回転曲げをうけるSNCM8のき裂進展挙動に及ぼす雰囲気の影響

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The influence of corrosive environments on the fatigue crack growth rate of SNCM8 was investigated. The material used was tempered at 200℃ to give a yield strength level of 150 kgf/mm^2 . Tests were made at stress intensity levels below K_<ISCC> m room air, distilled water and 3. 5%NaCl solution. Since the formula of stress intensity was unknown, the data were analyzed by using the stress intensity of an infinite cracked plate with uniform stress at infinity. Moreover, in order to consider the effect of hydrogen on this material, hydrogen-precharged specimens were tested in the same environments. The results obtained are as follows : (1) The fatigue crack growth rate in corrosive environments was 3-5 times faster than that in room air. However, it is considered that the growth rate in room air is accelerated by water vapor in air. The growth rate at lower stress intensity in 3. 5%NaCl was a little faster than that in distilled water. (2) Independent of the stress level during precracking and corrosive fatigue stressing, the growth rate was represented well by the formula above-mentioned. (3) Precharged hydrogen accelerated the fatigue crack growth. This effect was remarkable for precracked specimens and in room air. (4) Fracture surfaces have both striation-like pattern and intergranular facet pattern in the above environments. In corrosive environments intergranular facet pattern increased. These results suggest the occurrence of hydrogen embrittlement.
社団法人日本材料学会の論文
1981-06-15

回転曲げをうけるSNCM8のき裂進展挙動に及ぼす雰囲気の影響

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