Stress relieving is intended to remove internal residual stresses generated by prior manufacturing processes such as casting, machining, cold work and welding.It is normally restricted to relatively low temperatures and carried out to keep changes in material structures and material properties to a minimum. Without stress relief, subsequent processing may give rise to unacceptable distortion, cracking and associated service problems.
Stress relieving can be applied to both ferrous and non-ferrous alloys as well as some non-metallic materials.
Stress relieving can fall into two temperature categories:-
- 560°C to 650°C provides a virtually complete stress relieve from machining, welding etc.
- 150°C to 250°C relives peak stresses normally introduced after hardening without significantly reducing base hardness.
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