Preparation method of low-oxide-inclusion high-performance powder metallurgy nickel-base superalloy

Abstract

The invention provides a preparation method of a low-oxide-inclusion high-performance powder metallurgy nickel-base superalloy, and belongs to the field of metal materials. The preparation method comprises the steps that firstly, spherical prealloyed powder is prepared from the components by adopting a vacuum gas atomization powder processing technology in percentage by mass: 0.16-0.19% of C, 9.8-12% of Cr, 16.5-17.5% of Co, 7.7-8.8% of W, 0.65-0.88% of Mo, 5.75-6.30% of Al, 0.025-0.033% of B, 0.055%-0.087% of Zr, and the balance of of Ni; then the prealloyed powder with certain granularity and TiH2, TaH and HfH2 powder with certain content and granularity are selected for being uniformly mixed; a mixture is loaded in a rubber covering sleeve for cold isostatic compaction; then the rubbercovering sleeve is removed and a formed green body is placed in a high vacuum hot-pressing furnace for hot-pressing sintering compactness according to a certain sintering process; then the compact sintered green body is forged or rolled according to the requirement to obtain workblank parts; and finally, the parts are subjected to timeliness treatment. By adopting the preparation method of the low-oxide-inclusion high-performance powder metallurgy nickel-base superalloy, the oxygen content of prepared nickel-base superalloy materials is low, and high endurance strength and high low-cycle fatigue can be obtained.

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.