Billetless simple thixoforming process

Haga, Toshio; Kapranos, P.

doi:10.1016/s0924-0136(02)00817-8

Cited by 73 publications

(69 citation statements)

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“…The results for the effects of the thermal properties of the mould, the melt superheat, the effect of heating the mould and the casting without a cooling slope are consistent with those of previous workers [13,29,30].…”

Section: Discussionsupporting

confidence: 90%

“…This is not what was found in this work but these results are in contradiction with results from other authors. Haga [17] and Haga and co-authors [28,29] show results where the length of contact with the cooling slope does affect the ingot microstructure, although the effect was not quantified. Haga and co-authors used a cooling slope and cooling lengths very similar to that in the current work, including the use of the boron nitride coating for lubrication.…”

Section: Discussionmentioning

confidence: 99%

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Cooling slope casting to obtain thixotropic feedstock II: observations with A356 alloy

2008

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New Rheocasting (the NRC process) is a recently developed semisolid processing route. There are two versions of this route. In one, molten alloy is poured directly into a mould and through careful temperature control during cooling a spheroidal semisolid microstructure is achieved, before the material in the mould is upended into a shot sleeve and hence forced into a die. Alternatively, the molten alloy is poured onto a cooling slope and thence into a mould before processing. The aim of the work described in this paper, and its companion, was to develop understanding of the microstructural development during the initial stages of this process i.e. in the mould before processing and with the cooling slope/mould combination. In the previous paper, an analogue system based on aqueous ammonium chloride has been used to visualise what happens when an alloy is poured into a tilted mould with a chill wall, which acts to mimic the mould and the cooling slope in the NRC process. In this companion paper, the results for pouring A356 aluminium alloy directly into a mould, and also via a cooling slope into a mould, are presented.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Cooling slope casting to obtain thixotropic feedstock II: observations with A356 alloy

2008

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“…9,10) Specially prepared semi-solid slurry having near spherical primary solid particles plays a pivotal role towards the success story of SSM. [11][12][13] There are several variants of semisolid forming processes, reported in archived literature such as thixocasting, rheocasting, rheomoulding, and thixomoulding. All the above methods require prior semisolid slurry preparation.…”

Section: Introductionmentioning

confidence: 99%

“…Several researchers worldwide have worked on different slurry generation techniques such as electromagnetic stirring, stress-induced and melt-activated (SIMA) process, Magneto Hydrodynamic Stirring (MHD), cooling slope, vibration, and so on. [11][12][13][14][15] A380 is a Al-Si-Mg-Cu alloy which is used potentially for die casting applications. Several different components of automotive industry such as brake drum, brackets, manifolds, valve bodies, air cooled cylindrical heads and gear cases are being manufactured using this alloy at present.…”

Section: Introductionmentioning

confidence: 99%

Phase Field Simulation of Equiaxed Microstructure Formation during Semi-solid Processing of A380 Al Alloy

et al. 2014

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A phase field modelling approach is implemented in the present study towards simulation of microstructure evolution during cooling slope semi solid slurry generation process of A380 Aluminium alloy. First, experiments are performed to evaluate the number of seeds required within the simulation domain to simulate near spherical microstructure formation, occurs during cooling slope processing of the melt. Subsequently, microstructure evolution is studied employing a phase field method. Simulations are performed to understand the effect of cooling rate on the slurry microstructure. Encouraging results are obtained from the simulation studies which are validated by experimental observations. The results obtained from mesoscopic phase field simulations are grain size, grain density, degree of sphericity of the evolving primary Al phase and the amount of solid fraction present within the slurry at different time frames. Effect of grain refinement also has been studied with an aim of improving the slurry microstructure further. Insight into the process has been obtained from the numerical findings, which are found to be useful for process control.

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“…Solid nucleuses are formed because of the contact between the melt and the slope plate, detached from the surface as a result of applied shear due to gravity force and melting flow. In CS method, various parameters such as superheat temperature, plate length and angle, material and die temperature and reheated can affect the final microstructure (Haga & Kapranos, 2002;Haga & Suzuki, 2001). A360 aluminum alloy exhibits many profits such as wear resistance, good weld capability, and high strength to weight ratio and excellent casting capability.…”

mentioning

confidence: 99%

Effect of angle, length and circulation cooling system on microstructure A360 Aluminum alloy in semi-solid metal forming by cooling slope method

Kaykha¹

2017

10.5267/j.esm

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Application of cooling slope in casting is a relatively simple process with low equipment and processing costs, which is able to produce semi-solid slurries with different parameters such as pouring temperature, length and angle of slope plate, and plate type. In this study, the effect of angle and length of copper made slope plate on the microstructure of A360-Aluminum alloy is investigated. Microstructure study of metallographic samples in different conditions revealed that for 400mm slope length and 60° slope angle the optimum sphierized and homogenized microstructure is achieved. Also, under these conditions, the most hardness (77HB) was obtained, which might be because of suitable solidification conditions namely time and rate of shear stress. After finding the suitable conditions of slope length and angle, the effect of the circulation cooling system was examined; and the method with cooling system was found to result in more homogenized microstructure compared to ordinary method.

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Billetless simple thixoforming process

Cited by 73 publications

References 1 publication

Cooling slope casting to obtain thixotropic feedstock II: observations with A356 alloy

Cooling slope casting to obtain thixotropic feedstock II: observations with A356 alloy

Phase Field Simulation of Equiaxed Microstructure Formation during Semi-solid Processing of A380 Al Alloy

Effect of angle, length and circulation cooling system on microstructure A360 Aluminum alloy in semi-solid metal forming by cooling slope method

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