Hard shot peening
Collisions of the shots which are small and hard balls of steel quickly through the Normal shot peening on the surface after carbonization and induction hardening will enhance the hardness of the parts and fatigue strength.
| Treatment condition |
|---|
Collide the balls of steel on the |
| Metallographic structure |
|---|
|
Retained austenite |
Production mechanism of compressive residual stress
- 1.Retained austenite
- 2.The strain induced transformation by shot projection
- 3.Volume expansion
- 4.Compressive residual stress
Distribution of compressive remaining stress
after shot peening (carbonization parts)
Hard shot peening
Usual shot peening
Without peening / No peening
Effect of compressive residual stress
TSCM620Carburizing + Hard shot peening
SCr420Carbonitriding + Hard shot peening
SCr420Carburizing + Usual shot peening
SCr420Carburizing
Because the tensile stress on the surface can be reduced by high compressive remaining stress occurring from hard shot peening, the effect can see in improving fatigue life.
Equipment
 Hard shot peening machine |
The factroy is able to do
 Kaita Factory 9-9 Tsukimi-machi, Kaita-cho, Aki-gun, Hiroshima-ken, 736-0034, Japan Tel. +81-(0)82-822-2957 Fax. +81-(0)82-822-7294 |
 Hofu Factory 26-1 Shintukiji-cho, Hofu-shi, Yamaguchi-ken, 747-0824, Japan Tel. +81-(0)835-25-3737 Fax. +81-(0)835-25-8626 |