Microstructure and mechanical properties of friction-stir welded St52 steel joints


KÜÇÜKÖMEROĞLU T., Aktarer S. M. , İPEKOĞLU G., ÇAM G.

INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS, cilt.25, ss.1457-1464, 2018 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 25 Konu: 12
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1007/s12613-018-1700-x
  • Dergi Adı: INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
  • Sayfa Sayıları: ss.1457-1464

Özet

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.