Annealing - A heat treatment process used to soften metal, typically via slow cooling in a furnace.
Cryogenic treatment - A process used to slightly increase the hardness of an already hardened blade, by cooling to sub zero temperatures. Also results in slight toughness decrease.
Forging - The process of using heat and force to move metal and form it into a particular shape. Traditionally done with a hammer and anvil, however power-hammers and hydraulic presses are also used.
Grinding - The process of using machinery, typically a belt grinder, to apply abrasives to steel, in order to remove material, and refine its shape.
Hardening - Critical part of the heat treating process. The blade is brought to a specific temperature, then rapidly cooled, typically by quenching in oil, to change the steel's molecular structure to a harder form.
Heat treatment - The process of heating and cooling steel at particular rates and temperatures, in order to manipulate its attributes, such as hardness and toughness. Includes, annealing, normalizing, hardening, tempering, cryogenic treatment, and other processes.
Normalizing - Stress relief process for steel, typically after forging. Consists of heating, then cooling the blade in still air repeatedly.
Stabilizing - The process of filling the pores of a piece of wood with resin, in order to strengthen the wood and reduce the potential for shrinkage, warping, and cracking.
Tempering - Final step of heat treatment, done after cryogenic treatment, and or tempering. Increases toughness and reduces brittleness caused by the hardening process.