Term
| Columnar grain structure has |
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Definition
| Only grains with parallel grain boundaries. |
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Term
| Continuous casting produces |
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Definition
| A semi-finished shape such as a plate which is continuously withdrawn as additional liquid metal is added to the mold. |
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Term
| Which of the following is a factor of the cooling rate in the fusion zone? |
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Definition
| Increased thickness of the metal, Smaller fusion zones, Low original metal temperatures |
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Term
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Definition
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Term
| Equiaxed grain structure has |
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Definition
| Grains with grain boundaries in random directions. |
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Term
| Which of the following has the highest heat intensity? |
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Definition
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Term
| Increased undercooling will _____ the solidification rate. |
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Definition
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Term
| In dendritic growth, the _____ absorbs the latent heat of fusion. |
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Definition
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Term
| Industry uses the solidification processes as a _____ processing step to produce metallic slabs or ingots. |
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Definition
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Term
| In general, _____ nucleation requires less undercooling than _____ nucleation. |
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Definition
| Heterogeneous; homogeneous |
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Term
| In ingot casting produces |
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Definition
| Large castings which are processed into useful shapes via thermomechanical processing. |
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Term
| In order for an embryo to become stable, it must overcome the... |
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Definition
| Surface energy of the newly created surface |
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Term
| In the initial stage of solidification, small _____ begin to form |
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Definition
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Term
| Planar growth occurs by the movement of a _____ into the liquid. |
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Definition
| Smooth solid-liquid interface |
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Term
| A seed, in relation to the reading, is a |
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Definition
| Small crystal of predetermined orientation used to control single crystal growth. |
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Term
| Single crystal structure has |
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Definition
| Only one continuous grain. |
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Term
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Definition
| Has a melting temperature below 450C. |
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Term
| Solidification is driven by the... |
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Definition
| Minimization of free energy |
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Term
| The _____ is unstable and may either grow into a stable nucleus or dissolve. |
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Definition
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Term
| Which of the following is not an application of controlled nucleation? |
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Definition
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Term
| According to Chvorinov’s rule and the same conditions, a casting with a _____ volume and _____ surface area will cool more rapidly. |
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Definition
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Term
| What casting process is good for making complex shapes? |
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Definition
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Term
| The cast structure’s equiaxed zone has new, randomly oriented grains caused by which of the following: |
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Definition
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Term
| How can we minimize gas porosity in castings? |
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Definition
| Adding materials to the liquid to combine with the gas and boiling it, Ensuring that the partial pressure of the gas remains low |
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Term
| In a cooling curve, what is recalescence? |
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Definition
| The increase in temperature of the undercooled liquid due to nucleation |
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Term
| What can be used to compensate for shrinkage? |
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Definition
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Term
| Zinc, aluminum, and magnesium-based alloys are often processed using what type of casting? |
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Definition
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