Dual-phase hetero-structured strategy to improve ductility of a low carbon martensitic steel

Huang, Jin; Liu, Y.; Xu, Tao; Chen, X.F.; Lai, Qingquan; Xiao, Lirong; Pan, Zhiyi; Gao, Bo; Zhou, Hao; Zhu, Yuntian

doi:10.1016/j.msea.2021.142584

Cited by 56 publications

(12 citation statements)

References 64 publications

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“…In the microstructures of cold‐rolled steel, the martensite stretched along the direction of rolling which is in good agreement with the previous studies. [ 21–23 ]…”

Section: Resultsmentioning

confidence: 99%

Effect of Intercritical Annealing Time on the Microstructure and Mechanical Properties of Dual‐Phase Steel Processed by Large‐Strain Asymmetric Cold‐Rolling

Khorasani

Jamaati

Aval

2023

steel research int.

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Herein, the effect of intercritical annealing time on the microstructure and mechanical properties of dual‐phase steel processed by large‐strain asymmetric cold‐rolling is studied. It is observed that the martensite islands are uniformly distributed in the ferrite phase in the microstructures of dual‐phase steels due to performing the asymmetric cold‐rolling before intercritical annealing treatment. As the intercritical annealing time increases up to 10 min, the fraction of martensite increases. By increasing the holding time and fraction of martensite, the carbon content of the martensite phase is decreased. The short‐term intercritical annealing eliminates the yield point phenomenon. However, intercritical annealing at 860 °C for 20 min leads to the reoccurrence of a yield point phenomenon. Increasing the intercritical annealing time to 10 min improves the yield strength to 505 MPa and ultimate tensile strength to 834 MPa. However, the strength decreases sharply after the holding time of 20 min. There is a perfect linear relationship between the mechanical properties and the fraction of martensite. Ductile failure is observed at the center of the fracture surfaces of dual‐phase steels while shear failure occurs at the edges of the fracture surfaces.

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“…In the microstructures of cold‐rolled steel, the martensite stretched along the direction of rolling which is in good agreement with the previous studies. [ 21–23 ]…”

Section: Resultsmentioning

confidence: 99%

Effect of Intercritical Annealing Time on the Microstructure and Mechanical Properties of Dual‐Phase Steel Processed by Large‐Strain Asymmetric Cold‐Rolling

Khorasani

Jamaati

Aval

2023

steel research int.

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“…Generally speaking, those with an orientation angle between 2 °and 15 °are small-angle grain boundaries, and those with an orientation angle above 15 °are high-angle grain boundaries. Te large-angle grain boundary can hinder the movement of dislocations during the deformation process, which helps to improve the strength of the steel [13], and a large proportion of the large-angle grain boundary determines the crack propagation work and can improve the impact toughness [17]. By comparison, the ratio of high-angle grain boundaries of steel B is 62.2%, which is higher than that of steel A (49.3%).…”

Section: Methodsmentioning

confidence: 96%

“…At present, NKK of Japan, POSCO of South Korea, TyssenKrupp of Germany, and SSAB of Sweden are in the forefront of FB steel research in the world and have successfully developed DP600, DP780, and higher-gradehotrolleddual-phase steels [9,10]. Besides, Gao et al developed a the strength-ductility synergy of dual-phase (DP) steels that was obtained by properly tailoring the structural heterogeneity, including the distribution and fraction of constituent phases [11][12][13][14]. Due to the lower yield strength, good performance stability, and uniformity of DP780 steel, it has broad market application prospects.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Work Hardening Behavior of Hot-Rolled DP780 Ferrite/Bainite Dual-Phase Steel

Wan³

2023

Advances in Materials Science and Engineering

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In this article, by optimizing the alloy composition, the DP780 grade hot-rolled duplex steel was obtained by TMCP (thermo-mechanical control process) combined with medium temperature coiling procedure. The microstructure evolution and mechanical properties of the experimental steel were analyzed by means of optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), room temperature tensile experiment, and low-temperature impact experiment. When the coiling temperature was 540°C, the yield strength, tensile strength, and elongation of the experimental steel were 663 MPa, 785 MPa, and 23%, respectively, and the product of the strength and elongation was as high as 18.1 GPa%, which accords with the mechanical properties of the national standard for DP780 dual-phase steel. The experimental steel exhibits significant work hardening effect at higher strain, and can still guarantee a certain work hardening index and good formability. When the coiling temperature was high (570°C), the strength of the experimental steel decreased and the work hardening effect was also weakened due to the coarsening of microstructure. The results of this article provide theoretical guidance for the production of DP780 dual-phase steel by hot rolling.

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“…Low carbon steels are one of the most widely used materials in various industries due to their low cost and good formability. The result is that interest in these steels as a target for a wide range of studies aimed at improving their mechanical properties has not yet disappeared [1]. Increasing the strength of materials by forming an ultrafine grain (UFG) structure, has created new prospects for increasing the strength of low carbon steels and thus expanding their extent of applications.…”

Section: Introductionmentioning

confidence: 99%

“…Using this method, the superior strength-ductility balance was obtained in comparison with the bimodal grain structures produced by the ferrite-martensite dual-phase starting microstructures. In order to improve the combination of strength and ductility, ultrafine grained heterostructured dual-phase (UFG-HSDP) steels including soft ferrite grains which are completely embedded in hard martensite grains, have been produced [1]. The proposed process involves cyclic annealing and cold rolling of martensitic steel in order to obtain a nano-lamellar microstructure followed by intercritical annealing for a short time.…”

Section: Introductionmentioning

confidence: 99%

improvement of tensile properties of low-carbon steels via short-time intercritical annealing

Mohsenzadeh

2023

Acta Metall Slovaca

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The effect of low volume fraction formation of martensite on the tensile properties of low carbon steel was evaluated. First, steel samples with ferrite-cementite microstructure were produced. The thermomechanical treatment used included austenitizing at 1000 °C and then quenching in ice brine solution, tempering the obtained martensitic structure for 1 h at 650 °C, 80% cold rolling, and re-tempering for 2 h at 650 °C. In order to form a low volume fraction of martensite, steel samples with ferrite-cementite microstructure were intercritically annealed for 30 seconds at 740 °C. As a result of intercritical annealing treatment, 6.2% martensite was formed. The results of tensile test showed that the formation of 6.2% martensite led to the elimination of yield point phenomenon and Lüders banding, decrease of yield stress and increase of true stress at maximum load, while true uniform strain did not change significantly. The work hardening rate also increased significantly. Based on the results of modeling of the flow behavior with the Holloman equation, the work hardening capability of the steel sample including ferrite-cementite decreased after a certain plastic strain, while the work hardening capacity remained constant with the formation of a low volume fraction of martensite in the microstructure.

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Dual-phase hetero-structured strategy to improve ductility of a low carbon martensitic steel

Cited by 56 publications

References 64 publications

Effect of Intercritical Annealing Time on the Microstructure and Mechanical Properties of Dual‐Phase Steel Processed by Large‐Strain Asymmetric Cold‐Rolling

Effect of Intercritical Annealing Time on the Microstructure and Mechanical Properties of Dual‐Phase Steel Processed by Large‐Strain Asymmetric Cold‐Rolling

Microstructure Evolution and Work Hardening Behavior of Hot-Rolled DP780 Ferrite/Bainite Dual-Phase Steel

improvement of tensile properties of low-carbon steels via short-time intercritical annealing

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