Analysis of Rapid Solidification Process in The Double-Roller Method

1985 ◽  
Vol 58 ◽  
Author(s):  
F. Kogiku ◽  
M. Yukumoto ◽  
K. Shibuya ◽  
M. Ozawa ◽  
T. Kan
Keyword(s):  
Heat Transfer ◽  
Cooling Rate ◽  
Rapid Solidification ◽  
Solidification Process ◽  
Silicon Steel ◽  
The Other ◽  
Rapid Solidification Process ◽  
Equiaxed Zone ◽  
High Silicon Steel ◽  
Rapidly Solidified

ABSTRACTHigh-silicon steel was rapidly solidified to thin strips by the double roller method. Two typical macrostructures were observed: one with an equiaxed zone and the other without. The formation of the equiaxed zone is caused by an excessive gap between the rollers. Heat transfer calculations and dendrite arm syacing measurements both suggested that the cooling rate is about 103 to 104 K/sec.

Numerical Simulation on Rapidly Solidified Melt Spinning CuFe10 Alloys

2011 ◽  
Vol 228-229 ◽  
pp. 416-421
Author(s):  
Zhi Ming Zhou ◽  
Wei Jiu Huang ◽  
M. Deng ◽  
Min Min Cao ◽  
Li Wen Tang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
Vacuum Chamber ◽  
Solidification Process ◽  
One Dimensional ◽  
Heat System ◽  
Heat Transfer Theory ◽  
Rapidly Solidified

The numerical simulation model of single roller rapid solidification melt-spinning CuFe10 alloys was built in this paper. The vacuum chamber, cooling roller and sample were taken into account as a holistic heat system. Based on the heat transfer theory and liquid solidification theory, the heat transfer during the rapids solidification process of CuFe10 ribbons prepared by melt spinning can be approximately modeled by one-dimensional heat conduction equation, so that the temperature distribution and the cooling rate of the ribbon can be determined by the integration of this equation. The simulative results are coincident very well with the microstructure of rapid solidification melt spinnng CuFe10 alloys at three different wheel speeds 4, 12 and 36 m/s.

Phase Formation of Fe-Mn Binary Alloy During Sub-Rapid Solidification

2011 ◽  
Vol 391-392 ◽  
pp. 741-744 ◽  
Author(s):  
Rong Yang ◽  
Wen Bin Xia ◽  
Chang Jiang Song ◽  
Qin Peng ◽  
Xian Yong He ◽  
...  
Keyword(s):  
Experimental Study ◽  
Cooling Rate ◽  
Rapid Solidification ◽  
Phase Formation ◽  
Binary Alloy ◽  
Manganese Content ◽  
Solidification Process ◽  
Rapid Solidification Process ◽  
Micro Hardness

An experimental study on the influence of cooling rate and manganese content on the structures and phase formation of Fe-Mn alloy was carried out during sub-rapid solidification process. BCC structures were obtained for samples with manganese content ranging from 2pct to 11pct, and a HCP phase was obtained when the manganese content is up to 15pct. The micro- hardness increases with cooling rate and manganese content increasing.

The characteristic of crystal growth of Nd–Fe–B cast strips during the rapid solidification process

2015 ◽  
Vol 396 ◽  
pp. 283-287 ◽  
Author(s):  
Jingdai Wang ◽  
Yu Meng ◽  
Huaxia Zhang ◽  
Hui Tang ◽  
Rongbing Lin ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Rapid Solidification ◽  
Solidification Process ◽  
Rapid Solidification Process

Conjugate Heat Transfer and Effects of Interfacial Heat Flux During the Solidification Process of Continuous Castings

2003 ◽  
Vol 125 (2) ◽  
pp. 339-348 ◽  
Author(s):  
M. Ruhul Amin ◽  
Nikhil L. Gawas
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Cooling Rate ◽  
Solidification Process ◽  
Air Gap ◽  
Gap Formation ◽  
Continuous Casting Mold ◽  
Withdrawal Velocity ◽  
Multiphase Fluid Flow ◽  
Multiphase Fluid

