Role of Sigma Phase on Hydrogen Embrittlement of Super Duplex Stainless Steels
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説明
The role of sigma phase on corrosion and hydrogen embrittlement of super duplex stainless steels was investigated by using corrosion tests, transmission electron microscopy (TEM) and fractography. The materials used were type 329J1, SAF2205 and SAF2507 duplex stainless steels. The specimens were heated at 923K to 1223K in order to investigate the precipitation of sigma phase (Fe-Cr-Mo compound). The evaluation of corrosion was made using a 10% oxalic acid test (ASTM A262A) and Strauss test (ASTM A262E). Hydrogenation of the specimens was achieved by cathodic charging in a 5%H₂SO₄ solution and the hydrogen embrittlement was evaluated using slow strain rate testing (SSRT). The duplex stainless steels consist of ferrite and austenite microstructure. The secondary austenite was preferentially corroded but the sigma phase was hardly corroded by using ASTM A-262A and A262E tests. The sigma phase enhanced hydrogen embrittlement. The fracture morphology showed that the fracture facet size was related to the sigma phase precipitated around austenite. The crack due to hydrogen embrittlement occurred and propagated at the sigma-ferrite interface on the basis of the 3-D reconstruction system of fractography.
収録刊行物
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- Transactions of JWRI
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Transactions of JWRI 34 (2), 63-68, 2005-12
大阪大学接合科学研究所
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詳細情報 詳細情報について
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- CRID
- 1390575727755319680
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- NII論文ID
- 120004845548
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- NII書誌ID
- AA00867058
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- DOI
- 10.18910/11360
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- HANDLE
- 11094/11360
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- ISSN
- 03874508
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- 本文言語コード
- en
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- 資料種別
- departmental bulletin paper
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- データソース種別
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- JaLC
- IRDB
- CiNii Articles
