Research and Development > JFE TECHNICAL REPORT > No.16 Special Issue on “Engineering,” “Steel Section Products,” and “Iron and Steel Powders” > Molybdenum Hybrid-Alloyed Steel Powder
for High Fatigue Strength Sintered Parts
Using Mesh-Belt Sintering Furnace
No.16 Special Issue on “Engineering,” “Steel Section Products,” and “Iron and Steel Powders”
Molybdenum Hybrid-Alloyed Steel Powder for High Fatigue Strength Sintered Parts Using Mesh-Belt Sintering Furnace
UNAMI Shigeru OZAKI Yukiko
Abstract
The fatigue strength of the sintered and carburized compact made of the Mo hybrid-alloyed steel powder, which is based on a 0.6 mass% Mo prealloyed steel powder to which 0.2 mass% Mo powder particles have been diffusion bonded, is higher than that of the 0.6 mass% Mo prealloyed steel powder. The sintered compact made of the Mo hybrid-alloyed steel powder has a finer pore structure than that of the Mo prealloyed steel powder, because the Mo-rich region near the surface of the Mo hybrid-alloyed steel powder should exist as the a-iron phase with a high diffusion coefficient at high temperature and result in enhanced sintering. Improvement in the fatigue strength of the sintered and carburized compact made of the Mo hybrid-alloyed steel powder should result from not only the fine pore structure but also the strengthening of the sintering neck by Mo concentration around pores.
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