Effects of Electric Pulse on Solidification Process of Fe-C-S Alloy Treated with RE

2011 ◽  
Vol 399-401 ◽  
pp. 189-194
Author(s):  
Hai Chuan Wang ◽  
Xin Li ◽  
Zhi You Liao ◽  
Ming Li ◽  
Zhang Xiu Qian ◽  
...  
Keyword(s):  
Rare Earth ◽  
Molten Steel ◽  
Electric Pulse ◽  
Solidification Process ◽  
Solidification Microstructure ◽  
Pulse Field ◽  
Distribution Of Elements

The experiment has studied the effect of solidification process of Fe-C-S alloy treated RE on the distribution of elements and inclusions on the distribution of elements and inclusions after the electric pulse field is applied. The results show that Rare Earth in the molten steel has played a purification role and change the strip MnS inclusions into spherical sulfide inclusions. Meanwhile, the co-action of electric pulse field and Rare Earth can reduce and refine inclusions and improve the distribution of elements in solidification microstructure.

scholarly journals Role of hydrostatic pressure and wall effect in solidification of TC8 alloy

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Xinghong Luo ◽  
Yaya Wang ◽  
Yang Li
Keyword(s):  
Hydrostatic Pressure ◽  
Normal Gravity ◽  
Early Stage ◽  
Solidification Process ◽  
Wall Effect ◽  
Solidification Microstructure ◽  
Drop Tube ◽  
Aspect Ratios ◽  
Equiaxed Grains

Abstract The solidification experiments of TC8 alloy under both microgravity and normal gravity were conducted using a drop tube. The solidification microstructure were found composed of fine equiaxed grains formed at early stage and bigger elongated grains formed at later stage. Between the two kinds of grains a curved transition interface was observed in 1g sample, while that in μg sample was almost flat. Generally, the amounts and aspect ratios of the grains are larger, and the grain sizes are smaller in 1g sample. Besides, no visible element macrosegregation occurred in both samples. The results suggest that the solidification velocities of the samples were rapid, and consequently the convection effect and solute transport effect caused by gravity had little influence on the solidification microstructure. Therefore, the solidification process was mainly controlled by thermal diffusion, and hydrostatic pressure and wall effect played a great role in it.

scholarly journals Solidification Microstructure of Ingots and Continuously Cast Slabs Treated with Rare Earth Metal

1980 ◽  
Vol 66 (6) ◽  
pp. 618-627 ◽  
Author(s):  
Yoshio NURI ◽  
Tetsuro OHASHI ◽  
Takeshi HIROMOTO ◽  
Osamu KITAMURA
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Solidification Microstructure ◽  
Continuously Cast

Experimental Study on the Impact of Macrosegregation Formation of the Al-Bi Hypermonotectic Alloys

2017 ◽  
Vol 727 ◽  
pp. 106-110
Author(s):  
Zhi Qiang Kang ◽  
Xue Yang ◽  
Guo Hui Feng ◽  
Lin Zhang
Keyword(s):  
Solidification Process ◽  
Average Diameter ◽  
Solidification Microstructure ◽  
Number Density ◽  
Gravity Condition ◽  
Leading Role ◽  
Gravity Settling ◽  
The Difference ◽  
The Impact ◽  
And Diffusion

The solidification experiments about macrosegregation formation of the Al-10%Bi hyper monotectic alloys under gravity conditions have been carried out. The results showed that the average diameter of the Bi-rich droplets linearly increases and the number density of the Bi-rich droplets exponentially decreases with solidification time under the gravity condition. Because of gravity settling and collisions coagulation between the droplets, area fraction of Bi-rich increased rapidly in the bottom of samples during early solidification. It’s easy to form Bi-rich layer at the bottom of the sample. The analysis demonstrates that nucleation and diffusion growth of drops are the dominant factors influencing the solidification microstructure during the early solidification and the same distribution of Bi-rich in different locations of sample. As the solidification process, gravity migration and collision coagulation beginning to play the leading role, lead to the difference in the distribution of Bi-rich droplets in different locations of sample 90%e5%a2%9e%e5%a4%a7&tjType=sentence&style=&t=increases+gradually" increases gradually in the same time. It caused macrosegregation of the final solidification microstructure under the gravity condition.

