A Neoteric Hot-Stamped Steel with Unexceptionable Mechanical Properties and Ulra-Thin Oxide Layer

Zhao, Yan; Yang, Dengcui; Zhou, Feichi; Liu, Lei; Wang, Pengcheng; Gao, Pengfei; Zhao, Zhengzhi

doi:10.2139/ssrn.4257978

Cited by 2 publications

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“…[2] Hot-stamped steel is widely used owing to its combination of high strength and adequate ductility with a fully martensitic microstructure. [3] Recently, Taylor et al [4] designed a hot stamping steel with the ultimate tensile strength (UTS) was 2001 MPa and total elongation (TE) was 5.8%. Chang et al [5] produced a hot-stamped steel with UTS of 2046 MPa and TE of 6.8%.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Yield Strength and Total Elongation of an Ultrahigh Strength Hot‐Stamped Steel via Tempering Treatment

Chen,

Zhang,

Tian

et al. 2024

steel research int.

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A 2460 MPa ultimate tensile strength (UTS) has been achieved in this experimental steel, which was processed by a conventional hot stamping process with water quenching to room temperature. Additionally, comparing the microstructure evolution and strengthening mechanism before and after tempering, the microstructure has changed from fresh martensite transformed into tempered martensite with acicular carbides, and the fracture mode has also changed from brittle fracture transformed into ductile fracture mainly. Meanwhile, the main strengthening mechanism has changed from dislocation strengthening to precipitation and dislocation strengthening. Overall, the tempering process reduces dislocation density and produces acicular carbides, which decrease UTS. However, the tempering process reduces the quenching residual stress and changes the morphology of twin martensite, resulting in an increase in ductility. Meanwhile, it enhances the effect of carbide pinning dislocations, significantly enhances precipitation strengthening, and improves yield strength.

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Section: Introductionmentioning

confidence: 99%

Enhanced Yield Strength and Total Elongation of an Ultrahigh Strength Hot‐Stamped Steel via Tempering Treatment

Chen,

Zhang,

Tian

et al. 2024

steel research int.

View full text Add to dashboard Cite

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“…In addition, oxidation resistance was an important material property for hot-stamped steels. [21][22][23][24][25] The commercial hot-stamped 22MnB5 steels can be divided into bare and Al-Si-coated steels. [23] For the bare steels, severe oxidation and decarbonization usually occur because the materials need to be heated to 900-950 °C during hot forming.…”

Section: Introductionmentioning

confidence: 99%

A Hot‐Stamped Medium‐Mn Steel with Superior Strength–Ductility–Bendability Combination and Thin Oxidation Layer

Wang,

Yan,

Chang

2024

steel research int.

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A hot‐stamped medium‐Mn steel containing 3.84 wt% Mn is designed for the manufacture of hot‐stamped automotive components. The effects of intercritical temperatures employed for hot forming on the microstructure, tensile properties, and three‐point bending behaviors are investigated. The result shows that the microstructure can be controlled by intercritical temperatures, leading to different phase fractions of martensite, retained austenite, and ferrite in the steels. Besides, the tensile strength increases with increasing intercritical temperature, while both the total elongation and the bending angle show reverse change trend, which are related to the various phase fractions and the different transformation‐induced plasticity effects during deformation. Importantly, the medium‐Mn steel subjected to heat treatment at 800 °C possesses tensile strength of 1535 MPa, total elongation of 13.8%, and bending angle of ≈56°. Therefore, its total elongation is significantly higher than hot‐stamped 22MnB5 steel under the same tensile strength grade, and the bending angle of the former is close to the latter. Moreover, the thickness of oxidation layer on the medium‐Mn steel is only ≈3.5 μm after heat treatment at 800 °C, much thinner than the ≈57 μm‐thick oxidation layer on the 22MnB5 steel after austenitizing at 930 °C.

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A Neoteric Hot-Stamped Steel with Unexceptionable Mechanical Properties and Ulra-Thin Oxide Layer

Cited by 2 publications

References 0 publications

Enhanced Yield Strength and Total Elongation of an Ultrahigh Strength Hot‐Stamped Steel via Tempering Treatment

Enhanced Yield Strength and Total Elongation of an Ultrahigh Strength Hot‐Stamped Steel via Tempering Treatment

A Hot‐Stamped Medium‐Mn Steel with Superior Strength–Ductility–Bendability Combination and Thin Oxidation Layer

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