浸炭歯車用鋼の衝撃強さに及ぼす合金元素の影響

概要

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Effects of alloying elements on the impact strength of carburizing gear steels were studied by using gear impact testing apparatus. One set of gears was impact-loaded by instrumented striker and the maximum load was defined as the impact strength. It was shown that the impact strength of carburized gear increased with Ni and Mo contents and decreased with Si, Mn and Cr. The same result was obtained in Charpy impact testing using carburized specimens. The impact load and the Charpy impact energy were proportional to alloying elements parameter: (Ni+Mo)/(10Si+Mn+Cr). The effects of alloying elements on the impact properties of carburized gears are more prominent in carburized case than in core, and the effects are exhibited through intergranular oxidation depth, intergranular strength, retained austenite content and so forth.
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