Departmental Bulletin Paper 準安定オーステナイト系ステンレス鋼の低サイクル腐食疲労におけるき裂の発生機構
ジュンアンテイ オーステナイトケイ ステンレスコウ ノ テイサイクル フショク ヒロウ ニオケル キレツ ノ ハッセイ キコウ
Formation mechanism of cracks in low-cycle corrosion fatigue of metastable austenitic stainless steel

白崎, 亮也  ,  宮本, 博之  ,  藤原, 弘  ,  シラサキ, リョウヤ  ,  ミヤモト, ヒロユキ  ,  フジワラ, ヒロシ  ,  Shirasaki, Ryoya  ,  Miyamoto, Hiroyuki  ,  Fujiwara, Hiroshi

57 ( 1 )  , pp.1 - 6 , 2016-04-30 , 同志社大学ハリス理化学研究所 , Transcription:ドウシシャ ダイガク ハリス リカガク ケンキュウジョ , Alternative:Harris Science Research Institute of Doshisha University
Influence of [plastic strain amplitude] on crack formation and fatigue life of SUS304 steel in aqueous NaCl solution has been investigated focusing on the role of deformation induced martensite (DIM) on the crack initiation. Fatigue life was overall lower than that in air, and the difference became considerably larger at lower plastic strain amplitude, Δε[p] than 0.2-0.3. In other words, fatigue life was less dependent on Δε[p] at lower Δε[p] regime. The two regimes with a different dependence of fatigue life on Δε[p] was recognized, and can be attributed to the presence of DIM. In higher Δε[p], where the number and size pits are relatively high, the primary crack initiated from a pit. On the other hand, in lower Δε[p], the primary crack tends to initiate at intergranular corrosion groove. Indeed, the volume fraction of DIM was negligibly small at the lower Δε[p] regime, and it increased with an increase of Δε[p] forming pit initiation sites. It is concluded that DIM have an important role on the mode of corrosion and crack initiation under the cyclic deformation in corrosive media.
内容記述中の[plastic strain amplitude]は斜体文字、[p]は下付き文字

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