Fe-N 二元フェライト鋼における微小疲労き裂進展抵抗の熱的安定性

Translated title of the contribution: Thermal Stability of Resistance to Propagation of Mechanically Small Fatigue-cracks in an Fe-N Binary Ferritic Steel

Motomichi Koyama, Kishan Habib, Tatsuo Yokoi, Eisaku Sakurada, Nobuyuki Yoshimura, Kohsaku Ushioda, Kaneaki Tsuzaki, Hiroshi Noguchi

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Translated title of the contributionThermal Stability of Resistance to Propagation of Mechanically Small Fatigue-cracks in an Fe-N Binary Ferritic Steel
Original languageJapanese
Pages (from-to)130-138
Number of pages9
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume106
Issue number6
DOIs
Publication statusPublished - Jun 2020

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Thermal Stability of Resistance to Propagation of Mechanically Small Fatigue-cracks in an Fe-N Binary Ferritic Steel'. Together they form a unique fingerprint.

Cite this