Microstructural Evolution of HSLA ISO 3183 X80M (API 5L X80) Friction Stir Welded Joints |
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| Authors: | Tahiana F. C. Hermenegildo,Tiago F. A. Santos,Edwar A. Torres,Conrado R. M. Afonso author-information" >,Antonio J. Ramirez author-information" > |
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| Affiliation: | 1.Department of Mechanical Engineering,Universidade Federal de Pernambuco,Recife,Brazil;2.Department of Mechanical Engineering,Universidad de Antioquia,Medellin,Colombia;3.Department of Materials Engineering,Universidade Federal de S?o Carlos,S?o Carlos,Brazil;4.Department of Materials Science and Engineering,Ohio State University,Columbus,USA |
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| Abstract: | 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 (Tnr) 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. |
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