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

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

doi:https://doi.org/10.18910/5267

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

Chung, Young Dong; Fujii, Hidetoshi; Nakata, Kazuhiro et al.

Transactions of JWRI, 2009, 38(1), 37-41

Number of Access:616（2025-11-20 12:58 Counts）

Identifier to cite or link to this item: https://doi.org/10.18910/5267

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Title	Friction Stir Welding of High Carbon Tool Steel (SK85) below Eutectoid Temperature
Creator	CreatorName Chung, Young Dong
	NRID 1000000247230 1000000247230 ORCID 0000-0002-5023-3844 0000-0002-5023-3844 researchmap permalink read0051741 read0051741 Scopus Author ID 7403071460 7403071460 CreatorName Fujii, Hidetoshi
	NRID 1000080112069 1000080112069 CreatorName Nakata, Kazuhiro
	NRID 1000070029335 1000070029335 CreatorName Nogi, Kiyoshi
Subject	Hyper eutectoid steel (SK85, AISI-SAE W1-8)
	Friction Stir Welding, Butt welding
	Hardness
	A₁ point (eutectoid temperature 726ºC))
	Phase transformation
	Microstructure
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.
Publisher	大阪大学接合科学研究所
	オオサカダイガクセツゴウカガクケンキュウジョ
	Joining and Welding Research Institute, Osaka University
Source Title	Transactions of JWRI
Volume (Issue)	38(1)
Page	37-41
Date of Issued	2009-09
Language	English
Handle URL	https://hdl.handle.net/11094/5267
DOI	https://doi.org/10.18910/5267
PISSN	03874508
NCID	AA00867058
Access Rights	open access
oaire:version	Version of Record
Category	紀要論文 Departmental Bulletin Paper
Category	Transactions of JWRI / Vol.38 No.1 (2009-09)

Resource Type	departmental bulletin paper
Local Type	Departmental Bulletin Paper
DCMI Type	Text
DCTERMS.bibliographicCitation	Transactions of JWRI. 2009, 38(1), p. 37-41
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
	オオサカダイガクセツゴウカガクケンキュウジョ
	Joining and Welding Research Institute, Osaka University
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2009-09
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.
DC.identifier	10.18910/5267
DC.format	5267
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	English
citation_date	2009-09
citation_journal_title	Transactions of JWRI
citation_volume	38
citation_issue	1
citation_firstpage	37
citation_lastpage	41
citation_public_url	https://hdl.handle.net/11094/5267
citation_doi_detail	10.18910/5267
citation_doi	https://doi.org/10.18910/5267

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

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