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Increase of bending fatigue resistance for tungsten inert gas welded SS400 steel plates using friction stir processing
Highlights The first time FSP modification of bending properties in the TIG-welded steel plates. FSP produced about 40% increase in bending strength at RT. FSP produced about 170% increase in the number of cycles to failure at 270MPa at RT. FSP produced a zigzag-shaped crack at the fatigue fracture start portion. A fine-grained FSP region (grain sizes of about 1–2μm in diameter) was observed.
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.
Increase of bending fatigue resistance for tungsten inert gas welded SS400 steel plates using friction stir processing
Highlights The first time FSP modification of bending properties in the TIG-welded steel plates. FSP produced about 40% increase in bending strength at RT. FSP produced about 170% increase in the number of cycles to failure at 270MPa at RT. FSP produced a zigzag-shaped crack at the fatigue fracture start portion. A fine-grained FSP region (grain sizes of about 1–2μm in diameter) was observed.
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.
Increase of bending fatigue resistance for tungsten inert gas welded SS400 steel plates using friction stir processing
Ito, Kazuhiro (author) / Okuda, Tatsuya (author) / Ueji, Rintaro (author) / Fujii, Hidetoshi (author) / Shiga, Chiaki (author)
2014-04-28
6 pages
Article (Journal)
Electronic Resource
English
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