Friction Stir Welding of High Carbon Tool Steel (SK85) below Eutectoid Temperature

Chung, Young Dong; Fujii, Hidetoshi; Nakata, Kazuhiro; Nogi, Kiyoshi

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タイトル	Friction Stir Welding of High Carbon Tool Steel (SK85) below Eutectoid Temperature
著者	Chung, Young Dong Chung, Young Dong
	Fujii, Hidetoshi Fujii, Hidetoshi
	Nakata, Kazuhiro Nakata, Kazuhiro
	Nogi, Kiyoshi Nogi, Kiyoshi
キーワード等	Hyper eutectoid steel (SK85, AISI-SAE W1-8)
	Friction Stir Welding, Butt welding
	Hardness
	A₁ point (eutectoid temperature 726ºC))
	Phase transformation
	Microstructure
抄録	The present study is concerned with applying FSW to a high carbon tool steel (0.85 wt % carbon, JIS-SK85, AISI-1080) with below and above A₁(726℃) welding conditions and analyzing the joints as well as evaluating the joint quality. Defect-free joints can be successfully fabricated and the joint structure and the mechanical properties were investigated for both conditions. The microstructures of the above A₁ joints mainly consisted of martensite. Therefore, the micro-hardness of the above A₁ joints is significantly higher at more than 1000HV. The tensile tests results are scattered and some of the joints are fractured at the stir zone while others are fractured the base metal. On the other hand, the microstructures of the below A₁ joints consist of ferrite with globular cementite, and grain-refinement occurs because no phase transformation to the martensite structures occurs. The high carbon tool steel was successfully friction-stir was welded below the A₁ and a method has been established to obtain sound joints which show a stable fracture and a good strength.
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	38
号	1
開始ページ	37
終了ページ	41
刊行年月	2009-09
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/5267
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.38 No.1 (2009-09)

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.38(1) P.37-P.41
DC.title	Friction Stir Welding of High Carbon Tool Steel (SK85) below Eutectoid Temperature
DC.creator	Chung, Young Dong
	Fujii, Hidetoshi
	Nakata, Kazuhiro
	Nogi, Kiyoshi
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	2009-09
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/5267
DC.subject	Hyper eutectoid steel (SK85, AISI-SAE W1-8)
	Friction Stir Welding, Butt welding
	Hardness
	A₁ point (eutectoid temperature 726ºC))
	Phase transformation
	Microstructure
DCTERMS.abstract	The present study is concerned with applying FSW to a high carbon tool steel (0.85 wt % carbon, JIS-SK85, AISI-1080) with below and above A₁(726℃) welding conditions and analyzing the joints as well as evaluating the joint quality. Defect-free joints can be successfully fabricated and the joint structure and the mechanical properties were investigated for both conditions. The microstructures of the above A₁ joints mainly consisted of martensite. Therefore, the micro-hardness of the above A₁ joints is significantly higher at more than 1000HV. The tensile tests results are scattered and some of the joints are fractured at the stir zone while others are fractured the base metal. On the other hand, the microstructures of the below A₁ joints consist of ferrite with globular cementite, and grain-refinement occurs because no phase transformation to the martensite structures occurs. The high carbon tool steel was successfully friction-stir was welded below the A₁ and a method has been established to obtain sound joints which show a stable fracture and a good strength.
citation_title	Friction Stir Welding of High Carbon Tool Steel (SK85) below Eutectoid Temperature
citation_author	Chung, Young Dong
	Fujii, Hidetoshi
	Nakata, Kazuhiro
	Nogi, Kiyoshi
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2009-09
citation_journal_title	Transactions of JWRI
citation_volume	38
citation_issue	1
citation_firstpage	37
citation_lastpage	41
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/5267
citation_keywords	Hyper eutectoid steel (SK85, AISI-SAE W1-8)
	Friction Stir Welding, Butt welding
	Hardness
	A₁ point (eutectoid temperature 726ºC))
	Phase transformation
	Microstructure

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