPa. Uniaxial tensile tests are performed to characterize the tensile properties. Hole expansion tests are conducted with two edge conditions based on separated preparation techniques (waterjet with polishing and punching) to investigate the edge fracture for both materials. The hole expansion ratios and edge fractures are compared between two materials and two edge conditions. It is concluded that the investigated QP1000 has promoted global formability while the DP1000 shows better local formability due to its damage-tolerant and crack-resistant responses.

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Section: Introductionmentioning

confidence: 98%

Edge fracture of the first and third-generation high-strength steels: DP1000 and QP1000

Chang

Rong

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…[16][17][18][19][20] For example, some tailored compositions for QP treatments (QP980, QP1180) show Mn and Si amounts which are rarely produced in the industry as commercial grades. [21,22] As a consequence, new interest is focused on the application of QP on commercial alloys, which are featured by a composition which has not been designed precisely for this treatment, but are already used in the industry: the effective application of such a treatment can be proposed as a new path to obtain high mechanical properties with enhanced ductility with respect to QT. Some QP treatments have been performed on 22MnB5 boron steel for hot stamping, both in the standard version [23,24] and in a high-Si one, [25] showing the possibility to exploit this treatment on this class of materials with interesting results: in particular, the former two have produced UTS values of 1400-1700 Mpa, coupled with A% in the range of 10-13%.…”

Section: Introductionmentioning

confidence: 99%

“…[ 16–20 ] For example, some tailored compositions for QP treatments (QP980, QP1180) show Mn and Si amounts which are rarely produced in the industry as commercial grades. [ 21,22 ]…”

Section: Introductionmentioning

confidence: 99%

Influence of Quenching and Partitioning on the Mechanical Properties of Low‐Silicon 33MnCrB5 Boron Steel

Barella,

Belfi,

Gruttadauria

et al. 2023

steel research int.

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Quenching and partitioning (QP) is a heat treatment that is designed to enhance both the mechanical properties and ductility of low‐ and medium‐carbon steels. This treatment is performed on steels with a tailored chemical composition. Herein, QP treatments are designed and performed on commercial low‐silicon 33MnCrB5 boron steel. Different temperatures (evaluated using thermodynamic simulations) and times are tested. Scanning electron microscopy investigations are conducted to observe the microstructure, whereas X‐ray diffraction and electron backscattered diffraction analyses are performed to assess the presence and amount of retained austenite (RA). Tensile tests are performed to investigate the mechanical properties. The designed treatments introduce a fraction of up to 4.6% of RA in the final microstructure. Tensile tests show that the QP samples are characterized by high ultimate tensile strength (1633–1756 MPa) with an increased elongation at break with respect to the reference quenching and tempering condition (16–18% versus 9%). Hardening coefficients are linked to martensite tempering in the initial stages of plastic deformation, whereas at higher strains, they are mostly influenced by RA presence. The proposed treatments are successfully performed on 33MnCrB5 grade, leading to a set of tensile properties that are not exploitable with traditional treatments.

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“…It has been reported that reducing the dif-ference in hardness [8] or strength [9] between the two phases improves ductility at edges [10]. Moreover, a homogeneous microstructure [11] with a low volume fraction of martensite [4] or lower martensite carbon content [12] leads to better edge performance during forming. Finally, high resistance to edge cracking can be achieved by ferritic-bainitic DP steels or complex phase (CP) steels [13].…”

Section: Introductionmentioning

confidence: 99%

Initiation and growth of edge cracks after shear cutting of dual-phase steel

Khalilabad

Perdahcioglu

Atzema

et al. 2023

Int J Adv Manuf Technol

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Dual-phase steels suffer from low edge ductility, which limits their formability. In this study, an in-plane bending test is used to investigate the initiation and evolution of edge cracks. The edges of samples were prepared by shear cutting and afterwards further deformed by the in-plane bending test. Void distribution and non-uniform plastic deformation were explored with the help of scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) analysis and microhardness measurement in different regions of the material edge. The extent of micro-cracks was revealed by microcomputed tomography (µCT) scan. The result shows that the blanking process creates inhomogeneous void distribution in the thickness direction. As the deformation increases during the subsequent in-plane bending test, the micro-cracks initiate at the burr region and grow towards the rollover region. Once they entirely pass the thickness of the material, they grow further, away from the edge. High roughness, plastic deformation, and void volume fraction were observed at the burr region, triggering crack initiation. The in-plane bending test successfully distinguished the dominant mechanism behind edge cracking.

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Hole expansion ratio in intercritically annealed QP 980/1180 steel grades as a function of testing condition

Cited by 7 publications

References 23 publications

Edge fracture of the first and third-generation high-strength steels: DP1000 and QP1000

Edge fracture of the first and third-generation high-strength steels: DP1000 and QP1000

Influence of Quenching and Partitioning on the Mechanical Properties of Low‐Silicon 33MnCrB5 Boron Steel

Initiation and growth of edge cracks after shear cutting of dual-phase steel

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