金属組織
室温から200℃におけるC1260の塑性変形挙動
2020 年 59 巻 1 号 p. 96-99
詳細
2020 年 59 巻 1 号 p. 96-99
Heat–exchanger tubes mainly consist of phosphorous–deoxidized copper, which has excellent ductility, thermal conductivity, and corrosion resistance. However, in recent years, there has been an increased demand for high strengths and additional corrosion resistance, such as ant–nest corrosion. C1260 containing 0.20–0.40 mass% phosphorus in copper is a promising alternative material for heat–exchanger tube, where previous studies have reported restricting for ant–nest corrosion in the thickness direction. In this study, the plastic deformation behavior of C1260 was investigated at temperatures ranging from room temperature to 200°C by performing tensile and creep tests. With decreasing deformation rate, improved ductility was observed via advances in the recovery process. Furthermore, the time to fracture of C1260 in the creep test was significantly increased compared with a test specimen that does not contain phosphorus. TEM observations of fractured C1260 during the creep test show the presence of dynamic recrystallized grains, suggesting a decrease in the stacking fault energy upon increasing the amount of additive phosphorus to the C1260 sample.
