Fabrication of Lotus-Type Porous Al-Ti Alloys Using the Continuous Casting Technique

2010 ◽  
Vol 658 ◽  
pp. 207-210
Author(s):  
Tae Bum Kim ◽  
Shinsuke Suzuki ◽  
Hideo Nakajima
Keyword(s):  
Continuous Casting ◽  
Solidification Process ◽  
Hydrogen Atmosphere ◽  
The Other ◽  
Transfer Velocity ◽  
Casting Technique ◽  
Matrix Microstructure ◽  
Ti Alloys ◽  
Peritectic Solidification ◽  
Transfer Direction

Porous Al-5mass%Ti alloys were fabricated using a continuous casting technique in a hydrogen atmosphere, and the effects of transfer velocity (V) and the peritectic solidification process on the pore morphology and matrix microstructure were examined. In the case of V = 0.5 mm/min, columnar microstructure and directional pores grow along the transfer direction. The Al3Ti phases are formed in localized regions of matrix part, and however, they do not suppress the growth of directional pores in the other regions. In the case of 5.0 mm/min, because needle-like Al3Ti phases grow along the transfer direction, directional pores can grow between them. On the other hand, in the case of 10.0 mm/min, spherical pores surrounded by equiaxed peritectic microstructure and homogeneously distributed Al3Ti phases are formed, because the primary α -Al and Al3Ti phases probably prevent the growth of directional pores.

Effect of Transfer Velocity on Porosity of Lotus-Type Porous Aluminum Fabricated by Continuous Casting Technique

2010 ◽  
Vol 658 ◽  
pp. 211-214 ◽  
Author(s):  
Yutaro Iio ◽  
Takuya Ide ◽  
Hideo Nakajima
Keyword(s):  
Stainless Steel ◽  
Continuous Casting ◽  
Formation Process ◽  
Pore Diameter ◽  
Velocity Dependence ◽  
Transfer Velocity ◽  
Casting Technique ◽  
Porous Aluminum ◽  
Lower Solubility ◽  
The Difference

Lotus-type porous aluminum was fabricated by continuous casting technique in mixture gas of hydrogen and argon at various transfer velocities in order to understand formation process of pores. The porosity and pore diameter decrease with increasing transfer velocity. The transfer velocity dependence of the porosity in lotus aluminum is different from that in other lotus metals such as stainless steel and copper. It is considered that the difference is attributed to lower solubility in aluminum than that in other metals.

A Knowledge-Based Approach for Microwire Casting Plant Control

2011 ◽  
pp. 419-437
Author(s):  
S. Zaporojan ◽  
C. Plotnic ◽  
I. Calmicov ◽  
V. Larin
Keyword(s):  
Continuous Casting ◽  
Casting Process ◽  
Video Camera ◽  
The Other ◽  
Advanced Materials ◽  
Casting Plant ◽  
Preliminary Results ◽  
Sensor Applications ◽  
Knowledge Based ◽  
Main Ideas

This chapter presents the main ideas and preliminary results of an applied research project concerning the development of an intelligent plant for microwire casting. The properties of glass-coated microwires are useful for a variety of sensor applications. On the other hand, the process of casting can be one of the methods of nanotechnology and advanced materials. In microwire continuous casting, the main control problem is to maintain the optimum thermal and flow conditions of the process, in order to fabricate the microwire of a given stable diameter. Unlike a conventional casting plant, we propose to use a video camera to take the picture of the molten drop and to control the casting process by means of a knowledge based system. For this reason, a model, that is capable of taking into account the current features of the process and of describing the shape of the drop at each time, is developed. The model presented here should allow us to estimate the geometry of the metal-filled capillary and predict the diameter of microwire at each time during the casting 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.

Numerical Study of Liquid Core Solidification in Influence of Soft Reduction Deformation on Steel Slab Continuous Casting Process

2008 ◽  
Vol 575-578 ◽  
pp. 80-86 ◽  
Author(s):  
J. Luo ◽  
Xin Lin ◽  
Yan Hong Ye ◽  
K.W. Liu
Keyword(s):  
Continuous Casting ◽  
Numerical Study ◽  
Liquid Core ◽  
Solidification Process ◽  
Casting Process ◽  
Reduction Factor ◽  
Two Dimensions ◽  
Temperature Function ◽  
Soft Reduction ◽  
Steel Slab

A two dimensions (2D) multiphase solidification model is used to study the liquid core solidification in the influence of deformation during soft reduction of continuous casting (CC). The transient transport equations (mass, momentum and enthalpy) for each phase of a thin steel slab CC are solved. Four different cases including of density-temperature function and deformation reduction factor on this CC are simulated. The solidification ending point position of liquid core, temperature, velocity and fracture of liquid and solid phases are compared. Understandings to the deformation and liquid core formation mechanism on soft reduction solidification process of CC are improved.

scholarly journals Experimental and Numerical Simulations of the Solidification Process in Continuous Casting of Slab

Metals ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 53 ◽  
Author(s):  
Liang Bai ◽  
Bo Wang ◽  
Honggang Zhong ◽  
Jie Ni ◽  
Qijie Zhai ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Numerical Simulations ◽  
Solidification Process

Effects of Si content on the microstructure and tensile strength of an in situAl/Mg2Si composite

1999 ◽  
Vol 14 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Jian Zhang ◽  
Yu-qing Wang ◽  
Bing Yang ◽  
Ben-lian Zhou
Keyword(s):  
Tensile Strength ◽  
Metal Matrix ◽  
Die Casting ◽  
Solidification Process ◽  
Matrix Composites ◽  
Fracture Characteristics ◽  
Casting Technique ◽  
Si Content ◽  
Strength And Ductility

Al/Mg2Si composites were in situ fabricated by the usual die-casting technique, and effects of the Si contents in the composites on microstructures and tensile strengths were investigated. Experimental results show that extra Si contents in Al/Mg2Si composites induce a ductile matrix and a uniform distribution of in situ particles. The refined microstructures lead to an obvious increase in both strength and ductility of the metal matrix composites (MMCs). The effects of extra Si on both the solidification process and fracture characteristics of the Al/Mg2Si composites were analyzed.

scholarly journals Influence of Alloy Elements on Cracking in the Steel Ingot during Its Solidification

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 836 ◽  
Author(s):  
Junli Guo ◽  
Guanghua Wen
Keyword(s):  
Carbon Content ◽  
Cooling Rate ◽  
Steel Ingot ◽  
Solidification Process ◽  
Solidification Shrinkage ◽  
Liquid Feeding ◽  
Peritectic Solidification ◽  
Longitudinal Cracks ◽  
Cracking Tendency ◽  
Solidification Crack

The average steepness of |dT/d(fs)1/2| on the T − (fs)1/2 curve were calculated during peritectic solidification, which was used to investigate the effect of alloying elements on surface longitudinal cracks of peritectic steels in the solidification process. The value of |dT/d(fs)1/2| indicates the liquid feeding capacity between interdendrites during solidification, where cracks can easily occur if there is poor capacity of liquid feeding, as in peritectic solidification shrinkage. The cracking tendency as a function of carbon content was well described by the |dT/d(fs)1/2| at the cooling rates of 0.5, 5, and 10 °C/s, and the influences of other solute elements on |dT/d(fs)1/2| were also calculated. The results indicate that the possibility of crack occurrence increased and the maximum average steepness |dT/d(fs)1/2| changed from 496.75 °C located near 0.09C wt.% to 622.14 °C near 0.11C wt.% with increasing cooling rate. The value of |dT/d(fs)1/2| on the T − (fs)1/2 curve during the peritectic solidification can be used to analyze the solidification crack for peritectic steels.

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