Tensile property of a modeling specimen of DD6 single crystal cooling turbine blade

Tensile properties and SEM analysis were carried out in a modeling specimen of cooling turbine blade with [001] orientation. Three factors including temperatures, thickness and cooling holes were considered to study the influences on the mechanics properties. The results show that when the temperature is higher than 850°C, the ultimate strength and yield strength decrease with the increment of temperature, while for the elongation and area reduction, they increase. Also, the ultimate strength and yield strength of the 2.0 mm thick specimens are higher than those of the 1.5 mm thick specimens, the same results for the elongation and area reduction. Because of the stress and strain concentrations, not only the ultimate strength and yield strength of the specimens with cooling holes are lower than those of specimens without cooling holes, but also for the percentages of elongation and area reduction. Furthermore, from the SEM analysis of the fracture faces, we conclude that at 850°C the fracture surfaces are made up of smooth sloping planes, while at 980°C the fracture surfaces are mainly made up of dimples.