Abstract
The fatigue properties of 304L stainless steel specimens made from gas atomized powder and water atomized powder were investigated by metal injection molding. The fatigue test was carried out under the tension-tension cyclic loading. The fatigue strength of gas atomized compact was higher than that of water atomized one. The fracture surfaces of gas atomized compact was much rougher than those of water atomized compact. Fatigue fracture regions and static fracture regions were clearly observed for the gas atomized compact, however, the fatigue fracture region could not be obviously appeared on the case of the water atomized compact. It was observed that these surface fatigue cracks were initiated from around voids and were propagated with combinations of cracks.
