カーボニル焼結鉄の疲労強さと疲労過程に現われる粒界破壊

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  • Fatigue Strength of Carbonyl Sintered Iron and Intergranular Fracture in Fatigue Test
  • カーボニル ショウケツ テツ ノ ヒロウ ツヨサ ト ヒロウ カテイ ニ アラ

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The fatigue strength of carbonyl iron compacts sintered at a temperature in the ferrite and austenite ranges and the intergranular fracture observed in the fatigue test were investigated.<BR>The results are as follows:<BR>(1) At the same compacting pressure, the fatigue strength of carbonyl iron compacts sintered for 3.6 ks in the temperature range between 1073 K and 1423 K is higher in ferrite and lower in austenite field.<BR>The endurance limit ratio obtained is in the range between 0.41 and 0.47.<BR>(2) The fatigue strength of specimens sintered isothermally at 1123 K and 1423 K increases gradually with the increase in the sintering time, except that of specimen sintered for 172.8 ks at 1123 K remarkably decreases.<BR>(3) The mode of fatigue fractured surface for specimens sintered at 1123 K is a mixed trans- and intergranular fracture type, while that for specimens sintered at 1423 K is mainly a trans-granular fracture type.<BR>The degree of intergranular fracture increases with the increase in the sintering time at 1123 K and with the decrease in carbon content.

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