Impact of Cold‐Rolling and Heat Treatment on Mechanical Properties of Dual‐Phase Treated Low Carbon Steel

Long, Lê Văn; Hien, Dinh Van; Thành, Nguyễn Trường; Tho, Nguyen Chi; Thom, Do Van

doi:10.1155/2020/1674837

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…The difference in cold roll reductions in BM-DP and SN-DP was to achieve a relatively similar ferrite grain size in both microstructures. Furthermore, slightly different annealing profiles and overage temperatures were used for annealing of BM-DP and SN-DP, although both are based on industrial annealing cycles used in dual-phase steels, [28][29][30] which are given in Figures 1(a) and (b), respectively. The details of annealing optimization in SN-DP have been excluded in this paper and it will be reported in our future work.…”

Section: Experimental Methodsmentioning

confidence: 99%

Development of a High Ductility DP Steel Using a Segregation Neutralization Approach: Benchmarked Against a Commercial Dual Phase Steel

Dastur,

Slater,

Bandi

et al. 2024

Metall Mater Trans A

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Commercial dual-phase steels are typically synonymous with a banded distribution of martensite in their microstructures, which can degrade ductility and increase the anisotropy of mechanical properties. The concept of neutralizing the effect of Mn segregation is employed to change the distribution of martensite to a non-banded distribution. To this end, the ratio of austenite and ferrite stabilizer elements has been changed in the composition of dual-phase steel. Microstructural analysis has been carried out on both hot-rolled (ferrite + pearlite) and heat-treated (ferrite + martensite) microstructures by optical microscope and EBSD, respectively. The microstructural examinations have confirmed the non-banded distribution of second phase and more equiaxed ferrite grains in the segregated neutralized grade microstructures compared to a commercially benchmarked dual-phase steel. Tensile properties of two grades have also been assessed in hot-rolled and heat-treated conditions in RD, TD, and 45 deg tensile directions. In the case of heat-treated condition, total elongation in RD direction has been improved from 20.9 pct in benchmark dual-phase steel to 25.4 pct in segregated neutralized dual-phase steel. Tensile anisotropy results showed a significant difference in tensile strength by tensile direction in benchmark dual-phase steel in both hot-rolled (~ 85 MPa) and heat-treated conditions (~ 48 MPa), while the corresponding differences for the segregated neutralized grades were 14 and 15 MPa, respectively.

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Section: Experimental Methodsmentioning

confidence: 99%

Development of a High Ductility DP Steel Using a Segregation Neutralization Approach: Benchmarked Against a Commercial Dual Phase Steel

Dastur,

Slater,

Bandi

et al. 2024

Metall Mater Trans A

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“…Finally, the rolled sample was annealed in the two‐phase (ferrite–austenite) region followed by water‐quenching. The following equations were used to calculate the temperatures of Ac 1 and Ac 3 [ 19,20 ]

$$\left(\text{Ac}\right)_{1} \text{= 29} \text{.1 Si �? 10} \text{.7 Mn + 16} \text{.9 Cr �?

…”

Section: Methodsmentioning

confidence: 99%

“…Finally, the rolled sample was annealed in the two-phase (ferrite-austenite) region followed by water-quenching. The following equations were used to calculate the temperatures of Ac 1 and Ac 3 [19,20] The microstructural observations were carried out for the initial (as-received), martensitic (as-quenched), 80% cold-rolled, and annealed samples at two different surfaces including rolling direction-transverse direction (RD-TD) and rolling directionnormal direction (RD-ND). The samples were first ground on SiC paper, polished, and then etched with a 1.5% nital etchant.…”

Section: Methodsmentioning

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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“…Cold forming processes such as cold rolling [1,2,3], cold drawing [4,5], cold extrusion [6,7] are metal fabrication techniques in which metals are shaped below their recrystallization temperature. As the amount of plastic deformation increases during cold forming, the strength and hardness of the formed metal parts increases while its ductility and toughness decrease.…”

Section: Introductionmentioning

confidence: 99%

Effects of Angle and Rate of Twist via Pre-Torsional Deformation on Tensile Properties and Hardness of Hot-Rolled, Low-Alloy Steel Rods

Jantasorn

Thamma

2022

Trends Sci

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The effects of twist angle and twist rate during the pre-torsional deformation on tensile and hardness properties of hot-rolled SCM415 low-alloy steel were investigated. Hot-rolled SCM415 round tensile specimens were pre-torsioned using a free-end torsion machine to 36, 72, 144 and 288 degrees at 2 different twist rates of 0.1 and 30 rpm. As the angle and the rate of twist increased, yield strength and ultimate tensile strength increased with a tradeoff in a reduction in ductility. The relationship of true stress and true strain within the uniform plastic deformation were well described by a power law. The strength coefficient and strain hardening exponent obtained from the power-law curve fitting decreased with increasing twist angle and higher twist rate, suggesting that higher shear strain and shear strain rate led to a decrease in work hardening capacity. The local hardness after pre-torsional deformation showed a positive gradient from specimens’ centers to their surfaces along the radial direction. Also, the local hardness at the same radial position increased with the increasing angle and rate of twist. The average grain sizes were uniform along the radial direction and were comparable for all pre-torsional conditions. The strengthening mechanism via pre-torsional deformation of hot-rolled SCM415 was shown to be dominated by the strain hardening effect. HIGHLIGHTS The effects of twist angle and twist rate during the pre-torsional deformation using a free-end torsion tester on tensile and hardness properties of hot-rolled SCM415 low-alloy steel were investigated Within uniform plastic deformation region, the power-law parameters, namely strength coefficient (K) and strain hardening exponent (n) decreased with increasing amount of shear plastic strain and shear strain rate during the pre-torsional deformation Local Vicker hardness showed a positive gradient from the central region to the surface of pre-torsioned specimens, and the local hardness at the same distance from the center increased with increasing torsional angle and twist rate The average grain sizes of pre-torsioned specimens were found to be unaffected by the amount of torsional angle or the rate of twist The strengthening of hot-rolled SCM415 steel via pre-torsional deformation is predominated by strain hardening effect GRAPHICAL ABSTRACT

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Impact of Cold‐Rolling and Heat Treatment on Mechanical Properties of Dual‐Phase Treated Low Carbon Steel

Cited by 6 publications

References 12 publications

Development of a High Ductility DP Steel Using a Segregation Neutralization Approach: Benchmarked Against a Commercial Dual Phase Steel

Development of a High Ductility DP Steel Using a Segregation Neutralization Approach: Benchmarked Against a Commercial Dual Phase Steel

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

Effects of Angle and Rate of Twist via Pre-Torsional Deformation on Tensile Properties and Hardness of Hot-Rolled, Low-Alloy Steel Rods

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