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Casting Practice Test: Cooling and Solidification
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Cooling and Solidification topics include: Solidification rate and mechanism, large casting solidification in insulating mould, solidification with predominant interface resistance and constant surface temperature, riser placement and residual stress. Casting solidification is the process of transforming a liquid phase into a solid phase. The casting industry uses this process to transform certain materials from a liquid state to a solid state.  In the continuous casting process, liquid metal is poured into a mold with a uniform cross section. The outside of the mold is cooled, and the... Show more
Casting Practice Test: Cooling and Solidification
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25 Questions

1. In continuous casting technology, solidification of casting starts in a thick sand mould of a closed structure.
2. Good thermal conductivity of the solidified metal can lower down the surface temperature below than the freezing temperature.
3. A gap of finite thickness at the interface of mould and metal always increases the heat flux.
4. Increase in mould thickness always decreases the rate of solidification of casting material.
5. It is always desirable to have a large volume of molten metal in the riser to make casting products.
6. Which of the following is independent of the solidification time of the casting?
7. For the complex geometries of the casting, the calculation is more difficult to obtain the air gap at the interface.
8. The solidification time can be increased by increasing the thickness of the mould.
9. The difference in the progress of crystallization at different points in the casting material causes fast and abrupt growth of crystals.
10. Casting which is cooled quickly generally have coarse grain structure.
11. The heat transfer through the interface of metal and mould is always considered as of convection mode.
12. A large size of riser should be placed on the casting system to compensate the solid shrinkage of the casting.
13. Predominant resistance in mould of casting system generally produces castings of brittle nature.
14. As the solidification progresses gradually inwards, small crystals with systematic orientation are formed.
15. Which of the following formulas is given by Chvorinov’s rule for the estimation of total solidification time (ts)?
16. For a single riser in the casting system, the chill should be placed at the ends of the riser.
17. Perfect wetting only occurs when there is no contact resistance phenomenon in the casting interface.
18. Which of the following temperature ranges (in Kelvin) can start the re-melting of droplets of casting material?
19. The presence of chills in the mould does not have any affects on the riser mechanism.
20. Which of the following metal-mould interfaces show the divergent nature of heat flow from the casting material?
21. In the continuous casting line, the solidification or cooling rate is normally very high.
22. In solidification of large casting in an insulating mould, precise calculations are made for the analysis of freezing time of the complex contours of casting.
23. Which of the following is mostly analyzes during the casting and solidification of casting material?
24. To reduce the friction between the mould’s surface and casting, a refractory coating is done to the surface of mould.
25. What should be the value of biot number (Bi) for chill mould castings?