Multiphase fluid flow involving solidification is common in many industrial processes such as extrusion, continuous casting, drawing, etc. The present study concentrates on the study of air gap formation due to metal shrinkage on the interfacial heat transfer of a continuous casting mold. Enthalpy method was employed to model the solidification of continuously moving metal. The effect of basic process parameters mainly superheat, withdrawal velocity, mold cooling rate and the post mold cooling rate on the heat transfer was studied. The results of cases run with air gap formation were also compared with those without air gap formation to understand the phenomenon comprehensively. The current study shows that there exists a limiting value of Pe above which the effect of air gap formation on the overall heat transfer is negligible.

Microstructure and Properties of Rapidly Solidified Al-Zn-Mg-Cu Alloy

2020 ◽  
Vol 993 ◽  
pp. 203-207
Author(s):  
Wei Min Ren ◽  
Zi Yong Chen ◽  
Zhi Lei Xiang ◽  
Li Hua Chai
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Cooling Rate ◽  
Rapid Solidification ◽  
Second Phase ◽  
Alloy Strip ◽  
Roller Speed ◽  
Microstructure And Properties ◽  
Cu Alloy ◽  
Rapidly Solidified

Refining grain plays an important role in improving the mechanical properties of aluminum alloys. However, the conventional casting method with a slow cooling rate can be easy to cause coarseness of the microstructure and serious segregation. In this paper, the rapid solidification of Al-Zn-Mg-Cu alloy was prepared by the single-roller belt method. The alloy strip was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and hardness test to study the microstructure and properties of the rapidly solidified aluminum alloy. The results show that the roller speed was an important parameters affecting the formability of the alloy. When the roller speed was 15 m/s, the aluminum alloy produced a thin bandwidth of 5 mm and a thickness of 150 um. As the rotation speed of the roller increased, the cooling rate of the melt increased, and the microstructure of the rapidly solidified Al-Zn-Mg-Cu aluminum alloy strip improved in grains refinement. Compared with the conventionally cast Al-Zn-Mg-Cu aluminum alloys, the Al-Zn-Mg-Cu aluminum alloys prepared by rapid solidification showed much finer crystal grains, and enhanced solid solubility of alloying elements with less precipitation of second phase and high hardness.

Review on Phase-Field Modeling of Microstructure Evolutions: Application to Electron Beam Additive Manufacturing

2014 ◽  
Author(s):  
Seshadev Sahoo ◽  
Kevin Chou
Keyword(s):  
Electron Beam ◽  
Additive Manufacturing ◽  
Rapid Solidification ◽  
Phase Field ◽  
Solidification Process ◽  
Materials Processing ◽  
Rapid Solidification Process ◽  
Phase Field Modeling ◽  
Diffuse Interfaces ◽  
Field Modeling

Powder-bed electron beam additive manufacturing (EBAM) is a relatively new technology to produce metallic parts in a layer by layer fashion by melting and fusing metallic powders. EBAM is a rapid solidification process and the properties of the parts depend on the solidification behavior as well as the microstructure of the build material. Thus, the prediction of part microstructures during the process may be an important factor for process optimization. Nowadays, the increase in computational power allows for direct simulations of microstructures during materials processing for specific manufacturing conditions. Among different methods, phase-field modeling (PFM) has recently emerged as a powerful computational technique for simulating microstructure evolutions at the mesoscale during a rapid solidification process. PFM describes microstructures using a set of conserved and non-conserved field variables and the evolution of the field variables are governed by Cahn-Hilliard and Allen-Cahn equations. By using the thermodynamics and kinetic parameters as input parameters in the model, PFM is able to simulate the evolution of complex microstructures during materials processing. The objective of this study is to achieve a thorough review of PFM techniques used in various processes, attempted for an application to microstructure evolutions during EBAM. The concept of diffuse interfaces, phase field variables, thermodynamic driving forces for microstructure evolutions and the kinetic phase-field equations are described in this paper.

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