Residual Stresses in Flash Butt Welded Rail

Cal, Zhipeng; Nawafune, Masashi; Ma, Ninshu; Qu, Yuebo; Cao, Bin; Murakawa, Hidekazu

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タイトル	Residual Stresses in Flash Butt Welded Rail
著者	Cal, Zhipeng Cal, Zhipeng
	Nawafune, Masashi Nawafune, Masashi
	Ma, Ninshu Ma, Ninshu
	Qu, Yuebo Qu, Yuebo
	Cao, Bin Cao, Bin
	Murakawa, Hidekazu Murakawa, Hidekazu
キーワード等	Flash butt welding
	U71Mn Rail
	Residual Stress
	Phase Transformation
	Measurement
	FEM Simulation
抄録	The residual stresses on the surface of a rail joined by flash-butt welding are measured using a hole-drilling method and the thermal elastic-plastic deformation process considering the phase transformation are simulated using FEM code JWRIAN. The residual stresses measured by experiments and computed by FEM have an acceptable agreement in accuracy. The simulation results show that the phase transformation in the cooling stage has a significant effect on the residual stress distribution and its values. The tensile or compressive state for residual stresses near the welding section strongly depends on the phase transformation which occurred during the cooling process. The biaxial tensile stresses are produced at the web near the fusion line of the flash butt welded rail. The biaxial tensile stresses increase the risk of cracks. Although the Martensite phase transformation during the cooling process at top and bottom near the fusion line produces compressive stress, it increases the brittleness at the same time. Therefore, the proper heat treatment after welding is still necessary in order to improve the toughness.
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	40
号	1
開始ページ	79
終了ページ	87
刊行年月	2011-06
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/4606
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.40 No.1 (2011-06)

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.40(1) P.79-P.87
DC.title	Residual Stresses in Flash Butt Welded Rail
DC.creator	Cal, Zhipeng
	Nawafune, Masashi
	Ma, Ninshu
	Qu, Yuebo
	Cao, Bin
	Murakawa, Hidekazu
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	2011-06
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/4606
DC.subject	Flash butt welding
	U71Mn Rail
	Residual Stress
	Phase Transformation
	Measurement
	FEM Simulation
DCTERMS.abstract	The residual stresses on the surface of a rail joined by flash-butt welding are measured using a hole-drilling method and the thermal elastic-plastic deformation process considering the phase transformation are simulated using FEM code JWRIAN. The residual stresses measured by experiments and computed by FEM have an acceptable agreement in accuracy. The simulation results show that the phase transformation in the cooling stage has a significant effect on the residual stress distribution and its values. The tensile or compressive state for residual stresses near the welding section strongly depends on the phase transformation which occurred during the cooling process. The biaxial tensile stresses are produced at the web near the fusion line of the flash butt welded rail. The biaxial tensile stresses increase the risk of cracks. Although the Martensite phase transformation during the cooling process at top and bottom near the fusion line produces compressive stress, it increases the brittleness at the same time. Therefore, the proper heat treatment after welding is still necessary in order to improve the toughness.
citation_title	Residual Stresses in Flash Butt Welded Rail
citation_author	Cal, Zhipeng
	Nawafune, Masashi
	Ma, Ninshu
	Qu, Yuebo
	Cao, Bin
	Murakawa, Hidekazu
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2011-06
citation_journal_title	Transactions of JWRI
citation_volume	40
citation_issue	1
citation_firstpage	79
citation_lastpage	87
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/4606
citation_keywords	Flash butt welding
	U71Mn Rail
	Residual Stress
	Phase Transformation
	Measurement
	FEM Simulation

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