Effects of Alloying Elements on the Properties of Ni-Mo-Cr Superalloys with Low Thermal Expansion

摘要

The effects of alloying elements including tungsten, molybdenum and cobalt on the thermal expansion and mechanical properties of Ni-Mo-Cr superalloys were investigated. It was founded that cobalt had no influence on the thermal expansion properties of the alloys. The addition of proper amount of tungsten reduced the coefficient of thermal expansion and increased the mechanical properties of alloy both at room temperature and at high temperature. Reducing the amount of molybdenum and increasing the amount of tungsten were helpful to reduce the coefficient of thermal expansion of the alloys at high temperature and improved the performance consistency of the coefficient of thermal expansion from low to high temperature.