In Situ Observation of the Nucleation and Growth of Ferrite Laths in the Heat-Affected Zone of EH36-Mg Shipbuilding Steel Subjected to Different Heat Inputs

Zou, Xiaodong; Sun, Jincheng; Matsuura, Hiroyuki; Wang, Cong

doi:10.1007/s11663-018-1326-4

Cited by 52 publications

(11 citation statements)

References 29 publications

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“…Wang et al studied the nucleation and growth of AF at different cooling rates in Ti-Ca-Zr deoxidized low-carbon steel [20]. Zou et al explored the nucleation and growth of ferrite laths in the HAZ of EH36-Mg shipbuilding steel subjected to different heat inputs [21]. Moreover, intragranular ferrite growth kinetics was systematically analyzed by in situ methodology [22].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Acicular Ferrite Transformation Behavior between Surface and Interior in a Low C–Mn Steel by HT-LSCM

Liu

Yuan

Misra

et al. 2021

Metals

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In this study, the acicular ferrite transformation behavior of a Ti–Ca deoxidized low carbon steel was studied using a high-temperature laser scanning confocal microscopy (HT-LSCM). The in situ observation of the transformation behavior on the sample surface with different cooling rates was achieved by HT-LSCM. The microstructure between the surface and interior of the HT-LSCM sample was compared. The results showed that Ti–Ca oxide particles were effective sites for acicular ferrite (AF) nucleation. The start transformation temperature at grain boundaries and intragranular particles decreased with an increase in cooling rate, but the AF nucleation rate increased and the surface microstructure was more interlocked. The sample surface microstructure obtained at 3 °C/s was dominated by ferrite side plates, while the ferrite nucleating sites transferred from grain boundaries to intragranular particles when the cooling rate was 15 °C/s. Moreover, it was interesting that the microstructure and microhardness of the sample surface and interior were different. The AF dominating microstructure, obtained in the sample interior, was much finer than the sample surface, and the microhardness of the sample surface was much lower than the sample interior. The combined factors led to a coarse size of AF on the sample surface. AF formed at a higher temperature resulted in the coarse size. The available particles for AF nucleation on the sample surface were quite limited, such that hard impingement between AF plates was much weaker than that in the sample interior. In addition, the transformation stress in austenite on the sample surface could be largely released, which contributed to a coarser AF plate size. The coarse grain size, low dislocation concentration and low carbon content led to lower hardness on the sample surface.

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Section: Introductionmentioning

confidence: 99%

A Comparative Study of Acicular Ferrite Transformation Behavior between Surface and Interior in a Low C–Mn Steel by HT-LSCM

Liu

Yuan

Misra

et al. 2021

Metals

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“…[2,3] In addition, their agglomeration behavior relates to the inclusion size, which is an important factor for inclusion roles as a nucleation site to induce intragranular acicular ferrite nucleation. [4][5][6][7][8][9] Moreover, there is a concept, inclusion engineering, that deals with the control of the amount, morphology, size distribution, and composition of nonmetallic inclusions formed in the liquid steel during refining and solidification. [10] To better understand the mechanism of inclusion agglomeration behavior, the experimental studies using both in-situ [11][12][13][14][15] and ex-situ [16][17][18][19] methodologies have been performed.…”

Section: Introductionmentioning

confidence: 99%

Assessment of a Simplified Correlation Between Wettability Measurement and Dispersion/Coagulation Potency of Oxide Particles in Ferrous Alloy Melt

Nakajima

Jönsson

2019

Metall Mater Trans B

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This article seeks to demonstrate a direct and simplified correlation between the measurement of the wettability and the agglomeration potency of the inclusion particles in liquid ferrous alloy. The established methodology has been validated by the agreement between the calculated coagulation coefficient of Al 2 O 3 particles and the experimental data in the open literature. Subsequently, the coagulation coefficient of Al 2 O 3 , MgO, and Ti 2 O 3 particles in ferrous alloy melts was evaluated quantitatively by the proposed method using the actual experimental data of contact angle and surface tension. Meanwhile, the effect of the matrix composition has been investigated by comparing the Hamaker constant and coagulation coefficient between Ti 2 O 3 / pure iron and Ti 2 O 3 /low-carbon steel systems. It is noted that the change of coagulation coefficient associated with the contact angle is caused by the formation of a new phase at the oxide/metal interface at the high temperature. The present work aims to provide a deep understanding of the connection between inclusion motion behavior in the liquid alloy and the high temperature interfacial phenomenon.

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“…And the property of metal materials are significantly affected by nonmetal inclusions. 1) So it is essential to study the inclusion behavior in the molten steel. The inclusion removal is related to inclusion agglomeration and inclusion flotation, 2,3) inclusion absorption by the top slag and the lining refractory, 2,4) inclusion transport behavior, inclusion-bubble interaction, 5,6) EM separation and Ostwald ripening growth.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Collision-Coalescence and Removal of Inclusion in Tundish with Channel Type Induction Heating

Lei

Yang

et al. 2019

ISIJ Int.

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Numerical simulation is an effective tool to analyze the inclusion behavior in the tundish with channel induction heating. And the inclusion mass/population conservation model is applied to predict and describe inclusion physical field. Due to the channel induction heating, Archimedes slipping velocity and Archimedes collision are applied to describe the inclusion behavior in the tundish with channel induction heating. The predicted values agree with the experimental data for the inclusion model. Numerical results show that Joule heat and electromagnetic force can prompt the inclusion removal rate. Compared with Joule heat, electromagnetic force is a more important factor to affect the inclusion's movement and Archimedes collision is also one of the important collision mechanisms for inclusion coalescence. The inclusion removal rate in the channels is up to one third of the inclusion removal rate in the tundish, and the inclusion removal rate in the tundish increases from 21.4% to 35.05% if channel induction heating is applied.

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In Situ Observation of the Nucleation and Growth of Ferrite Laths in the Heat-Affected Zone of EH36-Mg Shipbuilding Steel Subjected to Different Heat Inputs

Cited by 52 publications

References 29 publications

A Comparative Study of Acicular Ferrite Transformation Behavior between Surface and Interior in a Low C–Mn Steel by HT-LSCM

A Comparative Study of Acicular Ferrite Transformation Behavior between Surface and Interior in a Low C–Mn Steel by HT-LSCM

Assessment of a Simplified Correlation Between Wettability Measurement and Dispersion/Coagulation Potency of Oxide Particles in Ferrous Alloy Melt

Numerical Simulation of Collision-Coalescence and Removal of Inclusion in Tundish with Channel Type Induction Heating

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