Yellow-is the most visible color and is the first color the human eye notices! Yellow, the color nearest to light leaves a warm and satisfying impression, lively and stimulating and in many cultures symbolizes deity.
Quench C hardening is a mechanical process in which steel and cast iron alloys are strengthened and hardened. These metals consist of ferrous metals and alloys. This is done by heating the material to a certain temperature, depending on the material.uench metals is a progression; the first step is heating, i.e. heating it to the required temperature. Second step is soaking. Soaking can be done by air (air furnace), or a bath or in a vacuum. The soaking time in air furnaces should be 1 to 2 minutes for each millimeter of cross-section.
This means that each atom will take up more space due to it's movement so the material will expand. When it is cold the kinetic energy decreases, so the atoms take up less space and the material contracts. Some metals expand more than others due to differences in the forces between the atoms / molecules.In metals such as iron the forces between the atoms are stronger so it is more difficult for the atoms to move around. In brass the forces are a little weaker so the atoms are free to move about more.ome metals expand more than others due to differences in the forces between the atoms / molecules. In metals such as iron the forces between the atoms are stronger so it is more difficult for the atoms to move around. In brass the forces are a little weaker so the atoms are free to move about more.