Method for preparing high temperature resistant nickel base alloy

Abstract

The invention discloses a method for preparing high temperature resistant nickel base alloy. The nickel base alloy consists of the following components in percentage by weight: 26.0 to 28.0 percent of Cr, 5.3 to 5.7 percent of Co, 8.2 to 8.6 percent of Mo, 2.4 to 2.8 percent of W, 0.4 to 0.6 percent of V, 3.8 to 4.2 percent of Ta, 5.6 to 6.0 percent of Al, 1.3 to 1.7 percent of Ti, 2.1 to 2.5 percent of Nb, 0.004 to 0.006 percent of B, more than or equal to 0.1 percent and less than or equal to 0.4 percent of Cu, more than 0 percent and less than or equal to 0.08 percent of C, more than 0 percent and less than or equal to 0.3 percent of Si, more than 0 percent and less than or equal to 0.5 percent of Mn, and the balance of Ni; the method for preparing the high temperature resistant nickel base alloy comprises the following steps of: mixing the components of the alloy, smelting, controlling vacuum degree to be 0.01 to 0.1Pa, and fully melting all raw materials, and then keeping smelting power constant for 15 to 25 minutes; improving the vacuum degree to be about 0.001 to 0.01Pa, refining at the temperature of between 1,650 and 1,670 DEG C for 6 to 8 minutes, and adjusting the components to ensure that the components meet the requirement; adjusting temperature to be 1,600 to 1,620 DEG C, and pouring to obtain ingots; performing heat treatment, heating the cast ingots to be 1,250 to 1,270 DEG C, preserving heat for 3 to 5hours, performing air cooling to room temperature, heating to 1,140 to 1,160 DGE C, preserving heat for 3 to 5 hours, and performing air cooling to room temperature; and heating to 1,050 to 1,070 DEG C, preserving heat for 30 to 36 hours, and performing air cooling to room temperature.

Description

technical field [0001] The invention relates to the field of alloy metals, in particular to a method for preparing a high-temperature-resistant nickel-based alloy. Background technique [0002] Superalloys refer to a class of metal materials based on iron, nickel, and cobalt that can work for a long time at high temperatures above 600°C and under certain stresses. For half a century, the temperature before the turbine of the aero-engine has increased from 730°C in the 1940s to 1677°C. The increase in service temperature puts forward more and more stringent requirements on the materials of aero-engines. Nickel-based superalloys are by far the most superior performance and the most widely used aero-engine materials. At present, the upper limit temperature of the alloy's service temperature has reached about 1200 ° C, which is close to the melting point of the alloy, but it is still the material of choice for the key components with the highest temperature and the largest str...

AI Technical Summary

Problems solved by technology

[0006] Although many nickel-based superalloys for aero-engines have been developed in China, such as K403, K405, K441 and K417G alloys, the biggest disadvantage of these alloys is that the initial melting temperature and plasticity are quite different from those of cobalt-based superalloys. application of these alloys

Although intermetallic compounds have the characteristics of low specific gravity and high strength, their use is limited due to their poor plasticity and oxidation resistance.