材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
球状黒鉛鋳鉄の高温における軸荷重下での疲労強度
古郷 佐八郎荻野 春之助中川 隆小林 正孝浅見 克敏
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1986 年 35 巻 393 号 p. 617-622

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Pulsating tension fatigue tests (R=0.1) and statical tension tests at room temperature to 500°C were performed on the as-cast and heat-treated materials of spheroidal graphite cast iron. The macro and microscopic observations of the fatigue-fracture surface of the specimens were carried out by SEM to interpret fatigue strength data.
The results obtained are summarized as follows:
(1) The tensile strength at elevated-temperatures decreased with the elevation of testing temperature. However, the effect of normalizing and austempering heat-treatment was remarkably noticed.
(2) The fatigue strength decreased with the elevation of testing temperature, which is the same as the tensile strength, but the effect of heat-treatment was noticed very slightly. The fatigue limit at 500°C for the bainitized material was σu=92MPa and for the annealed material σu=77MPa.
(3) Fatigue cracks appeared from internal defects such as small pinholes. Therefore, it is considered that the heat-treatment does not affect the fatigue strength so much.

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