High-intensity nickel based wrought superalloy and preparation method thereof

Abstract

The invention belongs to the technical field of nickel based wrought superalloy, and particularly relates to a high-intensity nickel based wrought superalloy and a preparation method thereof. The high-intensity nickel based wrought superalloy comprises the following main elements in percentage by mass: 10.0-25.0% of Cr, 10.0-20.0% of Co, 0.1-6.0% of Mo, 0.1-6.0% of W, 0.1-6.0% of Al, 0.1-6.0% of Ti, 0.05-1.5% of Nb, 0.1-2.0% of Fe, 0.001-0.10% of C, 0.001-0.05% of B, 0.01-0.1% of Zr, 0.001-0.10% of Ce, 0.001-0.10% of Mg, 0.01%-0.5% of Hf, and the balance Ni and inevitable impurity elements. The preparation method comprises the steps of preparing a high-purity cast ingot by vacuum induction smelting, electroslag remelting and vacuum self-consumption remelting; performing high-temperature diffusion to uniformly anneal the cast ingot under the temperature ranging from 1170-1190 DEG C; heating the annealed cast ion to reach the temperature of 1130-1160 DEG C, maintaining the temperature for 2-4h; then forging the cast ingot into a bar as required through a quick forging press, and thermally processing a bar sample to obtain the alloy material meeting the design demand.

Description

technical field [0001] The invention belongs to the technical field of nickel-based high-temperature alloys, and relates to a high-strength nickel-based deformed high-temperature alloy and a preparation method thereof. Background technique [0002] Compared with stainless steel and heat-resistant steel, high-temperature alloys are a type of material that has a high degree of alloying by adding various elements and can work for a long time above about 600 °C. According to the matrix, superalloys mainly include nickel-based superalloys, iron-based superalloys and cobalt-based superalloys. According to the forming process, they are generally divided into three categories, including deformed superalloys, casting superalloys and powder metallurgy superalloys. Nickel-based wrought superalloys have become indispensable key materials for aeroengine turbine disks, compressor disks and other rotating parts. GH4169 is a nickel-based deformed superalloy with a service temperature of 65...

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Problems solved by technology

Although powder metallurgy superalloys (such as FGH4097 alloy) are a material selection consideration for the manufacture of high-thrust ratio engine turbine disks in the future, due to the complex powder metallurgy process and long process flow, the high-temperature deformation process compared to the casting + forging deformation process route Alloy turbine discs are expensive to produce (Document 1: DevauxA, Helstroffer A, Cormier J, Villechaise P, Douin J, Hantcherli M and Pettinari-Sturmel F. Effect of aging heat-treatment on mechanical properties of AD730TM superalloy. 2014 8th International Symposium on Superalloy718and Derivatives, September 28–30, 2014, Pittsburgh, USA, pp.485-499; Literature 2: Raisson G. Evolution of PM nickel base superalloy processes and products. Powder Metallurgy, 2008, 51:10-13.)

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