Microstructure and mechanical properties of friction-stir welded St52 steel joints
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CitationKüçükömeroğlu, T., Aktarer, S.M., İpekoğlu, G., Çam, G. (2018). Microstructure and mechanical properties of friction-stir welded St52 steel joints. International Journal of Minerals, Metallurgy and Materials, 25 (12), pp. 1457-1464. https://doi.org/10.1007/s12613-018-1700-x
The aim of this work is to investigate the mechanical properties and microstructures of friction-stir welded (FSWed) St52 structural steel joints. In this study, St52 steel plates with a thickness of 4 mm were butt-welded by friction-stir welding (FSW) using a tungsten carbide tool having a conical pin. The microstructure of the welded zone consists of equiaxed fine ferrite, grain boundary ferrite, Widmanstatten ferrite, and aggregates of ferrite + cementite. The microhardness measurements showed that the hardness of the welded zone was significantly higher than that of the base metal. The FSWed St52 joint exhibited a significant strength overmatching in the weld region and a strength performance similar to or slightly higher than that of the base plate.