1110 低合金鋼の累積疲労損傷評価のための水素昇温脱離分析法の改良(OS11-3 材料の疲労挙動と損傷評価-計測-)

概要

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It has been recently revealed by the authors that the fatigue damage accumulation of low alloy steel can be detected by the change in hydrogen desorption characteristic, witich is measured by the thennal desorption spectrometry after charging the steel with hydrogen. In this study, the optimization of hydrogen charging condition was examined to improve the sensitivity for detecting the damage. The cathodic electrolysis for hydrogen charging was performed in 1 mol/L NaOH aqueous solutions with a wide variety of concentrations of NH_4SCN for various periods. Experimental results revealed that the amount of desorbed hydrogen, C_H, increased significantly with increasing NH_4SCN concentration before 0.1 mass % and it had a maximum value wiien the charging time was 12 h. The increase in C_H obtained under the modified charging condition with fatigue life was more pronounced compared with that under the conventional condition.
2010-10-09