Superfine crystal nickel-based high-temperature alloy and method for preparing same

Abstract

The invention provides an ultra-fine crystalline nickel base high-temperature alloy and a method for preparing the same, belonging to the high-temperature alloy steel field. The ultra-fine crystalline nickel base high-temperature alloy is particularly applicable to a high-temperature structural component which has high requirement to high-temperature strength and fatigue property, requires superplastic forming and has a complicated structure. The chemical compositions by weight percent of the ultra-fine crystalline nickel base high-temperature alloy are: 17 to 19 percent of Fe, 17 to 20 percent of Cr, 2.8 to 3.3 percent of Mo, 0 to 1.5 percent of W, 0.8 to 1.5 percent of Al, 0.3 to 1.3 percent of Ti, 4.7 to 5.7 percent of Nb, less than or equal to 0.015 percent of C, and the balance being Ni. The preparation method reasonably controls the parameter of a deformation process to allow the deformation temperature to be positioned in a grain boundary precipitated phase region and an austenite phase region which have higher solution temperatures, and uses powerful pinning action of a precipitated phase to the grain boundary to produce the ultra-fine crystalline alloy with a grade of grain fineness of between ASTM12 and ASTM13 grade. Compared with the prior art, the ultra-fine crystalline nickel base high-temperature alloy has simple alloy compositions, greatly reduces the resistance to deformation during forming, has small loss to forging and rolling equipment, and prevents crystal grains from growing when the ultra-fine crystalline nickel base high-temperature alloy is heated for a long time at a high temperature.

Description

technical field The invention belongs to the field of alloy steel for high temperature. It is especially suitable for high-temperature alloy parts with high requirements on grain size, especially high-temperature structural parts with high requirements on high-temperature strength and fatigue performance and complex structures requiring superplastic forming. Background technique The turbine disk is the core part of the engine of aviation and aerospace vehicles. Its working temperature is very high, and the temperature difference from the rim to the hub is very large. During the repeated start-up-stop process of the engine, the temperature changes sharply. , resulting in thermal fatigue. In addition, the rotation speed of the turbine rotor reaches 10,000 revolutions per minute or higher, and the mass of the rotating turbine disk produces a large centrifugal force, and the centrifugal force of the blades on the disk is also transmitted to the disk. The two superimpose, and th...

AI Technical Summary

Problems solved by technology

However, due to the complex composition of nickel-based superalloys, the deformation resistance of alloys below 1000 °C is quite high.

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