KBb番号:037
モード:割れ
メカニズム①:応力腐食割れ(SCC)
'メカニズム②:水素誘起割れ(遅れ破壊)
特徴:応力が負荷された条件において金属中に原子状の水素が拡散侵入して生じる時間依存型破壊である・高強度鋼のき裂進展過程に着目すれば,一般に応力拡大係数が低い領域では旧オーステナイト粒界割れ,応力拡大係数の中間領域では粒内の流れ模様,応力拡大係数が高い領域では微小空洞の成長と合体(ディンプル)を示すという特徴がある・
主たる材料:高強度鋼,ステンレス鋼
事例:051 052? 053
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