Semi-Solid Rheocasting of Alumina Alloys: Part One

Aluminum is well established at the front of the pack with regards to providing the technological answer to the increasing challenges of light weighting whilst maintaining integrity of the material for the desired applications.
Semi solid rheocasting is a development within the casting sector which enables improved quality in die casting without increasing cost. Continue reading

High Chromium Cast Iron: Part Two

High chromium cast irons (HCCI’s) exhibit very good mechanical properties and offer benefits for a range of manufacturing applications.
One of the main flexibilities exhibited is the possibility of HCCI’s to have different matrix structures in different treatment states whether it be austenite in casting state, pearlite in annealing state, martensite in quenching state, and tempered martensite in tempering state.
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Casting Defects: Hot Tearing

One of the main casting defects is hot tearing or hot cracking, or hot shortness. Irrespective of the name, this phenomenon represents the formation of an irreversible failure (crack) in the still semisolid casting. Although in most works hot tearing is considered as a phenomenon linked to the inadequate compensation of solidification shrinkage by melt flow in the presence of thermal stresses, there are more factors that could be involved in the formation of cracks at supersolidus temperatures.

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The Rheo Casting Process

Defects and anomalies are an everyday challenge within the framework of foundry technologies. As demand for castings with very specialized applications rises, the issue of quality becomes more important.
The Rheo Casting process involves using slurry in a semi solid state with the amount of benefits directly linked to the fraction solid at the time of casting. Advantages can include a reduction in shrinkage and significantly reduced latent heat.
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