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Electromagnetic refining of aluminum alloys by the CREM process: Part II. Specific practical problems and their solutions
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In this paper, the main characteristics of this new technology are the elimination of the need for grain-refiner master alloys and a marked reduction of the scalping operation, and the three-dimensional aspect of the electromagnetic and fluid flow phenomena, the effect of the electrical conductivity of the ingot mold and the improvement of the process design are examined.Abstract:
An experimental investigation, described in Part I and bearing on aluminum alloy billets produced by the CREM process, has shown that the main characteristics of this new technology are the elimination of the need for grain-refiner master alloys and a marked reduction of the scalping operation. Part II reports on the examination of the problems specific to the CREM process, which occur particularly during slab casting. The three-dimensional (3-D) aspect of the electromagnetic and fluid flow phenomena, the effect of the electrical conductivity of the ingot mold, and the improvement of the process design are examined.read more
Citations
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Journal ArticleDOI
Effects of forced electromagnetic vibrations during the solidification of aluminum alloys: Part I. solidification in the presence of crossed alternating electric fields and stationary magnetic fields
TL;DR: In this article, a magnetohydrodynamic method of transmitting forced vibrations to solidifying aluminum alloy melts has been developed, which can reveal the specific effects of the oscillatory flow and of the cavitation phenomena on grain refinement.
Journal ArticleDOI
Effects of low-frequency electromagnetic field on microstructures and macrosegregation of continuous casting 7075 aluminum alloy
B. Zhang,Jianzhong Cui,Guimin Lu +2 more
TL;DR: In this article, the influence of low-frequency electromagnetic field on microstructures and macrosegregation in continuous casting process was investigated experimentally and a fine equiaxed as-cast structure was obtained when frequency reaches 15 Hz, while a proper frequency (30 Hz in this study) can inhibit the macrose segregation to the best effect.
Journal ArticleDOI
Grain Refinement of Alloys in Fusion-Based Additive Manufacturing Processes
Duyao Zhang,Arvind Prasad,Michael Bermingham,C. J. Todaro,Michael J. Benoit,Mitesh N. Patel,Dong Qiu,David H. StJohn,Ma Qian,Mark Alan Easton +9 more
TL;DR: In this article, the authors explain the reason for columnar grain structures in terms of the high thermal gradients typically observed during solidification and the alloy compositions that are typically used which promote epitaxial growth.
Journal ArticleDOI
Coupled modeling of electromagnetic field, fluid flow, heat transfer and solidification during low frequency electromagnetic casting of 7XXX aluminum alloys: Part 1: Development of a mathematical model and comparison with experimental results
TL;DR: In this paper, a comprehensive mathematical model has been developed to describe the interaction of the multiple physics fields during the conventional DC casting and low frequency electromagnetic casting (LFEC) process.
Journal ArticleDOI
Effects of forced electromagnetic vibrations during the solidification of aluminum alloys : Part II. Solidification in the presence of colinear variable and stationary magnetic fields
TL;DR: In this article, the influence on grain refinement of electromagnetic vibrations imposed during solidification of various aluminum alloys has been examined, without any material contact with the solidifying alloys, by the simultaneous application of a stationary magnetic fieldB 0 and a periodic magnetic fieldb(t) of 50 Hz frequency.
References
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Journal ArticleDOI
Electromagnetic refining of aluminum alloys by the CREM process: Part I. Working principle and metallurgical results
TL;DR: In this paper, the working principle of a new electromagnetic continuous casting process is described and the evolution of both the grain size and the thickness of the segregated surface layer with the electric power input is presented.
Journal ArticleDOI
Rotational electromagnetic stirring in continuous casting of round strands
TL;DR: In this article, a model is presented to compute the three-dimensional flow field in rotational electromagnetic stirring of round strands, which involves the solution of the Maxwell equations, the Navier-Stokes equations, and the transport equations for the turbulence characteristics.
Journal ArticleDOI
Experimental study of continuous electromagnetic casting of aluminum alloys
Ch. Vivès,R. Ricou +1 more
TL;DR: In this article, a summary of the characteristics of electromagnetic casting and the present knowledge of the subject is presented, and the use of new local measurement techniques for velocity, magnetic field, current density, and phase difference, which allow experimental investigation of the flow of molten metal in industrial equipment (up to 700 °C) in the presence or absence of an induction magnetic field.
Journal ArticleDOI
Electromagnetic and fluid flow phenomena in a mercury model system of the electromagnetic casting of aluminum
TL;DR: In this paper, a mathematical formulation has been developed to represent the electromagnetic force field and the velocity field in the melt for the electromagnetic casting of aluminum, and the theoretical predictions based on fundamental considerations are compared with experimental measurements obtained on a physical model system.
Journal ArticleDOI
An Analysis of an Electromagnetic Mold for the Continuous Casting of Nonferrous Metals
TL;DR: In this paper, the effect of the field shaping short-circuited turn (screen) on the field strength, pressure and force factors was examined using a one-dimensional field model and a two-dimensional semi-infinite model.
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