球状黒鉛鋳鉄の高温疲労強度について

概要

論文の詳細を見る
The rotating bending fatigue tests were perfomed on the specimens of nodular cast iron with unnotch, semicircular notch and 60°V-notch at room temperature, 150℃, 300℃, 400℃, 550℃, and 800℃ with the frequency of 3600 rpm. Their values of fatigue strength were obtained at 10^7 cycles. The results are as follows: (1) The fatigue strength of the unnotched specimen decreases with the rising test temperatures, At about 400℃, however, the fatigue strength takes the slightly high value due to the blue brittleness. Beyond the range of 500℃, the fatigue strength decreases rapidly. (2) The fatigue strength of the notched specimens decreases with the rising test temperatures. At about 300℃to 400℃, however, the fatigue strength shows a near constant value. Beyond 400℃, the fatigue strength decreases rapidly. (3) The value of fatigue notch factor gradually increases with the elevating temperatures above room temperature and then increases rapidly beyond about 400℃ to 500℃.
社団法人日本材料学会の論文
1974-08-15