Abstract
Vacuum carburizing material of SCM420H was treated by shot peening process using shot particles of Haig speed steel, amorphous and cast steel. 4 point fatigue test of these specimen were performed until 10^6 cycles. After shot peening treatment, residual stress, surface roughness and surface hardness of specimen were measured and cross section of them were observed respectively. From these experimental results, the fatigue strength in the case of using amorphous was the highest value.
