極低温における遅れ割れについての一考察

概要

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The effect of testing temperature on the incubation time of hydrogen-induced weld cracking at low temperatures was investigated, based on such conception that the quality damage of materials due to hydrogen is subjected to rate process. The HT-80 steel was used in the previous work and a plain carbon steel in the present study. The results indicate that (1) the delayed fracture occurs at very low temperatures, such as -196℃, (2) the activation energy determined by the incubation time is 11,000cal/mol at the temperatures over -30℃, 2,300cal/mol in the temperature range of -30 to -130℃, and (3) at temperatures below -130℃ the activation energy decreases below 2,000 cal/mol, therefore the potential barriers are probably overcome by an alternative mecanism such as tunneling.
社団法人溶接学会の論文
1981-02-05