Effect of Austenite Grain Size on the Hot Ductility of Nb-Bearing Peritectic Steel

Cai, Zhuhua; An, Jiazhi; Cheng, Biao; Zhu, Miaoyong

doi:10.1007/s11661-022-06854-4

Cited by 4 publications

(8 citation statements)

References 33 publications

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“…When the stress exceeds the strength that the ferrite film can bear, it will cause the formation of micropores in the ferrite film and then coalesce and grow up to macroscopic cracks along the growth direction of ferrite film. [73][74][75][76] Figure 12. a) Ferrite volume fraction and b) average diameter of Nb(C, N) in different austenite grains size.…”

Section: Microstructure At High Temperaturesmentioning

confidence: 99%

“…Reproduced with permission. [74] Copyright 2023, Springer Nature. In terms of the effect of austenite grain boundary ferrite film on the hot ductility of steel, it is generally believed that when the thickness of the ferrite film exceeds 5 μm, the hot ductility quickly decreases with the increase of ferrite film thickness.…”

Section: Microstructure At High Temperaturesmentioning

confidence: 99%

“…Meanwhile, the average diameter of the precipitates and the volume fraction of film‐like proeutectoid ferrite will decrease with the increase of austenite grain size, as shown in Figure 12 . [ 74 ] The decreases in the average diameter of precipitates and the volume fraction of film‐like proeutectoid ferrite will cause strain concentration at the austenite grain boundaries, which decreases hot ductility.…”

Section: Formation Causes Of Transverse Corner Cracksmentioning

confidence: 99%

Section: Formation Causes Of Transverse Corner Cracksmentioning

confidence: 99%

See 3 more Smart Citations

Formation Mechanism and Control Technology of Transverse Corner Cracks During Slab Continuous Casting of Microalloyed Steels

Zhu,

Cai

2023

steel research int.

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Microalloyed steel with Nb, V, Ti, and other alloying elements is one of the important steel grades in the steel industry. During continuous casting process, high occurrence rate of transverse corner cracks in slabs restricts the quality and efficiency of the production of microalloyed steel grades, and it has not been effectively solved for a long time. Herein, the research progress on the formation mechanism, influential factors, and typical control technologies of transverse corner cracks during slab continuous casting are reviewed. Considering high‐temperature solidification process of microalloyed steel, the control of growth of microstructures and the precipitation behavior of carbonitrides in slab corners are supposed to be the key to avoid transverse corner cracks during slab continuous casting.

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Section: Microstructure At High Temperaturesmentioning

confidence: 99%

Section: Microstructure At High Temperaturesmentioning

confidence: 99%

Section: Formation Causes Of Transverse Corner Cracksmentioning

confidence: 99%

Section: Formation Causes Of Transverse Corner Cracksmentioning

confidence: 99%

See 2 more Smart Citations

Formation Mechanism and Control Technology of Transverse Corner Cracks During Slab Continuous Casting of Microalloyed Steels

Zhu,

Cai

2023

steel research int.

Self Cite

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show abstract

“…On this basis, many researchers have explored the causes and mechanisms of hot ductility degradation of continuous casting slabs within the third brittle zone. Considerable research [12][13][14][15][16] has shown that in the temperature range of continuous casting production, microalloying elements, such as Nb, Ti, and V, easily form carbides, nitrides, or carbonitrides and precipitate at austenite grain boundaries. Under applied external force or deformation conditions, the stress level or strain concentration increased in the vicinity of the precipitates, which led to a rapid deterioration of the as-cast slab hot ductility [17].…”

Section: Introductionmentioning

confidence: 99%

Effect Mechanism of α-Ferrite Sustained Precipitation on High-Temperature Properties in Continuous Casting for Peritectic Steel

Ai,

Li,

Long

et al. 2024

Metals

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Exploring the mechanism of the α-ferrite precipitation process on high-temperature properties plays an important guiding role in avoiding slab cracks and effectively regulating quality. In this work, in situ observation of the α-ferrite sustained precipitation behavior for peritectic steel during the austenitic phase transition process has been investigated using high-temperature confocal scanning laser microscopy. Meanwhile, the high-temperature evolution of the phase fractions during the phase transition process was quantitatively analyzed based on the high-temperature expansion experiment using the peak separation method. Furthermore, the high-temperature properties variations of the casting slab during the α-ferrite sustained precipitation process were investigated with the Gleeble thermomechanical simulator. The results show that the film-like ferrite precipitated along the austenite grain boundaries at the initial stage of phase transition, then needle-like ferrite initiates rapid precipitation on film-like ferrite when the average thickness reaches 15~20 μm. Hot ductility reached a minimum at the ferrite phase fraction fα = 10~15%, while high-temperature properties returned to a higher level after fα > 40~45%. The appearance of a considerable amount of needle-like ferrite and grain refinement effectively improves the high-temperature properties with the α-ferrite precipitation process advances.

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A prediction model for austenite grain size distribution of casting slab in thermal rebound process: Considering α-ferrite precipitation and re-austenization

Ai,

Zhang,

Long

et al. 2024

Journal of Materials Research and Technology

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Effect of Austenite Grain Size on the Hot Ductility of Nb-Bearing Peritectic Steel

Cited by 4 publications

References 33 publications

Formation Mechanism and Control Technology of Transverse Corner Cracks During Slab Continuous Casting of Microalloyed Steels

Formation Mechanism and Control Technology of Transverse Corner Cracks During Slab Continuous Casting of Microalloyed Steels

Effect Mechanism of α-Ferrite Sustained Precipitation on High-Temperature Properties in Continuous Casting for Peritectic Steel

A prediction model for austenite grain size distribution of casting slab in thermal rebound process: Considering α-ferrite precipitation and re-austenization

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