Microstructure and mechanical properties of friction-stir welded St52 steel joints |
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Authors: | Tevfik Küçükömero?lu Semih M Aktarer Güven ?peko?lu Gürel Çam |
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Institution: | 1.Department of Mechanical Engineering,Karadeniz Technical University,Trabzon,Turkey;2.Department of Automotive Technology,Recep Tayyip Erdogan University,Rize,Turkey;3.Department of Mechanical Engineering,Iskenderun Technical University,Hatay,Turkey |
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Abstract: | 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. |
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