Microstructure and mechanical properties of friction stir welded joints of medium carbon steels
- Miyano Y. ,
- Ueji R. and
- Fujii H.
- Miyano Y. ,
- Ueji R. and
- Fujii H.
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Description
Friction stir butt welding experiments were conducted on S45C medium carbon steel sheets (thickness 1.5 mm) under various conditions and the microstructure and mechanical properties of the welded joints were investigated. Single run butt welding was performed using a load-controlled friction stir welding machine with a WC-based tool at travel speeds of 100-400 mm/min and tool rotational speeds of 100-400 rpm. Microstructure was observed by optical microscopy, field emission type SEM and electron back scattering diffraction. Hardness profiles across the stir zone were measured using Vickers hardness tests. Issues discussed include preferential formation of kissing bonds at high rotational speed and low travel speed, hardness dependence on process conditions and the slopes of the Hall-Petch type relationship.
10th International Symposium, 20-22 May 2014, Session 10B: High Temperature, Paper 04
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