We investigated the effect of solute nitrogen on threshold stress intensity factor range, ΔKth, of the growth of small cracks using a water-quenched Fe-0.011N (wt.%) binary alloy, in terms of strain-age hardening. Fatigue tests were carried out for micro-notched specimens at 20°C and 160°C at a frequency of 30 Hz with a stress ratio of –1. The nitrogen effect on ΔKth at room temperature was significant, but smaller than the carbon effect. On the other hand, the thermal stability of the strain aging effect on ΔKth was higher in the Fe-0.011N steel than in Fe-C steels containing supersaturated carbon, because the nitrogen solubility above room temperature is higher than the carbon solubility in ferritic steels.
|寄稿の翻訳タイトル||Thermal Stability of Resistance to Propagation of Mechanically Small Fatigue-cracks in an Fe-N Binary Ferritic Steel|
|ジャーナル||Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan|
|出版ステータス||出版済み - 6 2020|
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