Evaluation of Strip Rolling Directly from the Semi-Solid State

Filho, Antônio de Pádua Lima; Yamasaki, Márcio Iuji

doi:10.4028/www.scientific.net/ssp.116-117.433

Cited by 6 publications

(1 citation statement)

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“…Unlike vertical strip casting processing, it is not necessary here to use a ceramic lateral dam to retain the molten material between the rolls. The single roll and two high-mill processes have been used to produce non-ferrous strip [5] and continuous metal matrix composites [6].…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Deep Drawing and Ironing of Metal Alloy Strip Produced Conventionally and Non-Conventionally via Semi Solid Material Processing

Filho

Yamasaki

Ono

et al. 2008

SSP

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A semi solid thin strip continuous casting process was used to obtain 50%wt Pb/50%wtSn strip by single and twin roll processing at speed of 15 m/min. A 50%wt Pb/50%wtSn plate ingot was also cast for rolling conventionally into strips of 1.4 mm thickness and 45 mm width for comparison with those achieved non-conventionally. This hypoeutectic alloy has a solidification interval and fusion temperature of approximately 31°C and 215°C respectively. The casting alloy temperature was around 280°C as measured by a type K immersion thermocouple prior to pouring into a tundish designed to maintain a constant melt flow on the cooling slope during semi solid material production. A nozzle with a weir ensures that the semi solid material is dragged smoothly by the lower roll, producing strip with minimum contamination of slag/oxide. The temperatures of the cooling slope and the lower roll were also monitored using K type thermocouples. The coiled semi solid strip, which has a thickness of 1.5 mm and 45 mm width, was rolled conventionally in order to obtain 1.2 mm thick strip. The coiled thixorolled strip had a thickness of 1.2 mm and achieved practically the same width as the conventional strips. Blanks of 40 mm diameter were cut from the strips in a mechanical press, ready for deep drawing and ironing for mechanical characterization. All the strips achieved from non-conventional processing had the same mechanical performance as those achieved conventionally. The limiting drawing ratio (LDR) achieved was approximately 2.0 for all strips. Microscopy examination was made in order to observe phase segregation during processing.

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Section: Introductionmentioning

confidence: 99%

A Comparison of Deep Drawing and Ironing of Metal Alloy Strip Produced Conventionally and Non-Conventionally via Semi Solid Material Processing

Filho

Yamasaki

Ono

et al. 2008

SSP

View full text Add to dashboard Cite

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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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Microstructural coarsening of semi-solid aluminium alloys

Atkinson

Liu

2008

Materials Science and Engineering: A

162

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Semisolid metal processing involves processing metallic alloys between the solidus and the liquidus. The microstructure must be non-dendritic and consist of spheroids of solid in a liquid matrix. Two potential routes to suitable starting material are recrystallisation and partial melting (RAP) and cooling slope (CS). Here the microstructural coarsening of such materials in the semi-solid state is compared with rates in the literature.A slightly lower coarsening rate was observed for RAP route 2014 alloy with 37% fraction liquid than for CS route 2014 alloy with 17% fraction liquid despite the higher fraction liquid for the former. For the CS route, an increase in fraction liquid gave a higher coarsening rate.A relatively high coarsening rate was observed in a modified 2014 alloy with the Fe, Mn and Zn stripped out of the composition and a relatively low Si content. The coarsening rate was also relatively high for alloy 201 prepared by the CS route compared with alloy 2014 either by RAP or CS. It is likely that relatively low coarsening rates are associated with the presence of particles which are inhibiting the migration of liquid film grain boundaries, either through a pinning mechanism or through impeding diffusion through the liquid film at the boundary.

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Evaluation of Strip Rolling Directly from the Semi-Solid State

Cited by 6 publications

References 1 publication

A Comparison of Deep Drawing and Ironing of Metal Alloy Strip Produced Conventionally and Non-Conventionally via Semi Solid Material Processing

A Comparison of Deep Drawing and Ironing of Metal Alloy Strip Produced Conventionally and Non-Conventionally via Semi Solid Material Processing

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

Microstructural coarsening of semi-solid aluminium alloys

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