Jännityksenpoistohehkutus

Jännityksenpoistohehkutus is a heat treatment process used to reduce residual stresses in a material. Residual stresses are internal stresses that remain in a material after manufacturing processes such as welding, casting, machining, or cold working. These stresses can lead to problems like distortion, cracking, or reduced mechanical properties.

The process involves heating the material to a specific temperature, holding it at that temperature for a defined period, and then cooling it slowly. The heating temperature is typically below the material's recrystallization temperature but high enough to allow for atomic diffusion and stress relaxation. The holding time is crucial for allowing the stresses to dissipate. Slow cooling is essential to prevent the introduction of new residual stresses during the cooling phase.

Jännityksenpoistohehkutus is commonly applied to metals, particularly steel and aluminum alloys. It is a vital step in many manufacturing applications to ensure the dimensional stability and integrity of components. The specific parameters of the process – temperature, time, and cooling rate – are determined by the material type, the magnitude of the residual stresses, and the desired outcome. This treatment helps improve the material's performance and longevity by mitigating the detrimental effects of internal stresses.