水素透過度を指標とした高張力鋼板の遅れ破壊評価

DOI Web Site Web Site 被引用文献3件 参考文献26件
  • 北原 学
    (株)豊田中央研究所材料・プロセス1部
  • 辻 彩
    (株)豊田中央研究所材料・プロセス2部
  • 浅田 崇史
    (株)豊田中央研究所材料・プロセス1部
  • 鈴木 智博
    (株)豊田中央研究所材料・プロセス1部

書誌事項

タイトル別名
  • Delayed Fracture Evaluation of High-strength Steel Sheets Using the Hydrogen Permeability
  • スイソ トウカド オ シヒョウ ト シタ コウチョウリョク コウバン ノ オクレ ハカイ ヒョウカ

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抄録

<p>The application of high-strength steel sheets in automobiles has been increased to achieve low bodyweight and simultaneously enhance crashworthiness. High-strength steel sheets are susceptible to hydrogen embrittlement and it is essential to evaluate their delayed fracture resistance for appropriate use. Delayed fracture resistance is typically evaluated using the relationship between the amount of diffusible hydrogen and fracture strength obtained from a constant load test and the slow strain rate technique (SSRT). It is difficult to monitor the amount of diffusible hydrogen invading from the environment; the thermal desorption analysis is not a non-destructive analysis to obtain the amount of diffusible hydrogen and diffusible hydrogen is easily desorbed from the specimens. The hydrogen permeation test easily monitors the invasion of diffusible hydrogen. In this study, we evaluated the delayed fracture resistance of high-strength steel sheets using the hydrogen permeability obtained from the hydrogen permeation test. As a result, relationships between hydrogen permeability, mechanical properties obtained from SSRT, and the brittle fracture surface ratio were found to be consistent among various hydrogen invasion conditions, such as under hydrogen charging and corrosive environments. Furthermore, little diffusible hydrogen was detected using the hydrogen permeation test. Thus, delayed fracture resistance obtained from the relationship between hydrogen permeability and its mechanical properties proves the effectiveness of this method.</p>

収録刊行物

  • 鉄と鋼

    鉄と鋼 107 (7), 594-603, 2021

    一般社団法人 日本鉄鋼協会

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