Acicular ferrite is regarded as the most desirable microstructural feature, in view of strength and toughness, in high strength pipeline steel weld metals. Recent evolution and diversity of mechanical property for base metal demand the same property as the weld. Therefore, understanding of the formation mechanism for acicular ferrite microstructure in weld is one of the essential problems for low carbon low alloy steel weld. In the present work, the morphological development of acicular ferrite in situ, was observed during weld cooling. The sample designed to form acicular ferrite microstructure was schematically heated and cooled by infrared imaging furnace and the morphological developments were directly observed using laser scanning confocal microscopy. The nucleation and growing at inclusion, sympathetic nucleation and impingement event of acicular ferrite were directly shown in high time resolution. To clarify the evolution mechanism, the inclusions related to acicular ferrite formation were investigated from the crystallographic points of view.
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2008 7th International Pipeline Conference
September 29–October 3, 2008
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4859-3
PROCEEDINGS PAPER
Morphological Development for Acicular Ferrite in High Strength Pipeline Steel Weld Metal
Yu-Ichi Komizo,
Yu-Ichi Komizo
Osaka University, Ibaraki, Osaka, Japan
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Hidenori Terasaki,
Hidenori Terasaki
Osaka University, Ibaraki, Osaka, Japan
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Tomonori Yamada
Tomonori Yamada
Osaka University, Ibaraki, Osaka, Japan
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Yu-Ichi Komizo
Osaka University, Ibaraki, Osaka, Japan
Hidenori Terasaki
Osaka University, Ibaraki, Osaka, Japan
Tomonori Yamada
Osaka University, Ibaraki, Osaka, Japan
Paper No:
IPC2008-64677, pp. 483-487; 5 pages
Published Online:
June 29, 2009
Citation
Komizo, Y, Terasaki, H, & Yamada, T. "Morphological Development for Acicular Ferrite in High Strength Pipeline Steel Weld Metal." Proceedings of the 2008 7th International Pipeline Conference. 2008 7th International Pipeline Conference, Volume 3. Calgary, Alberta, Canada. September 29–October 3, 2008. pp. 483-487. ASME. https://doi.org/10.1115/IPC2008-64677
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