ステンレス鋼SUS630のギガサイクル疲労特性

抄録

Gigacycle fatigue tests were conducted at 100Hz for three years and at 20kHz for one week on heats A and B of SUS630 stainless steels. 480°C (H900) and 580°C (H1075) aging samples were prepared. In the gigacycle fatigue tests, almost all specimens showed internal fracture in case of H900, while H1075 showed surface and internal fractures in short and long life regions, respectively. In the gigacycle fatigue properties, although the heat A revealed higher fatigue strength than the heat B, the difference was small between the H900 and H1075. The gigacycle fatigue strength of the present materials was lower than that of other high-strength steel in spite of almost equal inclusion sizes.