16:30 〜 16:50
[14A-T2-08] Effect of Homogeneity in Sintered Material’s Microstructure on Fatigue Strength
キーワード：Powder metallurgy, Sintered steel, Homogeneity, Fatigue strength
Sintered parts can be mass-produced with high precision and cost-effectiveness, and have a wide range of applications, including in automobiles. Since conventional sintered materials tend to show smaller fatigue strength than that of wrought steel, they cannot be applied to high load applications.The effect of homogeneity in the microstructure of sintered materials on fatigue strength has been investigated in many studies. In this paper, we compare fatigue strength between homogeneous and heterogeneous materials. Our study reveals that in a high-density range of about 7.7 g/cm3, cracks occur at the surface starting point, and homogeneous materials have a fatigue limit 10 times that of heterogeneous materials.