Influence of stress on martensitic transformation and mechanical properties of hot stamped AHSS parts

Chang, Ying; Li, X.D.; Zhao, Kunmin; Wang, C.Y.; Zheng, Guojun; Hu, Ping; Han, Dong

doi:10.1016/j.msea.2015.01.056

Cited by 22 publications

(4 citation statements)

References 25 publications

(25 reference statements)

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“…Modeling the process from austenitization to finished product relies on in depth knowledge of parameters influencing the microstructural composition and the mechanical properties of the finished product. Besides the cooling rate the importance of considering hot plastic deformation in isothermal and non-isothermal forming operations are pointed out [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Golling

Östlund

Oldenburg

2016

Materials Science and Engineering: A

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Developments of the hot stamping technology have enabled the production of components with differential microstructure composition and mechanical properties. These can increase the performance of certain crash-relevant automotive structures by combining high intrusion protection and energy absorption. This paper presents a comprehensive experimental investigation on the flow and ductile fracture properties of boron-alloyed steel with a wide range of different microstructure compositions. Three types of dual phase microstructures at three different volume fractions, and one triple phase grade, were generated by thermal treatment. Flow curves extending beyond necking and the equivalent plastic strain to fracture for each grade was determined by tensile testing using fullfield measurements. The influence of phase composition and microstructural parameters were further investigated by means of a multi-scale modeling approach based on mean-field homogenization in combination with local fracture criteria. Inter-phase and intra-phase fracture mechanisms were considered by adopting two separate fracture criteria formulated in terms of the local average stress field. The micromechanical model captures with useful accuracy the strong influence of microstructure and processing conditions on the flow and fracture properties, implying promising prospects of mean-field homogenization for the constitutive modeling of hot stamped components.

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Section: Introductionmentioning

confidence: 99%

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Golling

Östlund

Oldenburg

2016

Materials Science and Engineering: A

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“…Even some authors have shown that type of deformation i.e. tensile, compression, torsion or hydrostatic [5,9], amount of strain [21], strain rate [25] and prior austenite grain size ( [18,15]) have a significant effect on thermo-mechanical processes. For example, Min et al [20] investigated the effect of the thermomechanical process on the microstructure and secondary-deformation behavior of 22MnB5 steels and it was concluded that as the steel was deformed at 650°C, deformation induced ferrite transformation occurred even when a small strain of 0.044 was applied, and the volume fraction of deformation induced ferrite increases with increasing applied strain level.…”

Section: Introductionmentioning

confidence: 99%

Phase transformations in a simulated hot stamping process of the boron bearing steel

et al. 2015

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“…Generally, the hot stamping steel sheets should be heated in a furnace above the austenitization temperature, then transferred to a stamping die and quenched to achieve excellent mechanical properties [1]. However, oxidation and decarburization occur on the surface of the hot stamping steel sheets during the hot stamping process [4,5].…”

Section: Introductionmentioning

confidence: 99%

Constitutive modeling for elevated temperature flow behavior of a novel Cr-Si alloyed hot stamping steel

Zhu

Yang

et al. 2023

Mater. Res. Express

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The flow behavior of a novel Cr-Si alloyed hot stamping steel (Cr-Si steel) at elevated temperature was investigated via isothermal compression tests on a Gleeble-3500 thermomechanical simulator with a temperature range of 600 ~ 900 ℃ and a strain rate range of 0.1~10 s-1. Subsequently, the Arrhenius-type constitutive model, comprising strain compensation, was established in accordance with the friction and adiabatic heating corrected stress-strain curves. Furthermore, the predictability and prediction accuracy of the constitutive model were verified. The results reveal that at a constant strain rate, the flow stress of the Cr-Si steel initially increases as the strain increases before tending to stabilize, owning to the combined effects of work hardening and dynamic recovery. The peak flow stresses decrease as the temperatures increase and the strain rates decrease. The constitutive model can accurately predict the elevated temperature constitutive relationship of the Cr-Si steel during the hot stamping process.

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Influence of stress on martensitic transformation and mechanical properties of hot stamped AHSS parts

Cited by 22 publications

References 25 publications

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Phase transformations in a simulated hot stamping process of the boron bearing steel

Constitutive modeling for elevated temperature flow behavior of a novel Cr-Si alloyed hot stamping steel

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