Reducing residual stress: Stress-relief annealing
Some materials have residual stress which can change the dimensions and the shape of the component, increase its sensitivity to cracks and impair its fatigue strength. In order to prevent this, the stress-relief annealing technique is used.
At temperatures between 842 °F and 1202 °F, the residual stress of the component is greatly reduced. The microstructure is not changed during this process. During stress-relief annealing, the dimensions and the shape of the annealed material change to a certain degree. These changes are handled again after the process.