Characteristics and Evolution Mechanism of Solidification Microstructure for Laser Additive Manufactured Ti2AlNb-Based Alloy

2018 ◽  
Vol 913 ◽  
pp. 118-125
Author(s):  
Yang Jie Tang ◽  
Yong Zhong Zhang ◽  
Yan Tao Liu ◽  
Wei Pan
Keyword(s):  
Crystal Structure ◽  
Tensile Properties ◽  
Solidification Process ◽  
High Strength ◽  
Solidification Microstructure ◽  
Columnar Dendrite ◽  
Solidification Velocity ◽  
Thin Wall ◽  
Dendrite Structure ◽  
Evolution Mechanism

Laser additive manufacturing (LAM) technology was applied to prepare Ti-22Al-25Nb alloy thin-wall sample. The characteristics and evolution mechanism of solidification microstructure were investigated, and the tensile properties at horizontal and vertical directions were discussed. The results indicated that the solidification microstructure in single deposition layer evolved as: plane crystal structure, cellular crystal structure, columnar dendrite structure and equiaxed dendrite structure, from the bottom to the top of the molten pool. During the solidification process, the temperature gradient and solidification velocity decided the grain growth morphology. However, the grain of the as-deposited materials grew up to thick equaxied structure when the upper layer was forming. The tensile properties at horizontal and vertical directions were not much different, both of these exhibited high strength and low ductility.

scholarly journals Solidification of Immiscible Alloys under High Magnetic Field: A Review

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 525
Author(s):  
Chen Wei ◽  
Jun Wang ◽  
Yixuan He ◽  
Jinshan Li ◽  
Eric Beaugnon
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Microstructure Evolution ◽  
Magnetic Force ◽  
Solidification Process ◽  
Solidification Microstructure ◽  
Migration Behavior ◽  
Magnetic Field Effects ◽  
Immiscible Alloys ◽  
Immiscible Alloy

Immiscible alloy is a kind of functional metal material with broad application prospects in industry and electronic fields, which has aroused extensive attention in recent decades. In the solidification process of metallic material processing, various attractive phenomena can be realized by applying a high magnetic field (HMF), including the nucleation and growth of alloys and microstructure evolution, etc. The selectivity provided by Lorentz force, thermoelectric magnetic force, and magnetic force or a combination of magnetic field effects can effectively control the solidification process of the melt. Recent advances in the understanding of the development of immiscible alloys in the solidification microstructure induced by HMF are reviewed. In this review, the immiscible alloy systems are introduced and inspected, with the main focus on the relationship between the migration behavior of the phase and evolution of the solidification microstructure under HMF. Special attention is paid to the mechanism of microstructure evolution caused by the magnetic field and its influence on performance. The ability of HMF to overcome microstructural heterogeneity in the solidification process provides freedom to design and modify new functional immiscible materials with desired physical properties. This review aims to offer an overview of the latest progress in HMF processing of immiscible alloys.

Synthesis of R2 Fe14 B Single Crystals

1987 ◽  
Vol 96 ◽  
Author(s):  
B. N. Das ◽  
N. C. Koon
Keyword(s):  
Rare Earth ◽  
Crystal Growth ◽  
Single Crystals ◽  
Growth Process ◽  
Alloy Composition ◽  
Crystal Quality ◽  
Solidification Microstructure ◽  
Growth Processes ◽  
Crystal Growth Process ◽  
Isomorphous Replacement

ABSTRACTSingle crystals of R2 Fe14 B weighing 5 to 15 g were grown from a liquid melt by tri-arc and levitation Czochralski methods. The arc method was used for the growth of smaller size crystals from 5 to 7 g, and the levitation method was used for the growth of larger sizes, from 10 to 15 g. Crystals of (R1)2 –x(R2)xFe14 B could also be grown with isomorphous replacement of rare earth atoms. The starting alloy composition for the crystal growth process was chosen based on solidification microstructure. In this paper we discuss the solidification microstructure, isomorphous replacement, seeding and their interactions with the crystal growth processes and crystal quality.

Effect of Ce-La on inclusion evolution in Al-killed high strength steel

2020 ◽  
Vol 117 (6) ◽  
pp. 616
Author(s):  
Ruming Geng ◽  
Jing Li ◽  
Chengbin Shi ◽  
Jianguo Zhi ◽  
Bin Lu
Keyword(s):  
Rare Earth ◽  
Dissolved Oxygen ◽  
Molten Steel ◽  
High Strength Steel ◽  
High Strength ◽  
Thermodynamic Calculations ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Rare Earth Addition ◽  
La Addition

The mechanism of inclusion evolution after rare earth addition based on oxide metallurgy was investigated experimentally and using thermodynamic calculations, where Ce-La was added to Al-killed high strength steel during Ruhrstahl-Heraeus refining to modify the oxide inclusions within the steel. The typical inclusions observed before Ce-La addition were spherical magnesium aluminate spinel inclusions. And fewer individual Al2O3 inclusions and Al2O3–TiOx inclusions were also observed. The addition of Ce-La led to transformation of MgO · Al2O3 spinel inclusions to (Ce,La)2O3, (Ce,La)2O2S and (Ce,La)2O2S + MgO · Al2O3 inclusions. Thermodynamic calculations indicated that Ce-La combined with dissolved oxygen and sulfur in molten steel to form rare earth inclusions, while the remainder of the Ce and La modified MgO · Al2O3 to (Ce,La)2O3 and (Ce,La)2O2S.

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