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SCC susceptibility of cold-worked stainless steel with minor element additions

微量元素を添加した冷間加工済ステンレス鋼のSCC感受性

中野 純一; 根本 義之  ; 塚田 隆 ; 内一 哲哉*

Nakano, Junichi; Nemoto, Yoshiyuki; Tsukada, Takashi; Uchimoto, Tetsuya*

加工硬化層を有する低炭素ステンレス鋼の応力腐食割れ(SCC)感受性を調べるため、高純度304ステンレス鋼を溶製し、微量元素、Si, S, P, CあるいはTiを添加した。加工硬化層をステンレス鋼表面に切削加工により導入した。試験片を42%MgCl$$_{2}$$の沸騰溶液に20時間浸漬し、発生したき裂の数と長さを調べた。すべての試験片中、Pを含む試験片のSCC感受性が最も高く、Cを含む試験片の感受性が最も低かった。磁気力顕微鏡により、マルテンサイト相と見られる磁性相を表面近傍に検出した。マルテンサイト相の耐食性はオーステナイト相のそれよりも低いことから、微量元素の添加は、変態したマルテンサイト量、すなわちオーステナイト安定性を通してSCC感受性に影響を及ぼしているのだろう。

To examine the effects of minor elements on stress corrosion cracking (SCC) susceptibility of low carbon stainless steels with work hardened layer, a high purity type 304 stainless steel was fabricated and minor elements, Si, S, P, C or Ti, were added. Work hardened layer was introduced by shaving on the surface of stainless steels. The specimens were exposed to a boiling 42% MgCl$$_{2}$$ solution for 20 hours and the number and the length of initiated cracks were examined. SCC susceptibility of the specimen with P was the highest and that of the specimen with C was the lowest in all specimens. By magnetic force microscope examination, magnetic phase expected to be martensitic phase was detected near surface. Since corrosion resistance of martensite is lower than that of austenite, the minor elements additions would affect SCC susceptibility through the amount of the transformed martensite, i.e. austenite stability.

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パーセンタイル:18.41

分野:Materials Science, Multidisciplinary

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