Question

Lubrication at the interface is arises due to the infiltration of mould slag into the gap between the mould and casting.

(a) True

(b) False

I got this question in an online interview.

My question is based upon Solidification with Predominant Resistance in Mould topic in division Cooling and Solidification of Casting-Forming-Welding I

Answer 1

The correct answer is:

(a) True

Explanation:

Lubrication at the interface between the mold and casting can indeed arise due to the infiltration of mold slag into the gap. During the casting process, particularly in processes like continuous casting or steel casting, mold slag can infiltrate the interface between the molten metal and the mold. This infiltration can form a thin layer that acts as a lubricant, reducing friction and improving the mold's ability to release the solidifying casting.

This lubrication effect helps in improving the surface finish of the casting and aids in reducing wear on the mold. It also helps in minimizing defects such as sticking or excessive friction between the casting and the mold during the cooling and solidification process.

Therefore, (a) True is the correct answer.