For a metal alloy, which one of the following descriptions relates to the stress relief annealing process?

Question

For a metal alloy, which one of the following descriptions relates to the stress relief annealing process?

Heating the work piece material above its recrystallization temperature, soaking and then cooling in still air.
Heating the work piece material below its recrystallization temperature, holding for some time and then furnace cooling.
Heating the work piece material up to its recrystallization temperature and then rapid cooling.
Heating the work piece up to its recrystallization temperature and cooling to room temperature alternately for a few cycles.

LohaHridoy

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2025-01-04 04:42

1 Answers

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AhmedNazir · Accepted Answer · 2022-09-04T04:29:57+06:00

Option 2 : Heating the work piece material below its recrystallization temperature, holding for some time and then furnace cooling.

Explanation:

Annealing:

Annealing involves heating the steel to a suitable temperature, holding it at that temperature for some time, and then cooling it slowly.
There are different methods of cooling.
The main purpose of Annealing is to reduce the hardness of a material.
Besides this, it is also used -
- To relieve the internal stress of a material
- To restore ductility to perform the further operation on the material
- To increase the machinability of the material
- To induce softness

There are the following processes in Annealing.

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Diffusion Annealing	In this process, hypo-eutectoid, eutectoid, and hyper-eutectoid steel are heated uniformly and the component is held at a temperature between 1000 °C – 1200 °C and then cooled very slowly in the furnace in order to remove the heterogeneity in the composition of heavy castings. During this, a coarse grain structure produced. A homogenous structure appears. To increase material properties, it goes through full annealing after diffusion annealing.
Full Annealing	Full annealing consists of heating the steel component to about 50 °C – 70 °C above the critical temperature, holding it for a sufficient length of time, and cooling the same in the furnace. Adopted for steel casting and ingots. The coarse structure produced during solidification break down to a much smaller size. Machinability and ductility increases. Hardness is reduced. All structural imperfection gets removed.
Spherodise Annealing	In this method heating can be done in three ways: Prolonged heating just below the lower critical temperature followed by relatively slow cooling Alternately heating and cooling the work-piece to just above and below the lower critical temperature. Short heating at a high temperature followed by relatively slow cooling. Conversion of hard lamellar or network carbides of high-carbon steels into globular or spherical shapes. Improve machinability and ductility.
Process Annealing	This process involves heating of steel to a temperature just below the lower critical temperature (723 °C) of steel. Usually, cold worked steel has high hardness and low ductility making it difficult to work. Deformed grains in cold working get reoriented. Hardness is lowered and ductility also increases.