Abstract
To improve the fatigue resistance of tungsten inert gas (TIG)-welded SS400 steel plates, friction stir processing (FSP) was performed on TIG weld beads. Although the tensile properties of the TIG-welded steel plates with FSP were similar to those without FSP, their bending strength exhibited about 1.4GPa at room temperature, which was 40% higher than that without FSP (about 1GPa). Similarly, FSP produced about 170% increase in the number of cycles to failure at an applied stress amplitude of 270MPa during three-point bending fatigue at room temperature. A fine-grained FSP region (grain sizes of about 1–2μm in diameter) enhanced grain-boundary strengthening, leading to the higher bending strength and bending fatigue resistance.
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