Nickel and cobalt-based high-temperature alloy containing rare earth elements and preparation method thereof

Abstract

The invention belongs to the field of nickel-based deformed high-temperature alloys, particularly relates to a nickel and cobalt-based high-temperature alloy containing rare earth elements and a preparation method thereof. The nickel and cobalt-based high-temperature alloy is mainly suitable for parts used at high temperature (700-750 DEG C) and under high stress such as turbine disks and blades of aircraft engines. The alloy comprises the following components in percentage by weight: 15-30 percent of Co, 11-17 percent of Cr, 4-6.5 percent of Ti, 1.0-3.0 percent of Al, 0.5-2.5 percent of W, 1-3 percent of Mo, 0-2 percent of Re, less than 0.1 percent of C, less than 0.1 percent of Zr, less than 0.1 percent of B, 0.01-0.5 percent of RE and the rest of Ni. The alloy is smelted with a vacuum induction furnace or a vacuum consuming furnace, is cast into a master alloy with chemical ingredients which are consistent with requirements and is thermally processed. The alloy has excellent processing performance, room temperature to high temperature tensile strength and equivalent durability to a high-performance cast and forged high-temperature alloy TMW.

Description

technical field [0001] The invention belongs to the field of nickel-based deformed superalloys, specifically a nickel-cobalt-based deformed superalloy containing rare earth elements and a preparation method thereof, and is mainly suitable for parts used under high temperature and high stress (700-750°C), such as aeroengines turbine disks and blades. Background technique [0002] In order to meet the ever-increasing performance requirements of aero-engines, the engine gas inlet temperature has increased from 1330°C in the 1970s to 1580-1680°C in the 1990s and 1730°C at the beginning of this century. As the core hot-end parts of the engine, the superalloy turbine blades and turbine disks must have continuously increasing temperature bearing capacity, which makes the manufacturing technology of superalloy blades and turbine disks one of the key technologies in the design and manufacture of modern aeroengines. In the next 5 to 10 years, the development of high thrust-to-weight ...

AI Technical Summary

Problems solved by technology

As the degree of alloying of the turbine disk continues to increase, severe segregation deteriorates the hot workability, lowers the low cycle fatigue performance, and easily expands fatigue cracks

At present, some advanced turbine disc alloys cannot be processed by traditional forging processes

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