:Studies on Friction Welding of SUS 304 (Report 2)

概要

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Mechanical properties of austenitic stainless steel friction welded joint have been studied in connection with the amount of non-metallic inclusion, namely sulfur content, in base metal. In this experiment, the effect of sulfur content of base metal on tensile strength, elongation, reduction of area, and Charpy absorbed energy of friction welded joint was investigated by changing the amount of sulfur in the region. of 0.014%-0.204%. The results obtained are summarized as follows. 1) Ratios of the effect of sulfur content on each of the mechanical properties of friction welded joint and those of base metal are 5:1 in elongation, 3:1 in reduction of area, , and 1:1 in Charpy absorbed energy. 2) Ductility and notch toughness of friction welded joint decrease with the increase in sulfur content of base metal. However, the effect of friction welding on the ductility of joint is slight, if the sulfur content is less than 0.025%. 3) Elongation of base metal is closely related to reduction of area and Charpy absorbed energy of friction welded joint. Therefore, it can be considered that the elongation of base metal is one of the indices to the friction weldability of that material.
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