High strength antithermal corrosion low segregation directional high temp alloy

Abstract

This invention relates to high-strength thermal abrasion resistance high-temperoducre alloy with low segregation and directional solidification properties. Its constitutions are (wt.%): Co9-12, Cr11-16, Mo1-3, W4-7, Al4-7, Ta4-7, Ti0-2, Re2-3, C0.01-0.15, 0.005-0.02 and Ni as the rest. The heat treatment for directional solidification steps are: 1240+-10deg.C for 0.5Hrs; 1260+-10deg.C for 0.5Hrs; 1280+-10deg.C for 4Hrs; air cooling to room temperature; 1120+-10deg.C for 4-1 Hrs; slow cooling to 1080+-10deg.C for 4Hrs; air cooling to room temperature; 900+-10deg.C; air cooling to room lemperature. This invention alloy can meet the requirement strength for design of turbine blade of aircraft engine but also has excellent thermal abrasion resistance property. The plane with the turbine blade of aircraft engine can be used for high altitude flight and flight in corrosion environment obove turbine blade of aircraft engine can be used for high altitude flight and flight in corrosion environment above sea.

Description

Technical field: [0001] The invention relates to the field of directional solidification superalloys, in particular to a high-strength thermal corrosion-resistant low-segregation directional superalloy and its directional solidification process and heat treatment method. Background technique: [0002] The performance of superalloys has increased with the development of gas turbines. The gas turbine is the most important part of the aircraft, which has the characteristics of advanced power plant, small weight and high power. Turbine blades are the most important parts of gas turbines, so the safety and stability of blades are crucial to the safe operation of gas turbines and aircraft. In the early days, gas turbines were mainly used in aviation; later they were gradually extended to sea and land. As the use environment changes, the requirements for blade materials also change. The high-temperature alloys used in aviation in the early days were applied to sea or land. The s...

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Problems solved by technology

However, the alloy has poor thermal corrosion resistance. Under the condition of high temperature corrosion of sodium salt, the material will be damaged in a relatively short period of time.

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