Effect of the martensite distribution on the strain hardening and ductile fracture behaviors in dual-phase steel

Park, Kyo-Sun; Nishiyama, Masato; Nakada, Nobuo; Tsuchiyama, Toshihiro; Takaki, Setsuo

doi:10.1016/j.msea.2014.02.058

Cited by 259 publications

(95 citation statements)

References 18 publications

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“…Typical round-house engineering stress-strain curves inherent in DP steels [10,26] were also observed in our steel for all four heat treatment conditions (Fig. 14a).…”

Section: Mechanical Propertiessupporting

confidence: 60%

“…18 compares the mechanical properties of the present samples with DP steels that have been conventionally processed. It can be seen that the UTS and YS of the studied DP steel are lower than those of hot rolled ones, while the total elongation is relatively higher [2,10,13,27,[33][34][35][36][37][38][39]. The product of UTS × total elongation is relatively lower than that of hot rolled ones, which suggests a lower toughness in the studied steel compared to the reference steels.…”

Section: 2mentioning

confidence: 98%

“…With increasing the martensite fraction, the yield strength and ultimate tensile strength increase while uniform and total elongations decrease [8,9]. The distribution of martensite also affects the mechanical behaviour [10][11][12]. Martensite regions existing as isolated areas within ferrite matrix result in a better combination of strength and ductility than martensite regions forming a chain-like network structure surrounding ferrite [10].…”

Section: Introductionmentioning

confidence: 99%

“…The distribution of martensite also affects the mechanical behaviour [10][11][12]. Martensite regions existing as isolated areas within ferrite matrix result in a better combination of strength and ductility than martensite regions forming a chain-like network structure surrounding ferrite [10]. Refinement of ferrite or/and martensite regions simultaneously enhances strength and ductility [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

et al. 2015

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Conventional dual phase (DP) steel (0.08C-0.81Si-1.47Mn-0.03Al wt.%) was manufactured using simulated strip casting schedule in laboratory. The average grain size of prior austenite was 117. ±. 44. μm. The continuous cooling transformation diagram was obtained. The microstructures having polygonal ferrite in the range of 40-90%, martensite with small amount of bainite and Widmanstätten ferrite were observed, leading to an ultimate tensile strength in the range of 461-623. MPa and a corresponding total elongation in the range of 0.31-0.10. All samples exhibited three strain hardening stages. The predominant fracture mode of the studied steel was ductile, with the presence of some isolated cleavage facets, the number of which increased with an increase in martensite fraction. Compared to those of hot rolled DP steels, yield strength and ultimate tensile strength are lower due to large ferrite grain size, coarse martensite area and Widmanstätten ferrite. Abstract: Conventional dual phase (DP) steel (0.08C-0.81Si-1.47Mn-0.03Al wt. %) was manufactured using simulated strip casting schedule in laboratory. The average grain size of prior austenite was 117±44 μm. The continuous cooling transformation diagram was obtained. The microstructures having polygonal ferrite in the range of 40-90 %, martensite with small amount of bainite and Widmanstätten ferrite were observed, leading to an ultimate tensile strength in the range of 461 -623 MPa and a corresponding total elongation in the range of 0.31 -0.10. All samples exhibited three strain hardening stages. The predominant fracture mode of the studied steel was ductile, with the presence of some isolated cleavage facets, the number of which increased with an increase in martensite fraction. Compared to those of hot rolled DP steels, yield strength and ultimate tensile strength are lower due to large ferrite grain size, coarse martensite area and Widmanstätten ferrite. Disciplines Engineering | Science and Technology Studies

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“…Typical round-house engineering stress-strain curves inherent in DP steels [10,26] were also observed in our steel for all four heat treatment conditions (Fig. 14a).…”

Section: Mechanical Propertiessupporting

confidence: 60%

Section: 2mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

et al. 2015

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“…8,[12][13][14] However, most of these works were carried out under limited experimental conditions such as a quasi-static tensile strain rate at room temperature. For further industrial application of the method, damage quantification must be performed at various conditions such as high deformation speed, cryogenic temperature etc.…”

Section: Optical Microscopy-based Damage Quantification: An Example Omentioning

confidence: 99%

Optical Microscopy-Based Damage Quantification: an Example of Cryogenic Deformation of a Dual-Phase Steel

Uehata

Koyama

Takagi³

et al. 2018

ISIJ Int.

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Quantitative analysis of martensite and bainite microstructures using electron backscatter diffraction

Wang

Hua

Kong

et al. 2016

Microsc. Res. Tech.

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In the present work, ultra-high-strength steels with multiphase microstructures containing martensite and bainite were prepared by controlling the cooling rate. A new approach was proposed for quantitatively statistical phase analysis using electron backscatter diffraction (EBSD) based on the band contrast which correlates to the quality and intensity of the diffraction patterns. This approach takes advantage of the inherently greater lattice imperfections of martensite, such as dislocations and low-angle grain boundaries, relative to that of bainite. These can reduce the intensity and quality of the EBSD patterns of martensite, which decrease the band contrast. Thus, combined with morphological observations, Gaussian two-peak fitting was employed to analyze the band contrast profile and confirm the ranges of band contrast for the two phases. The volume fractions of bainite and martensite in different samples were determined successfully. In addition, the results show that increased cooling rates improve the proportion of martensite and the ratio of martensite to bainite. Microsc. Res. Tech. 79:814-819, 2016. © 2016 Wiley Periodicals, Inc.

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Effect of the martensite distribution on the strain hardening and ductile fracture behaviors in dual-phase steel

Cited by 259 publications

References 18 publications

Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

Optical Microscopy-Based Damage Quantification: an Example of Cryogenic Deformation of a Dual-Phase Steel

Quantitative analysis of martensite and bainite microstructures using electron backscatter diffraction

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