A preparation method of low-oxide inclusion high-performance powder metallurgy nickel-based superalloy

Abstract

The invention discloses a method for preparing a low-oxide inclusion high-performance powder metallurgy nickel-based superalloy, which belongs to the field of metal materials. Firstly, the mass ratio of C: 0.16-0.19%, Cr: 9.8-12%, Co: 16.5-17.5%, W: 7.7-8.8%, Mo: 0.65-0.88%, Al : 5.75‑6.30%, B: 0.025‑0.033%, Zr: 0.055‑0.087%, the balance is spherical pre-alloyed powder of Ni, and then select pre-alloyed powder with a certain particle size and a certain content and particle size of TiH 2 , TaH and HfH 2 The powder is mixed evenly, and then put into the rubber sheath for cold isostatic pressing, and then the rubber sheath is removed, and the formed green body is placed in a high-vacuum hot-press furnace for hot-pressing sintering and densification according to a certain sintering process , and then the dense sintered body is forged or rolled as required to obtain rough parts, and finally the parts are subjected to aging performance treatment. By adopting the process of the invention, the prepared nickel-base superalloy material has low oxygen content, and can obtain high durable strength and high low-cycle fatigue strength.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a preparation method of a low-oxide inclusion high-performance powder metallurgy nickel-based superalloy. Background technique [0002] High-temperature alloys have good oxidation resistance, corrosion resistance, excellent tensile properties, durability, fatigue properties and long-term structural stability. They were developed to meet the requirements of modern aerospace technology under various high-temperature conditions. The field of advanced aerospace engines shows strong vitality. Powder metallurgy superalloy is a superalloy prepared by powder metallurgy. Compared with traditional casting and forging superalloys, it has the advantages of uniform structure, no macro segregation, high yield strength and good fatigue performance, and overcomes the segregation caused by conventional processes. (uneven), each particle of the pre-alloyed powder used is a "micro-steel ingot", and al...

AI Technical Summary

Problems solved by technology

The performance of powdered superalloys is closely related to the composition, particle size and oxygen content of raw material powders. Usually, finer powders are conducive to sintering and densification to obtain high performance. However, when the powders are finer, the surface of the powders adsorb The oxygen content is high, and the high oxygen content is easy to form oxide inclusions or oxide films on the surface of the powder and the strengthening elements such as Ti, Nb, Hf in the alloy, which is very detrimental to the low-cycle fatigue performance and high-temperature durability of the superalloy. Therefore, on the basis of optimizing the composition design, how to reduce the oxygen content of powder metallurgy superalloys to obtain high performance is a difficulty and hot spot in the preparation of powder superalloys at present.