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

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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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Authors and Affiliations

  1. Department of Mechanical Engineering, Karadeniz Technical University, Trabzon, 61080, Turkey

    Tevfik Küçükömeroğlu

  2. Department of Automotive Technology, Recep Tayyip Erdogan University, Rize, 53100, Turkey

    Semih M. Aktarer

  3. Department of Mechanical Engineering, Iskenderun Technical University, Hatay, 31200, Turkey

    Güven İpekoğlu & Gürel Çam

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  1. Tevfik Küçükömeroğlu
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  2. Semih M. Aktarer
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  3. Güven İpekoğlu
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  4. Gürel Çam
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Correspondence to Güven İpekoğlu.

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Küçükömeroğlu, T., Aktarer, S.M., İpekoğlu, G. et al. Microstructure and mechanical properties of friction-stir welded St52 steel joints. Int J Miner Metall Mater 25, 1457–1464 (2018). https://doi.org/10.1007/s12613-018-1700-x

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  • DOI: https://doi.org/10.1007/s12613-018-1700-x

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