Role of Sigma Phase on Hydrogen Embrittlement of Super Duplex Stainless Steels

Ikeuchi, Kenji

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タイトル	Role of Sigma Phase on Hydrogen Embrittlement of Super Duplex Stainless Steels
著者	Ikeuchi, Kenji Ikeuchi, Kenji
キーワード等	Duplex stainless steel
	Hydrogen Embrittlement
	Corrosion
	Microstructure
	Sigma phase
	Secondary austenite
	Fractography
抄録	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.
公開者	大阪大学接合科学研究所
公開者の別表記	Joining and Welding Research Institute, Osaka University
公開者 (ヨミ)	オオサカダイガクセツゴウカガクケンキュウジョ
掲載誌名	Transactions of JWRI
巻	34
号	2
開始ページ	63
終了ページ	68
刊行年月	2005-12
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/11360
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.34 No.2 (2005-12)

著者版フラグ	publisher
NII資源タイプ	紀要論文
ローカル資源タイプ	紀要論文
dcmi資源タイプ	text
DCTERMS.bibliographicCitation	Transactions of JWRI.34(2) P.63-P.68
DC.title	Role of Sigma Phase on Hydrogen Embrittlement of Super Duplex Stainless Steels
DC.creator	Ikeuchi, Kenji
DC.publisher	大阪大学接合科学研究所
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	2005-12
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/11360
DC.subject	Duplex stainless steel
	Hydrogen Embrittlement
	Corrosion
	Microstructure
	Sigma phase
	Secondary austenite
	Fractography
DCTERMS.abstract	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.
citation_title	Role of Sigma Phase on Hydrogen Embrittlement of Super Duplex Stainless Steels
citation_author	Ikeuchi, Kenji
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2005-12
citation_journal_title	Transactions of JWRI
citation_volume	34
citation_issue	2
citation_firstpage	63
citation_lastpage	68
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/11360
citation_keywords	Duplex stainless steel
	Hydrogen Embrittlement
	Corrosion
	Microstructure
	Sigma phase
	Secondary austenite
	Fractography

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