13Cr系鋼の腐食環境下の低<i>ΔK</i>領域におけるき裂進展挙動

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タイトル別名
  • Crack Growth Behavior in Low <i>ΔK</i> Region in Corrosive Solutions for 13Cr Stainless Steel
  • 13Crケイ コウ ノ フショク カンキョウカ ノ テイ デルタKリョウイキ

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抄録

Corrosion fatigue crack growth tests in low ΔK region in 3%NaCl solution and in distilled water have been carried out on 13Cr stainless steels at various stress ratios (R=-1.0, 0.1, 0.4, 0.8). The effect of frequency on corrosion fatigue crack growth in 3%NaCl solution was also investigated. The results are summarized as follows.<br>(1) The corrosive environment studied here had little effect on crack growth rate in ΔK≥ΔKth (ΔKth: threshold value in air) for R=-1.0 and 0.1, but it slightly increased the crack growth rate for R≥0.4.<br>(2) As critical crack growth rate dropped from (2∼5)×10-10m/cycle in air to (2∼5)×10-11m/cycle in 3%NaCl, ΔKthCF(ΔKthCF: threshold value in corrosive environment) decreased 0.4 times (R=-1.0) to 0.6 times (R=0.1) of ΔKth. ΔKthCF in distilled water was (0.65∼0.70) time (R=-1.0 and R=0.1) of ΔKth.<br>(3) Corrosion pits often occurred at the corrosion fatigue crack tip in the region below da/dN=(2∼8.7)×10-11m/cycle. Therefore, the ΔK value required to reinitiate crack growth from those pits was about 1.5 times higher than that of ΔKthCF.<br>(4) The crack growth law derived previously by considering the effects of waveform and frequency was also found valid as the first approximation for the materials tested.

収録刊行物

  • 材料

    材料 33 (370), 914-920, 1984

    公益社団法人 日本材料学会

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