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Preparation method for nickel-based high temperature alloy by using electron beam melting

A nickel-based superalloy and electron beam smelting technology, which is applied in the field of metallurgical purification, can solve the problems of difficulty in obtaining alloy composition, low production efficiency, and low energy utilization rate.

Inactive Publication Date: 2013-09-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The current nickel-based superalloys are mainly smelted in a multi-stage process, that is, under a certain smelting capacity, the smelting of the alloy is divided into multiple stages and carried out sequentially. Although this production method can obtain the required products, but the energy utilization rate is still very low, and the production efficiency is not high. At the same time, in the process of producing high-temperature alloys by the multi-link process, it is easy to make the alloy composition difficult to be guaranteed due to too many times of smelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The first step of polishing and cleaning high-purity raw materials: take the high-purity raw materials of each element contained in the Inconel 740 alloy, among which, the high-purity raw materials of each element are Ni with a purity of 99.98%, Cr with a purity of 99.98%, Mo with a purity of 99.95%, and Mo with a purity of 99.95%. 99.97% Co, 99.8% Nb, 99.7% Mn, 99.995% Ti, 99.999% Al, 99.6% Fe, 99.999% Si, 99.9% C and 94% In B, the high-purity raw materials of each element are mechanically polished to remove the oxide layer on the surface, and then placed in acetone, deionized water, and analytical pure alcohol for ultrasonic vibration cleaning to remove residual oil and dust on the surface , and finally dried, wherein, the purity is the mass fraction;

[0019] The second step is the proportioning of high-purity raw materials: the high-purity raw materials of each element after drying are proportioned according to the composition of Inconel 740 alloy, and the proportio...

Embodiment 2

[0022] The first step of high-purity raw material polishing and cleaning: take the high-purity raw materials of each element contained in the Inconel 740 alloy, wherein the high-purity raw materials of each element include Ni with a purity of 99.981%, Cr with a purity of 99.981%, and Mo with a purity of 99.952%. 99.971% pure Co, 99.83% pure Nb, 99.72% pure Mn, 99.9951% pure Ti, 99.9992% pure Al, 99.61% pure Fe, 99.9992% pure Si, 99.92% pure C and 94.3 % B, the high-purity raw materials of each element were mechanically polished to remove the oxide layer on the surface, and then placed in acetone, deionized water, and analytical pure alcohol for ultrasonic vibration cleaning to remove the residual oil and dirt on the surface. Dust, finally dried;

[0023] The second step is the proportioning of high-purity raw materials: the high-purity raw materials of each element after drying are proportioned according to the composition of Inconel 740 alloy, and the proportioning compositio...

Embodiment 3

[0026] The first step of high-purity raw material polishing and cleaning: take the high-purity raw materials of each element contained in the Inconel 740 alloy, wherein the high-purity raw materials of each element include Ni with a purity of 99.983%, Cr with a purity of 99.982%, and Mo with a purity of 99.954%. 99.972% pure Co, 99.88% pure Nb, 99.76% pure Mn, 99.9954% pure Ti, 99.9993% pure Al, 99.66% pure Fe, 99.9995% pure Si, 99.94% pure C and 94.7 % B, the high-purity raw materials of each element were mechanically polished to remove the oxide layer on the surface, and then placed in acetone, deionized water, and analytical pure alcohol for ultrasonic vibration cleaning to remove the residual oil and dirt on the surface. Dust, finally dried;

[0027] The second step is the ratio of high-purity raw materials: the high-purity raw materials of each element after drying are blended according to the composition of Inconel 740 alloy, and the ratio composition is: the mass fracti...

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Abstract

The invention especially relates to a preparation method for nickel-based high temperature alloy by using electron beam melting, which belongs to the field of metallurgical purification technology. The method comprises the following steps: taking high-purity raw materials respectively corresponding to each element included in Inconel 740 alloy; respectively polishing, cleaning and drying the high-purity raw materials; proportioning the dried high-purity raw materials according to composition of the Inconel 740 alloy; and finally, placing the proportioned high-purity raw materials in an electron beam melting furnace, heating the high-purity raw materials until the raw materials are fused, carrying out melting, closing electron beam current after completion of melting, cooling a melt to obtain an alloy ingot and removing an oxidation film on the top of the alloy ingot so as to obtain the Inconel 740 nickel-based high temperature alloy. According to the invention, through usage of the characteristics of high vacuum, high-energy density and the like of electron beam in vacuum melting and combined utilization of volatilization rules of elements under a vacuum condition, alloy components in a finished product are well controlled, and production efficiency is substantially improved while the purity of the high temperature alloy is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of metallurgical purification, and in particular relates to a method for preparing superalloys with electron beams. Background technique [0002] Nickel-based superalloys are an important class of indispensable materials for various high-temperature parts of aero-engines, aerospace rocket engines and industrial gas turbines. With the development of the aerospace industry, the current operating temperature of traditional nickel-based superalloys is close to the limit of the working temperature, such as cast and deformed nickel-based superalloys that use solid solution strengthening and precipitation strengthening as strengthening methods. It is difficult to greatly improve the creep resistance, and it is not suitable for working in high temperature and high stress environments, and its density is relatively high, generally 8.0–8.5g / cm 3 Among them, it is difficult to achieve light weight to meet the require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/22C22C1/02C22C30/00
Inventor 谭毅石爽廖娇邹瑞洵
Owner DALIAN UNIV OF TECH
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