SUP10ばね鋼の諸特性に及ぼすFPB処理の影響

抄録

The FPB (Fine Particle Bombarding) process attracts attention as a new surface-preparation technique. The influence of surface modification by the FPB process on various characteristics of SUP10 was investigated. The surface roughness of FPB treatment materials decreased more than shot peening treatment materials. As a result of comparing the shot time of FPB process, it proved that surface roughness increased as the shot time became long. On every projection conditions of FPB process, the hardness near the surface rose higher than the shot-peening. Hardness was the maximum at the time of shot time 20 seconds, and residual stress was the maximum at the time of 5 seconds. The maximum compressive residual stress was a value equivalent to a shot-peening process. The fatigue strength of the FPB material rose than shot-peening material by low surface roughness and high surface hardness. These results showed that a FPB process was effective in the improvement in fatigue strength of spring steel.