Process analysis of stress relief annealing heat treatment of workpieces using medium frequency induction heating power supply

Castings, welded parts, machined parts, deformed parts, etc. (especially cold deformed parts) often have large residual stress, which significantly increases the stress corrosion tendency of the alloy and reduces the stability of the structure and performance. Therefore, it is necessary to carry out Stress relief annealing, now, many manufacturers use intermediate frequency induction heating power supply to carry out stress relief annealing heat treatment on the workpiece, and the effect is good.

Stress relief annealing is a recovery process. The temperature of stress relief annealing is lower than the starting temperature of recrystallization, and it is slowly cooled after heat preservation. Using intermediate frequency induction heating power supply for stress relief annealing heat treatment, the choice of temperature is very important. If the heating temperature is too low, a longer holding time is required to fully eliminate residual stress and affect production efficiency. If the heating temperature is too high, the strength will drop more. Many, can not guarantee product quality. Stress relief annealing is mainly used for rust-proof aluminum alloys and industrial pure aluminum. The following table lists several stress relief annealing processes for rust-proof aluminum alloys.

In order to meet the needs of the work of the workpiece, the workpiece usually needs to undergo a lot of heat treatment. Among the many heat treatments, stress relief annealing is also very important. This article briefly introduces several stress relief annealing processes for rust-proof aluminum. After many manufacturers adopt the above processes, the workpieces produced are of good quality and meet their working requirements.