Use of Slag Containing Water as Lubricant in High Straining Rolling for Ultrafine-grained Steels

Nakamoto, Masashi; Lee, Joonho; Tanaka, Toshihiro; Ikeda, Jiro; Inagaki, Satoshi

doi:info:doi/10.2355/isijinternational.45.1567

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タイトル	Use of Slag Containing Water as Lubricant in High Straining Rolling for Ultrafine-grained Steels
著者	Nakamoto, Masashi Nakamoto, Masashi
	Lee, Joonho Lee, Joonho
	Tanaka, Toshihiro Tanaka, Toshihiro
	Ikeda, Jiro Ikeda, Jiro
	Inagaki, Satoshi Inagaki, Satoshi
キーワード等	lubricant
	waste slag
	high straining rolling
	ultrafine-grained steel
	slag containing water
	glass transition temperature
	hydrothermal condition
	porous structure
	water release
内容	The Iron and Steel Institute of Japan
抄録	We investigated the possibility of using waste slag as a lubricant in high straining rolling for ultrafine-grained steels. When slag is applied as a lubricant, it might satisfy the requirement for stable biting workpieces because slag is as stable as glass with high hardness at the biting temperatures in rolling (100-200°C). On the other hand, ordinary slag doesn't have the fluidity necessary to provide a lubricating effect at rolling temperatures of 300-400°C since its melting temperature is usually high. However, slag containing water has been targeted as a new lubricant, and we focused on lowering the glass transition temperature and the structural change of slag containing water with the aim of improving the lubricity of slag in rolling. The microstructures of slag containing water and slag that released water were observed in the present study, along with in-situ observation of water released from the surface of slag containing water were conducted after heating in a SiO_2-Na_2O-B_2O_3 slag system. We found that water was mainly contained in the phase formed by ions dissolved from the original slag under hydrothermal conditions, and the amount of water was dependent on the state of the phase, such as glass or crystal. It was confirmed that slag containing water could provide a lubricating effect when the water is released from the slag above the glass transition temperature because a porous structure is formed due to the water release.
公開者	日本鉄鋼協会
公開者の別表記	The Iron and Steel Institute of Japan
公開者 (ヨミ)	ニホン　テッコウ　キョウカイ
掲載誌名	ISIJ International
巻	45
号	11
開始ページ	1567
終了ページ	1571
刊行年月	2005
ISSN	09151559
NCID	AA10680712
DOI (出版社版)	info:doi/10.2355/isijinternational.45.1567
URL	http://hdl.handle.net/11094/26407
権利情報	© 2005 ISIJ
言語	英語
カテゴリ	学術雑誌論文 Journal Article

著者版フラグ	publisher
NII資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
dcmi資源タイプ	text
DCTERMS.bibliographicCitation	ISIJ International.45(11) P.1567-P.1571
DC.title	Use of Slag Containing Water as Lubricant in High Straining Rolling for Ultrafine-grained Steels
DC.creator	Nakamoto, Masashi
	Lee, Joonho
	Tanaka, Toshihiro
	Ikeda, Jiro
	Inagaki, Satoshi
DC.publisher	日本鉄鋼協会
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	2005
DC.identifier	info:doi/10.2355/isijinternational.45.1567
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/26407
DC.subject	lubricant
	waste slag
	high straining rolling
	ultrafine-grained steel
	slag containing water
	glass transition temperature
	hydrothermal condition
	porous structure
	water release
DC.description	The Iron and Steel Institute of Japan
DCTERMS.abstract	We investigated the possibility of using waste slag as a lubricant in high straining rolling for ultrafine-grained steels. When slag is applied as a lubricant, it might satisfy the requirement for stable biting workpieces because slag is as stable as glass with high hardness at the biting temperatures in rolling (100-200°C). On the other hand, ordinary slag doesn't have the fluidity necessary to provide a lubricating effect at rolling temperatures of 300-400°C since its melting temperature is usually high. However, slag containing water has been targeted as a new lubricant, and we focused on lowering the glass transition temperature and the structural change of slag containing water with the aim of improving the lubricity of slag in rolling. The microstructures of slag containing water and slag that released water were observed in the present study, along with in-situ observation of water released from the surface of slag containing water were conducted after heating in a SiO_2-Na_2O-B_2O_3 slag system. We found that water was mainly contained in the phase formed by ions dissolved from the original slag under hydrothermal conditions, and the amount of water was dependent on the state of the phase, such as glass or crystal. It was confirmed that slag containing water could provide a lubricating effect when the water is released from the slag above the glass transition temperature because a porous structure is formed due to the water release.
DC.rights	© 2005 ISIJ
citation_title	Use of Slag Containing Water as Lubricant in High Straining Rolling for Ultrafine-grained Steels
citation_author	Nakamoto, Masashi
	Lee, Joonho
	Tanaka, Toshihiro
	Ikeda, Jiro
	Inagaki, Satoshi
citation_publisher	日本鉄鋼協会
citation_language	英語
citation_date	2005
citation_journal_title	ISIJ International
citation_volume	45
citation_issue	11
citation_firstpage	1567
citation_lastpage	1571
citation_issn	09151559
citation_doi	info:doi/10.2355/isijinternational.45.1567
citation_public_url	http://hdl.handle.net/11094/26407
citation_keywords	lubricant
	waste slag
	high straining rolling
	ultrafine-grained steel
	slag containing water
	glass transition temperature
	hydrothermal condition
	porous structure
	water release

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