Residual Stress of Steels for Structure and Filet Weld Zone after Laser Peening

Sakino, Yoshihiro; Sano, Yuji; Kim, You-Chul

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タイトル	Residual Stress of Steels for Structure and Filet Weld Zone after Laser Peening
著者	Sakino, Yoshihiro Sakino, Yoshihiro
	Sano, Yuji Sano, Yuji
	Kim, You-Chul Kim, You-Chul
キーワード等	Laser Peening
	Residual Stress
	Fillet Weld
	Steel for Structures
	Vickers Hardness
抄録	Laser peening is an innovative surface enhancement technology to introduce a compressive residual stress in metallic materials. Experimental results showed that laser peening was effective in preventing SCC and enhancing fatigue strength. However the effects of laser peening on steels for structure and their welded zone are not completely clarified. In this paper, laser peening conditions for four grades of steels for structure were examined. Moreover residual stress of the fillet weld zone after laser peening was investigated by comparing it with that before laser peening. X-ray diffraction was used to measure the residual stress. Main results are summarized as follows. 1) Laser peening affects steel hardness up to the depth of 0.6mm. 2) Laser peening conditions for over 400kN/㎟ grade steels were selected as 200 mJ laser pulse energy, 8 ns pulse duration, 0.8 mm spot diameter and 3600 pulse/㎠ irradiation pulse density. 3) Laser peening can change tensile residual stress to large compressive residual stress in the welding zone. The nearer to the welding toe, the larger this effect by laser peening became.
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	36
号	2
開始ページ	81
終了ページ	86
刊行年月	2007-12
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/10451
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.36 No.2 (2007-12)

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.36(2) P.81-P.86
DC.title	Residual Stress of Steels for Structure and Filet Weld Zone after Laser Peening
DC.creator	Sakino, Yoshihiro
	Sano, Yuji
	Kim, You-Chul
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	2007-12
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/10451
DC.subject	Laser Peening
	Residual Stress
	Fillet Weld
	Steel for Structures
	Vickers Hardness
DCTERMS.abstract	Laser peening is an innovative surface enhancement technology to introduce a compressive residual stress in metallic materials. Experimental results showed that laser peening was effective in preventing SCC and enhancing fatigue strength. However the effects of laser peening on steels for structure and their welded zone are not completely clarified. In this paper, laser peening conditions for four grades of steels for structure were examined. Moreover residual stress of the fillet weld zone after laser peening was investigated by comparing it with that before laser peening. X-ray diffraction was used to measure the residual stress. Main results are summarized as follows. 1) Laser peening affects steel hardness up to the depth of 0.6mm. 2) Laser peening conditions for over 400kN/㎟ grade steels were selected as 200 mJ laser pulse energy, 8 ns pulse duration, 0.8 mm spot diameter and 3600 pulse/㎠ irradiation pulse density. 3) Laser peening can change tensile residual stress to large compressive residual stress in the welding zone. The nearer to the welding toe, the larger this effect by laser peening became.
citation_title	Residual Stress of Steels for Structure and Filet Weld Zone after Laser Peening
citation_author	Sakino, Yoshihiro
	Sano, Yuji
	Kim, You-Chul
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2007-12
citation_journal_title	Transactions of JWRI
citation_volume	36
citation_issue	2
citation_firstpage	81
citation_lastpage	86
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/10451
citation_keywords	Laser Peening
	Residual Stress
	Fillet Weld
	Steel for Structures
	Vickers Hardness

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