How is a metal's hardness reduced?
A) Annealing
B) Forging
C) Re-melting
D) Using a grinder to remove the hard surface

Question

Quizplus · Accepted Answer

Annealing is a process that involves heating a metal to a specific temperature, holding it at that temperature for a period of time, and then gradually cooling it. This process can reduce the hardness of a metal by allowing the internal structure of the metal to rearrange and become more ductile. Forging can work-harden a metal and make it more difficult to shape, re-melting a metal may not necessarily reduce its hardness, and using a grinder to remove the hard surface only removes a thin layer and does not reduce the overall hardness of the metal.

How Is a Metal's Hardness Reduced