高強度CrMo鋼での水素放出曲線の解析と粒界での水素トラップ

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  • Analysis of hydrogen desorption curves and hydrogen trapping along grain boundary in high strength CrMo steels
  • コウキョウド CrMoコウ デ ノ スイソ ホウシュツ キョクセン ノ カイセキ ト リュウカイ デ ノ スイソ トラップ

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In order to understand the hydrogen embrittlement, it is important to clarify how hydrogen atoms exist in steels. To this end, the methodology was explored for the desorption analysis and it was applied to analyze hydrogen trapping sites in quenched and tempered SCM435 steel. Curve fitting by Kissinger equation or McNabb-Foster equation should be theoretically valid. But they were not useful for the prediction of desorption curve nor details of trapping sites. The measured desorption curves are distorted by the disturbance in the flow line of carrier gas. This makes hydrogen evolution receive a kind of smoothing:Hydrogen emission from the specimen is not reproduced by the measurement. Fortunately analysis by the use of Gaussian distribution has been proved to be practically valid. The desorption curves of quenched and tempered SCM435 steels are fitted fairly precisely by two Gaussian distribution. Thanks to both the published desorption curves at different heating rates and the previously reported desorption curves of different tempering temperatures, the lower temperature peak around 338K was ascribed to the hydrogen trapped by elastic strain field of dislocation;the other peak around 368K was judged to be attributable to the hydrogen trapped by prior austenite grain boundaries.

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  • 圧力技術

    圧力技術 51 (5), 261-268, 2013

    一般社団法人 日本高圧力技術協会

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