what does annealing mean?

Answer 1

Annealing refers to slowing cooling a material (generally metal), generally to obtain its softest state. Normally, hot metal is either "quenched" by spraying or submerging in water or oil, "normalized" by allowing it to air cool, or "annealed" by slowing the cooling process down even further by leaving it in a furnace where the temperature is gradually reduced.

Steel is a mixture of carbon and iron (and other elements). When heated to red-hot, the crystaline structure changes. By quickly cooling it (quenching) you can catch some of the crystals in their high-temperature configuration, which makes a stronger steel. However, the steel is often brittle as well, so it is usually "tempered" by re-heating it to 500-650 F for a while (half an hour), which allows some crystaline re-arranging which converts some of the brittle strength for toughness.

Annealing is used to get the steel (or other metal) into its softest state, trying to cool it slowly enough to allow practically all of the crystals to transform from their high-temperature state, to the natural room-temperature state. Annealed steels are very flexible and stretchable. Body panels on cars use a lot of annealed steel, because it is easily formed (but also easily dented).

Annealed aluminum is used to stretch a round disk into the typical Coke can - which is a lot of stretching without tearing!

Pepsi actually released an extruded a steel can once, after the technology had developed suficiently to do the same with steel. It was roundly rejected by the public, because they mistakenly took it as "non-recyclable" because the aluminum can business would not take them. If fact, the steel cans were highly and easily recyclable because people did not have to sort them out from the trash, like we do with aluminum. Magnets could pick them out. But because the recycling business was not prepared for them, they were eventually withdrawn from the market.

(My experience is with steel - injanier may be right about aluminum being cooled quickly to obtain its softest state.)

Answer 2

Annealed Meaning

Answer 3

Annealing is a thermal process which removes strain from a material. A metal in the annealed state is at its softest and most ductile. The process involves heating the material above a transition temperature (the austenite or austenite-cementite temperature for steels), and then slowly (rapidly for aluminum and some others) cooling it. Rapid cooling can lock in strains and is used as a hardening process with many materials.

Answer 4

Annealing is a heating process that can apply to all types of material, metal, or semiconductor or insulator alike. It is commonly used in semiconductor industry. Its purposes can be to activate impurities in the substrate or repair crystal damage.

BTW, this is NOT a cooling process. It requires energy to carry out the annealing.

Answer 5

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what does annealing mean?

Answer 6

Full annealing is the process of slowly raising the temperature about 50 ºC (90 ºF) above the Austenitic temperature line A3 or line ACM in the case of Hypoeutectoid steels (steels with < 0.77% Carbon) and 50 ºC (90 ºF) into the Austenite-Cementite region in the case of Hypereutectoid steels (steels with > 0.77% Carbon).

It is held at this temperature for sufficient time for all the material to transform into Austenite or Austenite-Cementite as the case may be. It is then slowly cooled at the rate of about 20 ºC/hr (36 ºF/hr) in a furnace to about 50 ºC (90 ºF) into the Ferrite-Cementite range. At this point, it can be cooled in room temperature air with natural convection.
The grain structure has coarse Pearlite with ferrite or Cementite (depending on whether hypo or hyper eutectoid). The steel becomes soft and ductile.

Answer 7

annealing means as i know it is to get aluminum when its been hardened,is turning it back to it org. soft state.Aluminum can be heat treated to made it into -T-conditions i think it its ti t2 t3 t4-t4 is the strongest state you can make it annealing,brings it back to it org softer condition,this is done by heating it up and plunging it in water then kept on ice.Mainily used in aircraft parts.I hope this is the correct answer.If not U got me.

Answer 8

'Annealing' is the process of toughening an object, by a process of gradually heating and cooling it.

Answer 9

It basically means the removal of internal stress by "tempering"... it's like the repeated pounding of heated steel to bring the molecular composition into alignment for maximum strength. The heating and cooling procees has an inherent capasity for creating internal continuity...

Answer 10

when alloys and metals are affected by mechnical or heat stress, they are heated to some degree , depond on the kind of alloy, and then are cooled slowly