Heat treatment of metals
Aim: To find out how different heat treatment
Theory and prediction
Metals have various uses in a wide range of industry, where the properties of each metal determine what the metal will be used for. When a metal properties need to be changed to satisfy particular needs, it can be modified by processing the metals with treatments such as cold working and heat treatments.
Structure of metals
Metals are made from their ore, at extremely high temperature. In this form, metals are in a liquid form. The liquid metals are cast by pouring it into moulds where it is cools down and solidifies. When metals are frozen, crystals start forming. These crystals begin to form throughout the metal, where they keep they keep rapidly growing until they reach a neighboring growing crystal structure. These crystals are called grains, where crystals that meet with one another are called grain boundary.
Dislocation are formed when defects are found in the crystal structures. This is often caused by when atoms are missing in a layer, This is shown in figure one.
-250 cm3 of water
-Two blocks of wood
-Marker/felt tip pen
Safety requirement: Eye protection needs to be worn during this procedure