Tensile properties of precracked tempered martensitic steel specimens tested at ultralow strain rates in high-pressure hydrogen atmosphere

Daisuke Sasaki, Motomichi Koyama, Shigeru Hamada, Hiroshi Noguchi

研究成果: Contribution to journalArticle査読

13 被引用数 (Scopus)

抄録

Tensile tests were performed on precracked Cr-Mo martensitic steel (C: 0.38, Si: 0.22, Mn: 0.84, P: 0.024, S: 0.021, Ni: 0.08, Cr: 1.11, Mo: 0.15, Cu: 0.12, Fe: bal. (wt%)) specimens at various strain rates (ranging from 6.5 × 10-8 s-1 to 1.0 × 10-4 s-1) in high-pressure (95 MPa) hydrogen and helium atmospheres. Irrespective of the strain rate, the tensile strength in the helium atmosphere was 1400 MPa. In the hydrogen atmosphere, the tensile strength decreased to less than 600 MPa at a strain rate of 2.0 × 10-5 s-1. However, the tensile strength increased to 900 MPa when the strain rate was decreased to 6.5 × 10-8 s-1. This recovery of the tensile strength was because of the decrease in the local stress in the vicinity of the precrack because of hydrogen.

本文言語英語
ページ(範囲)260-268
ページ数9
ジャーナルPhilosophical Magazine Letters
95
5
DOI
出版ステータス出版済み - 1 1 2015

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学

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