Delayed destruction - Okurehakai

…If cracks occur due to hydrogen absorbed during the pickling or plating process, they may be hydrogen embrittlement cracks, but they are not stress corrosion cracks because they do not occur in conjunction with corrosion. The phenomenon in which high-tensile steel cracks after a certain period of time under tensile stress while exposed to a very ordinary environment is specifically called delayed fracture. In the case of high-tensile steel, the stress during use is large, and in terms of the material's composition and structure, even a small amount of absorbed hydrogen can cause embrittlement cracks. …

*Some of the terminology used to refer to "delayed fracture" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…酸洗いやめっきの工程で吸蔵した水素が原因で割れるような場合は，水素脆化割れではあっても腐食に伴っておこるのではないので，応力腐食割れではない。高張力鋼がごくふつうの環境にさらされながら引張応力下である時間経過後に割れる現象を，とくに遅れ破壊delayed fractureと呼んでいる。高張力鋼の場合には，使用時の応力が大きく，材料の成分や組織の面からも少量の吸収水素で脆化割れの原因となる。…

※「遅れ破壊」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報