Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 423, Issue 1-2, Pages 324-330Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.02.038
Keywords
low-carbon steel; friction stir welding; martensite process; ultrafine grained microstructure; hardness; martensite
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The combination of friction stir welding (FSW) and a thermomechanical process for ultrafine grained steel (martensite process) was studied in order to obtain a preferable balance between the strength of the base metal and that in the stir zone while maintaining a high strength in both areas. Plain low-carbon steels with three kinds of microstructures, (lath-martensite, ultrafine lamellar dislocation cell structure and multiphased ultrafine grained structure) were prepared by the martensite process and examined for FS welding. The microstructure and hardness around/in the stir zone were significantly affected by the microstructure of the base metal. After the FSW, the cold-rolled steel had the highest strength in the stir zone with the smallest ferrite grain size of the three. Subsequent annealing of the cold-rolled and FS welded steel realized higher strength in both the base metal and the stir zone than that of the conventional plain low-carbon steel. (c) 2006 Elsevier B.V. All rights reserved.
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