基地組織と黒鉛形状が異なる鋳鉄の高温条件下における疲労強度特性

概要

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This study discusses the effects of the microstructure and the temperature change on the fatigue strength through fatigue tests conducted on six kinds of ferrite and pearlite base cast iron in which the graphite shape is flake, vermicular and spheroidal (hereafter referred to as FC, FCV and FCD, respectively). Four point supported rotating bending fatigue tests were carried out for six kinds of cast iron at room temperature and 400℃ in air. The fatigue limit was shown to be highest in FCD cast iron and lowest in FC cast iron whereas FCV cast iron took the value between the two in rotating bending fatigue test at room temperature. Even if these values changed due to matrix structure, when considering the large difference of tensile strength in the three kinds of graphite shape, the fatigue limit can be accounted as the same relative value. On the other hand, the fatigue limit of each cast iron decreased with the elevation of testing temperature up to 400℃. The fatigue limit of the FCV cast iron having pearlitic matrix at 400℃ was higher than that of the FCD cast iron having same conditions independent of graphite shape. The fatigue limit ratio of ferritic cast irons were higher than those of pearlitic cast irons regarding the matrix structure. This tendency was prominent in fatigue testing result at room temperature.
大阪産業大学の論文
2005-02-28