Manufacturing of gears using wrought alloy steel is expensive because of large number of processes involved. P/M components, allow manufacturing near-net-shaped products via more simple processes. However, the mechanical properties of conventional P/M materials are inferior to those of wrought materials. In this study, we developed a liquid-phase sintered material made of Fe-Ni-Mo-P pre-alloyed powder. The developed material has approximately 35% higher contact fatigue strength than conventional P/M material. The liquid-phase sintered body made of Fe-Ni-Mo-P pre-alloyed powder has not only high density, but also finer pore structure than that of the mixed powder of Fe-Ni-Mo and Fe-P. In-situ observation confirmed that homogeneous liquid-phase formation of the pre-alloyed powder during sintering is responsible for the pore structure of the sintered body. By performing a stress analysis of the pore structure, we clarified that this fine pore structure is effective for improving fatigue strength.
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机译：使用锻造合金钢的齿轮制造是昂贵的，因为涉及大量工艺。 P / M组件，允许通过更简单的工艺制造近净形产品。然而，常规P / M材料的机械性能差不等于锻造材料。在这项研究中，我们开发了由Fe-Ni-Mo-P预合金粉末制成的液相烧结材料。开发材料比常规P / M材料具有大约35％的接触疲劳强度。由Fe-Ni-Mo-P预合金粉末制成的液相烧结体不仅具有高密度，而且比Fe-Ni-Mo和Fe-p的混合粉末更细的孔结构。原位观察证实，烧结期间预合金粉末的均匀液相形成是烧结体的孔结构的原因。通过对孔隙结构进行应力分析，阐明了这种细孔结构对于提高疲劳强度是有效的。
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