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The change in the chemical composition and toughness of API 5L-X70 welds by addition of titanium
Beidokhti, B ; Sharif University of Technology | 2009
152
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- Type of Document: Article
- Publisher: 2009
- Abstract:
- The objective of this work was to study the influence of titanium variations on the API 5L-X70 steel weld metal properties. The relationship between microstructure and toughness of the weld deposit was studied by means of full metallographic, longitudinal tensile and Charpy-V notch tests on the specimens cut transversely to the weld beads. The best combination of microstructure and impact properties was obtained in the range of 0.02-0.05% titanium. By further increasing of titanium content, the microstructure was changed from a mixture of acicular ferrite, grain-boundary ferrite, Widmanstätten ferrite to a mixture of acicular ferrite, grain-boundary ferrite, bainite and ferrite with M/A microconstituent. Therefore, the mode of fracture also changed from dimpled ductile to quasicleavage. Titanium-base inclusions improve impact toughness by increasing the formation of acicular ferrite in the microstructure. The amount of manganese in inclusions was decreased with addition of titanium to the weld metal. © World Scientific Publishing Company
- Keywords:
- Bainite ; Manganese ; Quasi-cleavage ; Titanium
- Source: International Journal of Modern Physics B ; Volume 23, Issue 6-7 , 2009 , Pages 1209-1216 ; 02179792 (ISSN)
- URL: https://www.worldscientific.com/doi/abs/10.1142/S0217979209060701