焼入れ工程を不要とした高強度焼結ギヤの開発 [in Japanese] Development of high strength P/M gear without quenching process [in Japanese]
Access this Article
Search this Article
Sintered materials have been widely used in various industrial fields duo to the improvement of their mechanical properties. However, the demands for reduction of production cost of sintered parts are growing in recent years. In this study, a material, which has martensitic structure obtained at a current cooling rate in conventional furnace without quenching process, has been developed in the purpose of lowering production cost. In order to obtain such a material, it is necessary to improve the hardenability of material through adding alloying elements. The alloying elements and their addition method were optimized to get a good compressibility. The amount of alloying elements was decided by the calculation of ideal critical diameter. As a result, the developed material consisted of 95% martensite and 5% bainite structure at a cooling rate of 0.15K/s, and its mechanical properties are far superior to those of the conventional materials having been heat-treated. Based on these results, the developed material has been evaluated for its practical use as the spiral bevel gear for power tool.
- J. Jpn. Soc. Powder Powder Metallurgy
J. Jpn. Soc. Powder Powder Metallurgy 45(5), 459-463, 1998-05-15
Japan Society of Powder and Powder Metallurgy