Rhenium-Free Heat-Resistant Nickel Alloy for the Cast Blades Production

Based on the use of calculation and analytical methods for forecasting phase and structural stability, the heat-resistant nickel alloyHeat-resistant nickel alloy 3MI-M5 chemical composition has been developed. This alloy does not contain rhenium but contains an increased amount of tantalum and tungsten (8.5% at the average level) and is intended for manufacturing of cast working bladesBlade by the method of directional crystallizationDirectional crystallization. Developed alloy after heat treatmentHeat treatments under the regime foreseen for modern IV generation alloys provides a tensile strengthTensile strength above 1300 MPa with satisfactory ductility (more than 6.0%) at a temperatureTemperature of 20 °C, as well as time to failure at a test temperatureTemperature of 975 °C and a load of 300 MPa 60…90 h, which meets the requirements for the serial alloy ЖC32-BI and it is much less expensive.