Effective grain size of dual-phase steel

Kim, Nack J.; Nakagawa, Alvin H.

doi:10.1016/0025-5416(86)90181-3

Cited by 46 publications

(19 citation statements)

References 3 publications

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“…It is well known that the macroscopic mechanical behavior of DP steels depends on various factors, such as the grain size of the ferrite and the volume fraction, morphology, and carbon content of the martensite phase. [4][5][6][7][8][9][10][11] The fine grain size, high strength and volume fraction of the martensite phase generally increase the tensile strength of DP steels. On the other hand, a high volume fraction of the martensite phase reduces the ductility of DP steels.…”

Section: Introductionmentioning

confidence: 99%

Influence of Martensite Mechanical Properties on Failure Mode and Ductility of Dual-Phase Steels

Choi

Liu

et al. 2009

Metall Mater Trans A

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The effects of the mechanical properties of the martensite phase on the failure mode and ductility of dual-phase (DP) steels are investigated using a micromechanics-based finite element method. Actual microstructures of DP steels obtained from scanning electron microscopy (SEM) are used as representative volume elements (RVEs) in the finite element calculations. Ductile failure of the RVE is predicted as plastic strain localization during the deformation process. Systematic computations are conducted on the RVE to quantitatively evaluate the influence of the martensite mechanical properties and volume fraction on the macroscopic mechanical properties of DP steels. These properties include the ultimate tensile strength (UTS), ultimate ductility, and failure modes. The computational results show that, as the strength and volume fraction of the martensite phase increase, the UTS of DP steels increases, but the UTS strain and failure strain decrease. In addition, shear-dominant failure modes usually develop for DP steels with lower martensite strengths, whereas split failure modes typically develop for DP steels with higher martensite strengths. The methodology and data presented in this article can be used to tailor DP steel design for its intended purposes and desired properties.

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Section: Introductionmentioning

confidence: 99%

Influence of Martensite Mechanical Properties on Failure Mode and Ductility of Dual-Phase Steels

Choi

Liu

et al. 2009

Metall Mater Trans A

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“…[11][12][13][14][15] Under quasistatic loading, they are also characterized as having a continuous yielding during plastic deformation, whose strength increases with increasing martensite volume fraction, in accordance with a rule of mixtures like in composite materials. [12] These studies on dual-phase steels have been primarily concerned with phenomena occurring only under either static or quasistatic loading, but very few studies have been done on the their dynamic deformation and fracture behavior.…”

Section: Introductionmentioning

confidence: 99%

Effects of martensite morphology and tempering on dynamic deformation behavior of dual-phase steels

Lee

Hwang

Lee

et al. 2004

Metall Mater Trans A

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The effects of martensite morphology and tempering on the quasistatic and dynamic deformation behavior of dual-phase steels were investigated in this study. Dynamic torsional tests were conducted on six steel specimens, which had different martensite morphologies and tempering conditions, using a torsional Kolsky bar, and then the test data were compared via microstructures, tensile properties, and fracture mode. Bulky martensites were mixed with ferrites in the step-quenched (SQ) specimens, but small martensites were well distributed in the ferrite matrix in the intermediate-annealed (IA) specimens. Under a dynamic loading condition, the fracture mode of the SQ specimens was changed from cleavage to ductile fracture as the tempering temperature increased, whereas the IA specimens showed a ductile fracture mode, irrespective of tempering. These phenomena were analyzed in terms of a rule of mixtures applied to composites, microstructural variation, martensite softening and carbon diffusion due to tempering, and adiabatic shear-band formation.

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“…As shown in Fig. 12, graphs of UTS and UTS × UE vs. UE has been plotted to compare the DP steels developed in this study with the DP steels from literature 6,10,12,16,18,33) and commercial modern high strength automobile steel, DP980.…”

Section: )mentioning

confidence: 99%

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

2015

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Dual phase (DP) steels have been investigated using a new approach utilizing simple cold-rolling and subsequent intercritical annealing of a martensite-ferrite duplex starting structure. The ferrite grain size and volume fraction of martensite were varied by changing the rolling reduction and intercritical annealing time. Ultrafine grained DP (UFG-DP) steel with an average grain size of about 2 μm was achieved by short intercritical annealing of the 80% cold-rolled duplex microstructure. Tensile testing revealed superior mechanical properties (the ultimate tensile strength of 1 100 MPa and elongation of 13%) for the new DP steel in comparison with the commercially used high strength DP980 steel. The variations in hardness, strength and elongation of the specimens with rolling reduction and intercritical holding time were correlated to microstructural characterizations. The inherent mechanism for strengthening of the DP steel was discussed and the contribution of each strengthening factor was quantitatively calculated. The results showed that the calculated yield strength (430.6 MPa) is very close to the measured value (422 MPa).

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Effective grain size of dual-phase steel

Cited by 46 publications

References 3 publications

Influence of Martensite Mechanical Properties on Failure Mode and Ductility of Dual-Phase Steels

Influence of Martensite Mechanical Properties on Failure Mode and Ductility of Dual-Phase Steels

Effects of martensite morphology and tempering on dynamic deformation behavior of dual-phase steels

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

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