A new 1.2 GPa-strength plain low carbon steel with high ductility obtained by SRDR of martensite and intercritical annealing

Jamaati, Roohollah; Aval, Hamed Jamshidi

doi:10.1016/j.msea.2020.139584

Cited by 30 publications

(7 citation statements)

References 55 publications

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“…The uniform distribution of shear strain (caused by the asymmetric rolling) is responsible for the uniform distribution of martensite. [18,38]…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Recently, Yaghoobi et al [ 18 ] investigated the influence of asymmetric rolling and intercritical annealing time on the microstructure and mechanical behavior of DP steel with 0.16 wt% carbon content. They found that the martensite islands were very uniformly distributed in the ferrite matrix due to the homogeneous distribution of shear strain through the thickness caused by performing the asymmetric cold‐rolling.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The uniform distribution of shear strain (caused by the asymmetric rolling) is responsible for the uniform distribution of martensite. [18,38]…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

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.

Self Cite

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“…(2) The intercritical annealing time: The effect of intercritical annealing time in the α + γ zone is similar to that of intercritical annealing temperature. So, increasing the intercritical annealing time commonly increases the MVF [89,111].…”

Section: Mvf Contribution On the Strengtheningmentioning

confidence: 99%

Microstructural Characteristics and Strengthening Mechanisms of Ferritic–Martensitic Dual-Phase Steels: A Review

Badkoobeh

Mostaan

Rafiei

et al. 2022

Metals

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Ferritic–martensitic dual-phase (DP) steels are prominent and advanced high-strength steels (AHSS) broadly employed in automotive industries. Hence, extensive study is conducted regarding the relationship between the microstructure and mechanical properties of DP steels due to the high importance of DP steels in these industries. In this respect, this paper was aimed at reviewing the microstructural characteristics and strengthening mechanisms of DP steels. This review article represents that the main microstructural characteristics of DP steels include the ferrite grain size (FGS), martensite volume fraction (MVF), and martensite morphology (MM), which play a key role in the strengthening mechanisms and mechanical properties. In other words, these can act as strengthening factors, which were separately considered in this paper. Thus, the properties of DP steels are intensely governed by focusing on these characteristics (i.e., FGS, MVF, and MM). This review article addressed the improvement techniques of strengthening mechanisms and the effects of hardening factors on mechanical properties. The relevant techniques were also made up of several processing routes, e.g., thermal cycling, cold rolling, hot rolling, etc., that could make a great strength–ductility balance. Lastly, this review paper could provide substantial assistance to researchers and automotive engineers for DP steel manufacturing with excellent properties. Hence, researchers and automotive engineers are also able to design automobiles using DP steels that possess the lowest fuel consumption and prevent accidents that result from premature mechanical failures.

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“…Further, we conducted the EDS surface scanning experiment for the area shown in figure 6a AR technology was a large plastic deformation method that had emerged in the 1940s [16,17]. In the Asymmetric rolling process, the speed of the upper and lower rolls was different or the roll diameter of the upper and lower rolls was different [18].…”

Section: Microstructure Analysismentioning

confidence: 99%

Effect of asymmetric rolling on microstructure and mechanical properties of aluminum matrix composites

Luo

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The lightweight of structural materials was an important research focus for reduced energy consumption and transport efficiency. Aluminium matrix composites (AMCs) had the advantages of high specific strength and good wear resistance, so they were widely used in automobile, aerospace and other fields. At present, the deformation mechanism of AMCs reinforced by high-entropy alloy particles (HEAp) in asymmetric rolling was not clear. In this work, AMCs ingot reinforced with 6 wt% HEAp was prepared by stir casting process. Then the mechanical properties of HEAp/AMCs under different rolling processes were studied by asymmetric rolling (AR) and asymmetric cryorolling (ACR) processes. High-entropy alloy (HEA) had excellent strength and toughness, which imparted good deformation ability when added to AMCs as reinforcement. The microstructure of AMCs reinforced by HEAp was refined by ACR. At the same time, the HEAp/AMCs obtained by ACR displayed a higher ultimate tensile strength (UTS) than that obtained by AR. The study of ACR shows that AMCs reinforced with HEAp have good toughness. ACR can reduce the thickness of HEAp/AMCs to a greater extent so as to produce AMCs strip with excellent mechanical properties.

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A new 1.2 GPa-strength plain low carbon steel with high ductility obtained by SRDR of martensite and intercritical annealing

Cited by 30 publications

References 55 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

Microstructural Characteristics and Strengthening Mechanisms of Ferritic–Martensitic Dual-Phase Steels: A Review

Effect of asymmetric rolling on microstructure and mechanical properties of aluminum matrix composites

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