Question

In casting, to promote / provide unidirectional solidification which of the following are used?

• A. Cores
• B. Patterns
• C. Chills
• D. Chaplets

Hint:

To promote unidirectional solidification in casting, use chills to locally increase cooling rates and guide the solidification front effectively.

Answer 1

The Correct Option is C

Chills are heat-conducting materials (typically metal) placed in the mold cavity to accelerate the solidification rate of molten metal in specific regions. Their primary function is to promote unidirectional solidification by quickly extracting heat from critical areas, which helps in: - Avoiding shrinkage defects - Directing the solidification front towards the riser - Ensuring better grain structure and sound casting Chills can be either internal (embedded) or external (placed against the mold wall).