高強度鋼の水素割れ感受性評価におけるWeibull形状パラメータの決定方法

DOI Web Site Web Site 被引用文献8件 参考文献13件

書誌事項

タイトル別名
  • Determination Method of Weibull Shape Parameter for Evaluation of the Hydrogen Embrittlement Susceptibility of High Strength Steel
  • コウキョウド コウ ノ スイソ ワレ カンジュセイ ヒョウカ ニ オケル Weibull ケイジョウ パラメータ ノ ケッテイ ホウホウ

この論文をさがす

抄録

An experimental method to obtain the shape parameter m in the Weibull stress for evaluation of hydrogen embrittlement (HE) was examined in a commercial JIS SCM440 steel with the tensile strength of 1403 MPa. The stepwise HE tests were performed by using circumferentially notched round-bar specimens with the stress concentration factor of 4.9 after hydrogen pre-charging and homogenization treatments. The applied stress of the first step loading was set at 702 MPa and the stress increment from the second step was 14 MPa. The holding time was over 12 h for the first step and over 2 h for each step from the second step. It was conformed by acoustic emission measurement that the first cracking and final fracture occurred in the same step. The diffusible hydrogen content was measured by thermal desorption analysis immediately after fracture. The distribution of stress and hydrogen content near notch root was calculated by FE-analysis. By this procedure, it was able to obtain the distribution of critical Weibull stress under the condition that the local diffusible hydrogen content in fracture process zone was constant. The shape parameter m was determined to be 46 for the present steel. In the discussion part, it was confirmed that the evaluation of the HE susceptibility based on the local approach is appropriate and it was pointed out that the hydrogen content distribution in the fracture process zone must be taken into account for evaluating the HE.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 65 (12), 1082-1090, 2001

    公益社団法人 日本金属学会

被引用文献 (8)*注記

もっと見る

参考文献 (13)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