NICKEL-BASED DEFORMED HIGH-TEMPERATURE ALLOY HAVING HIGH ALUMINUM CONTENT AND PREPARATION METHOD THEREFOR

摘要

Provided is a nickel-based deformed high-temperature alloy having a high aluminum content and a preparation method therefor. Conventional Ni-Co-Cr components as matrix elements, the contents of alloy elements, especially the Al content of a solid solution strengthening phase γ' phase forming element, are increased, and the content of a strengthening phase γ' phase is increased to 55%-65%, so as to effectively improve the temperature bearing capability of the alloy. The appropriate addition of element Nb to the alloy can improve the stability of the γ' phase, thereby improving the performance of a casting-forging process, the reduction of the addition of element Cr can improve the long-term structural stability of the alloy at 850°C, and a high content of element Al can make up for the loss of surface stability caused by the decrease of element Cr. In addition, a dual process or triple process is used for the preparation and processing of an alloy raw material. The obtained nickel-based deformed high-temperature alloy solves the problem that there is no high-performance wheel forging material that can be used for a long time at 850℃, especially has excellent 850℃ tensile strength, yield strength and endurance life.