Effect of Second Phase on the Deformation and Fracture Behavior of Multiphase Low-Density Steels

Park, Seongjun; Heo, Yoon-Uk; Choi, Yong; Lee, Keunho; Han, Heung Nam; Suh, Dong‐Woo

doi:10.1007/s11837-014-1060-6

Cited by 16 publications

(10 citation statements)

References 18 publications

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“…8a) in comparison to 600 °C\10 -3 s -1 . However, the microstructures of both conditions are characterized with formation of longitudinal micro-cracks along the ferrite phase boundaries due to dissimilar plastic behavior of phases at ferrite\austenite interfaces [42][43][44][45]. Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Hot deformation characterization of duplex low-density steel through 3D processing map development

Mohamadizadeh

Zarei-Hanzaki

Abedi

et al. 2015

Materials Characterization

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Section: Accepted Manuscriptmentioning

confidence: 99%

Hot deformation characterization of duplex low-density steel through 3D processing map development

Mohamadizadeh

Zarei-Hanzaki

Abedi

et al. 2015

Materials Characterization

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“…The increase in micro‐holes decreased the cross‐sectional area of the matrix between adjacent pores, dividing the matrix into a plurality of small units, each of which could be viewed as an independent, small tensile specimen. Under stress, internal necking occurred and caused the micro‐holes to connect with each other to form cracks . A three‐dimensional zone of tensile stress and a concentrated zone of plastic deformation were observed at the tip of the crack, and new micro‐holes formed in the region.…”

Section: Mechanical Propertymentioning

confidence: 99%

Effect of Yttrium and Titanium on Inclusions and the Mechanical Properties of 9Cr RAFM Steel Fabricated by Vacuum Melting

Zhan

Qiu

Zhang

2017

steel research int.

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Process of adding yttrium into the melt is not a common method for ODS steel production. In this paper, 9Cr-ODS alloy is prepared by adding Y or Y and Ti into 9Cr steel through vacuum induction melting. Optical microscopy is employed to determine the size and number of particles, scanning electron microscopy is used to examine particle type, and transmission electron microscopy (TEM) is used to determine the compositions of smaller particles. Micron-size inclusions are observed in the ingots of the #2 and #3 steels; over 30% of the inclusions are 0.5-1 mm in size, and more than 85% are 0.5-3 mm. A large number of Y-Ti-O particles smaller than 0.5 mm are found in the #3 steel, and the density of inclusions reaches 2.69 Â 10 19 m À3 . After heat treatment, the particles size decreases, and Ti effectively promotes carbide precipitation. Some nano-sized Y-Ti-O is detected by TEM. The tensile strength of Y (Y-Ti) alloyed steel reaches 640 (700) MPa at 298 K, and fracturing mainly occurrs via micro-hole aggregation. At 923 K, the tensile strength of the Y (Y-Ti) alloyed steel reaches 254 (270) MPa. These properties are superior to those of 9Cr steel prepared using the same process.

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“…In summary, the current study demonstrates that CBE opens up alternative routes to achieve unique microstructures other than via conventional GBE approaches, leading to ductile and strong steels without high carbon content and expensive doping elements. The S4) (13,(23)(24)(25). To allow a fair comparison, all data are from tensile tests with a gauge geometry obeying the ASTM E8/E8M standard.…”

Section: Discussionmentioning

confidence: 99%

Chemical boundary engineering: A new route toward lean, ultrastrong yet ductile steels

et al. 2020

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For decades, grain boundary engineering has proven to be one of the most effective approaches for tailoring the mechanical properties of metallic materials, although there are limits to the fineness and types of microstructures achievable, due to the rapid increase in grain size once being exposed to thermal loads (low thermal stability of crystallographic boundaries). Here, we deploy a unique chemical boundary engineering (CBE) approach, augmenting the variety in available alloy design strategies, which enables us to create a material with an ultrafine hierarchically heterogeneous microstructure even after heating to high temperatures. When applied to plain steels with carbon content of only up to 0.2 weight %, this approach yields ultimate strength levels beyond 2.0 GPa in combination with good ductility (>20%). Although demonstrated here for plain carbon steels, the CBE design approach is, in principle, applicable also to other alloys.

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Effect of Second Phase on the Deformation and Fracture Behavior of Multiphase Low-Density Steels

Cited by 16 publications

References 18 publications

Hot deformation characterization of duplex low-density steel through 3D processing map development

Hot deformation characterization of duplex low-density steel through 3D processing map development

Effect of Yttrium and Titanium on Inclusions and the Mechanical Properties of 9Cr RAFM Steel Fabricated by Vacuum Melting

Chemical boundary engineering: A new route toward lean, ultrastrong yet ductile steels

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