Steel
This is the most commonly used metal when it comes to heat treatment. The carbon content in it can be adjusted to change how hard or tough it becomes. Different heating and cooling methods can be used to change its structure.
Aluminum Alloys
When applying heat treatment to aluminum, the process can be quite tricky. Since it melts at a lower temperature than steel, the heat needs to be controlled carefully. Aluminum is mostly hardened through precipitation hardening, which improves its strength.
Copper, Titanium, and Other Alloys
Other metals and alloys can also be heat-treated. Copper is usually softened through annealing, while some other copper alloys can be hardened. When heat treating titanium alloys, it needs to be done with care because they react with oxygen when hot.
