Relationship between microstructure and hydrogen absorption behavior in a V-bearing high strength steel

Takehiro Tsuchida, Toru Hara, Kaneaki Tsuzaki

研究成果: Contribution to journalArticle査読

67 被引用数 (Scopus)

抄録

Hydrogen thermal desorption analysis and TEM observation were performed to understand the relationship between microstructure and hydrogen absorption behavior in a V-bearing steel (0.4C-1.0Cr-0.7Mo-0.35V; mass%). The hydrogen absorption behavior was changed by controlling (V,X)C precipitation with change of tempering temperature from 300 to 700°C. Hydrogen was absorbed into the specimen by cathodic charging at a constant condition, and its content was examined by thermal desorption analysis. Energy-filtering and high-resolution TEM methods were employed to observe the size and distribution of (V,X)C precipitates. When the specimen was tempered at around 600°C, the absorbed hydrogen content was markedly increased; 3 times higher than that of the as-quenched specimen. TEM observation showed that this significant hydrogen absorption was attributed to nano-scale (V,X)C coherent precipitates. When the specimen was tempered at 700°C, the absorbed hydrogen content was decreased but was still as high as that of the as-quenched specimen. This was due to spherical (V,X)C incoherent precipitates with about 20 nm in diameter. It was estimated from hydrogen desorption profiles that activation energy of hydrogen evolution from trapping sites for the fine coherent precipitates was similar to that for dislocations and lower than that for the coarse incoherent precipitates.

本文言語英語
ページ(範囲)771-778
ページ数8
ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
88
11
DOI
出版ステータス出版済み - 11 2002
外部発表はい

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 物理化学および理論化学
  • 金属および合金
  • 材料化学

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