Microstructural Evolution of HSLA ISO 3183 X80M (API 5L X80) Friction Stir Welded Joints

Evaluation was made of friction stir welded joints, identifying conditions that resulted in satisfactory welded joints free from defects and with microstructural characteristics that provided good mechanical properties. Microstructural characterization and cooling curve analysis of the joints with l...

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Bibliographic Details
Published in:Metals and materials international 2018, 24(5), , pp.1120-1132
Main Authors: Hermenegildo, Tahiana F. C., Santos, Tiago F. A., Torres, Edwar A., Afonso, Conrado R. M., Ramirez, Antonio J.
Format: Article
Language:English
Subjects:
Bainite
Carbides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cold welding
Cooling curves
Deformation
Dispersion
Dynamic recrystallization
Engineering Thermodynamics
Evolution
Ferrite
Friction stir welding
Heat and Mass Transfer
Heat treating
Machines
Magnetic Materials
Magnetism
Manufacturing
Martensite
Martensitic transformations
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Processes
Solid Mechanics
Thermal transformations
Welded joints
재료공학
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Summary:Evaluation was made of friction stir welded joints, identifying conditions that resulted in satisfactory welded joints free from defects and with microstructural characteristics that provided good mechanical properties. Microstructural characterization and cooling curve analysis of the joints with lower and higher heat inputs evidenced deformation below and above the non-recrystallization temperature (T nr ) and dynamic recrystallization during microstructural evolution. Microscopy analyses showed acicular ferrite, bainitic ferrite, and coalesced bainite microstructures in the stir zone of the cold weld (lower heat input), while the stir zone of the hot weld (higher heat input) contained bainitic ferrite, acicular ferrite, coalesced bainite, martensite, and dispersed carbides. Granular bainite and dispersed carbides were observed in all the heat affected zones. Analysis of the microstructural transformations, together with the thermal history of the joints, showed that the variable that had the greatest influence on the morphology of the bainite (granular bainite/bainitic ferrite) was the deformation temperature.
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-018-0111-x