Heat Treatment - Stress Relieving


Stress Relieving consists of heating the steel to a temperature below the critical range to relieve the stresses resulting from cold working, shearing, or gas cutting. It is not intended to alter the microstructure or mechanical properties significantly.also a process for making material softer. However stress relieving does not change the material properties as does annealing and normalizing. A material can be stress relieved by heating it to a specific temperature that is lower than that of annealing or normalizing and letting it cool to room temperature inside or outside of the oven. This heat treatment is typically used on parts that have been severely stressed during fabrication.


It is worth noting that many heat treatments and welding processes cause stresses in the material that can lead to warpage either after the heat treating process or during subsequent machining operations. Of specific concern is the stress induced by welding. If a weldment is to be machined it should almost always be stress relieved or normalized before the machining process. This is because machining chunks of material from a stressed weldment redistributes the internal stresses and can cause the part to warp. If the stresses are first relaxed then abrupt changes in geometry after machining are reduced.


DEFENISION

An annealing process that heats the metal below the austenite phase to reduce distortions or changes in dimensions that might occur after shaping


The controlled heating and cooling processes used to change the structure of a material and alter its physical and mechanical properties.


The heating of a metal at a constant temperature for a suitable duration of time
Normalizing The steady heating of a metal above the recrystallization phase, followed by a cooling process at a moderate pace. Normalized metals are often cooled in open air at room temperature
Annealing The steady heating of a metal at a certain temperature above the recrystallization phase followed by a gradual cooling process
Tempering The steady heating of martensite steel at a temperature below the recrystallization phase, followed by a gradual cooling process.

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