Y_2O_3とPb粒子分散金属材料の切欠き底における高温疲労微小き裂抑止機能

概要

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An arrest function of fatigue short crack growth from notch root at 200 and 550℃ in air was investigated for Fe-20Cr alloy containing 1.1 weight percent of dispersed Y_2O_3 particles and for SUS403 (Fe-12Cr) and SUS304 (Fe-18Cr-8Ni) stainless steels containing 0.2 weight percent of dispersed Pb particles. The main conclusions obtained are as follows. The fatigue Iimits at the high temperatures were 40〜60% higher for the alloy containing dispersed Y_2O_3 particles and the stainless steels containing dispersed Pb perticles than for their base metals. Above the fatigue limit, the fatigue life was longer for the materials containing dispersed Y_2O_3 or Pb particles than for their base metals, because the growth rate of a fatigue short crack, which was initiated from the notch root, was low. Those improvements in high-temperature fatigue properties were explained, considering that the presence of Y_2O_3 or Pb particles strengthened the oxide film at the notch root or at the crack tip of a short crack. Accordingly, we concluded that Y_2O_3 and Pb dispersed particles show an arrest function of fatigue short crack growth at elevated temperatures.
一般社団法人日本機械学会の論文
1996-08-25