To soften & relieve strains in any solid material, such as metal or glass, by heating to just below its melting point & then slowly cooling it. Annealing generally lowers the tensile strength of the material, while improving its flex life & flexibility.
To heat metal in order to lower its hardness. The term anneal refers to the heat treatment given to 300 series stainless and most 400 series stainless by the steel mill after the raw material has been completed, but before fittings are manufactured. Anneal also refers to the heat treatment given 400 series stainless fittings after their manufacture (also called hardening and tempering) to lower hardness and increase toughness. For example, fittings of 410 stainless may score over 200,000 psi after manufacture and be too brittle. By annealing at 1000 degrees F., tensile strength would reduce to 125,000-150,000 psi, while annealing the same material to 500 degrees F. would bring tensile to 160,000-190,000 psi.
To anneal is simply to heat in an oven at a certain rate and then cool again. The polymer films in this study were annealed at 523 K (300 degrees F, a typical temperature for a kitchen oven) heated at 5 K/minute and cooled at 2 K/min.
Alternate spelling - anueal. The process of softening metal. For ferrous metals containing iron, the process involves heating the steel up to its critical temperature and then slowly cooling it. For non-ferrous metals such as brass, bronze, silver, gold, and aluminum, the process is modified. The metal is heated to its critical temperature and then quickly quenched in water, snow, urine, or oil. What annealing actually does on a molecular level is to allow the metal crystals to realign, moving them into their more relaxed state. When the metal is worked, the crystals are moved out of alignment, contributing to both hardness and brittleness. When producing arms and armour the metal must be annealed as it is worked; if not, the metal can become stressed to the point where it will break.
Metal is annealed by heating to make it workable. In the making of jewelry, precious metals become work hardened or stressed when they are hammered, forged, rolled or bent (as in fold forming) making it brittle. Jewelers sometime purchase metals in their annealed state which may be referred to as soft or half hard.
A heating enhancement process used with color gemstones. The term originated with the Independent Gemological Laboratories (IGL), an industry leader in diamond grading specializing in larger stones. Also, a heating process to soften precious metals.
To heat metal, glass or other materials above the critical or recrystallisation temperature, then cool it to eliminate the effects of colour working, relieve internal stresses or improve electrical, magnetic or other properties.
The process of reducing the hardness and increasing the ductility of metal parts by heat treatment. Steel, stainless steel and brass blind threaded inserts are typically annealed to reduce the upset or installation load required and to reduce the risk of fracture at the outer perimeter of the bulb.
To cool glass by reintroducing a completed object into an auxiliary part of the glass furnace and slowly cooling the object so that any strain created in the glass during the forming process may be released. The critical area for cooling is 1000-800 degrees.
A heat-treating process in which the steel is heated to some elevated temperature, usually at or near the critical range and held at this temperature for a period of time, then cooled, usually at a slow rate. Annealing is employed (1) to soften steel for secondary machining or forming processes; (2) to alter ductility, toughness, electrical or magnetic characteristics or other physical properties; (3) to refine the crystal structure; (4) to produce grain reorientation; or (5) to relieve stresses and hardness resulting from weaving (cold working).
A process, consisting of heating to and holding at a suitable temperature followed by cooling at a suitable rate, used primarily to soften metallic materials, such as steel. This process also simultaneously produces desired changes in microstructure, as in other properties, such as improvement of mechanical or electrical properties, increase in stability in dimensions, facilitation of cold work, and more. See batch anneal.