Quiz 5 Flashcards
What is micro-segregation in casting?
Microscopic variations of the concentration of alloying elements in the solid casting
How do we quanitfy turbulence during casting?
By Reynolds number
What is the “spiral mold test”?
A way of measuring the fluidity og a molten metal.
According to Chovrinov’s rule, which of the below parameters does not affect the solidification time?
Turbulence
What is the role of a pattern in expendable mold casting processes?
To make the mold cavity.
Which material is not used in investment casting process?
Plaster
What is the main difference in the appearance of shrinkage and gas porosity?
Gas pores are more round but shrinkage pores are irregular shaped
What is “cold shuts” in castings?
Discontinuities in the cating occuring when flow-fronts meet but fail to join properly
In which of the below casting processes can the metal penetration defects occur?
Sand casting
What is one of the main disadvantages of plaster mold casting (if we aim for high strength cast components)?
Very slow cooling rate.
