Effect of microstructure on the crack propagation behavior of microalloyed 560MPa (X80) strip during ultra-fast cooling

Zhao, Junpeng; Hu, W. Z.; Wang, X.; Kang, Jian; Yuan, Guo; Di, Hongshuang; Misra, R.D.K.

doi:10.1016/j.msea.2016.04.073

Cited by 53 publications

(33 citation statements)

References 25 publications

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“…AF was composed of approximately parallel slab ferrite, which combined into bundles with each other. The width of ferrite lath generally ranged from 200 to 500 nm (indicated by the arrow in Figure 5a), which would be beneficial for the strength and low temperature toughness of the material [12,21,22]. In contrast, PF is an essentially equiaxed grain structure, which concentrates at the flatted austenite grain boundary.…”

Section: Resultsmentioning

confidence: 99%

Influence of Effective Grain Size on Low Temperature Toughness of High-Strength Pipeline Steel

et al. 2019

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In this study, the series temperature Charpy impact and drop-weight tear test (DWTT) were investigated, the misorientation angles among structural boundaries where the cleavage crack propagated were identified, and angles of {100} cleavage planes between adjacent grains along the cleavage crack propagated path were calculated in five directions (0°, 30°, 45°, 60°, and 90° to the rolling direction) of high-grade pipeline steel. Furthermore, the effective grain size (grain with misorientation angles greater than 15°) was redefined, and the quantitative influences of the redefined effective grain size on Charpy impact and DWTT is also discussed synthetically. The results showed that the microstructure presented a typical acicular ferrite characteristic with some polygonal ferrite and M-A islands (composed of martensite and retained austenite), and the distribution of the high-angle grain boundaries were mainly distributed in the range of 45°–65° in different directions. The Charpy impact energy and percent shear area of DWTT in the five directions increased with refinement of the redefined effective grain size, composed of grains with {100} cleavage planes less than 35° between grain boundaries. The ductile-to-brittle transition temperature also decreased with the refining of the redefined effective grain size. The redefined effective grain boundaries can strongly hinder fracture propagation through electron backscattered diffraction analysis of the cleavage crack path, and thus redefined effective grain can act as the effective microstructure unit for cleavage.

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Section: Resultsmentioning

confidence: 99%

Influence of Effective Grain Size on Low Temperature Toughness of High-Strength Pipeline Steel

et al. 2019

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“…The new generation of controlled rolling and controlled cooling technology based on ultra-fast cooling (UFC) is one of the most effective technologies to produce high-quality hot-rolled products. [1][2][3][4] The UFC equipment impinges cooling water of 0.4-0.8 MPa onto plate surface of high-temperature through densely arranged nozzles to make steel quickly pass through austenite phase zone, and "freeze" hardened austenite to the dynamic transformation temperature of austenite to ferrite. [5][6][7][8] Increasing the cooling ability of UFC equipment can improve production efficiency and make the production of high-quality steel products possible.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis for Jet Impingement and Heat Transfer Law of Self-Excited Pulsed Nozzle

Zhang¹,

Wang²

2020

ISIJ Int.

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“…Also, grain‐boundary strengthening is a significant mechanism on the comprehensive mechanical properties of steel . Grain refinement in pipeline steel increases the length of grain boundaries, disperses the plastic deformation to other grains, and lowers the internal stress concentration, such that the strength of the material is improved . Interaction between dislocations and grain boundaries plays an important role in strengthening mechanism of metallic materials .…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the Strengthening Mechanism Based on Grain‐Boundary Misorientation of High‐Strength Pipeline Steel

Duan

Pan

et al. 2019

steel research int.

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The microstructure and grain-boundary misorientation of X80 high-strength pipeline steel are analyzed using the scanning electron microscope, the electron backscatter diffraction, and the transmission electron microscope, and the effect of grain-boundary orientation on slip dislocation is investigated by constructing a grain-boundary dislocation model. The results show that the anisotropy of the mechanical properties of X80 pipeline steel is related not only to grain size and microstructure type but also to grain-boundary orientation, which the obstruction effect of the high-angle grain boundary on slip dislocation is significantly greater than that of the low-angle grain boundary. The larger the orientation difference is, the more disorderly the arrangement of atoms on both sides of grain boundary is, and the more difficult it is for dislocations to slip across grain boundary, so the strengthening effect is more remarkable. Also, when the grain-boundary misorientation is greater than 15 , the strengthening effect tends to stabilize due to the influence of the interfacial superposition.

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Effect of microstructure on the crack propagation behavior of microalloyed 560MPa (X80) strip during ultra-fast cooling

Cited by 53 publications

References 25 publications

Influence of Effective Grain Size on Low Temperature Toughness of High-Strength Pipeline Steel

Influence of Effective Grain Size on Low Temperature Toughness of High-Strength Pipeline Steel

Numerical Analysis for Jet Impingement and Heat Transfer Law of Self-Excited Pulsed Nozzle

An Investigation on the Strengthening Mechanism Based on Grain‐Boundary Misorientation of High‐Strength Pipeline Steel

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