Analysis of Flow and Fracture Behavior of Copper as a Function of Temperature and Strain Rate Before and After Gaseous Hydrogen Charging
摘要
Copper with 3.50 wt. % zine was used for gaseous hydrogen charging from 9 to 17 ppm in Sievert’s apparatus at 800 °C with varying pressure from 680 to 830 torr. Tensile test samples in hydrogen charged condition were deformed at room temperature and strain rate of 10–3 s−1 for each hydrogen level. Ultimate tensile strength was found to vary from 383 to 361 MPa and ductility from 0.47 to 0.42 for 0 ppm to 17 ppm hydrogen levels. Ductile to brittle fracture has been observed during scanning electron microscopic analysis. During scanning electron microscopic analysis also observed that cleavage formation at higher hydrogen level. Microstructure analysis observed that grain size deceases as increase in hydrogen level. Thus, gaseous hydrogen charging results in decrease in strength and ductility at room temperature with an increase in hydrogen content.