分接开关主驱动轴组织和低温力学特性研究

The microstructure and low-temperature mechanical properties of imported tap changer main drive shaft EN-GJS-700-2 ductile iron were analyzed and tested by chemical composition analysis, metallographic test, hardness test, low-temperature tensile test, low-temperature impact test and fracture micro characterization technology, and the effect of low temperature on the mechanical properties of the tap changer main drive shaft was studied. The results showed that with the decrease of the temperature, the yield strength and tensile strength of the tap changer increased slightly, the elongation after fracture decreased gradually, and the impact energy decreased slightly. Different temperatures had no significant effect on the tensile and impact fracture of the main drive shaft of the tap changer, and the fracture exhibited a brittle fracture characteristic.