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Method for preparing nickel-based high-temperature alloy

A nickel-based superalloy and alloying technology, which is applied in the direction of improving energy efficiency and process efficiency, can solve the problems of low thermal processing performance of alloys, difficult to melt in a short time, and separate W-based alloys, and achieve good oxidation resistance. , The melting parameters are easy to control and the effect of shortening the melting time

Inactive Publication Date: 2014-08-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the impurity Ca concentration exceeds 80ppmw and the impurity Mg concentration exceeds 70ppmw, the hot workability of the alloy is extremely low
In addition, conventional smelting is intermediate frequency heating or resistance heating, and it is generally difficult to reach 3000°C. It is difficult to achieve short-term melting for W-based alloys; conventional smelting requires separate heat treatment equipment and processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of NS111 nickel-based superalloy comprises the following process steps:

[0026] The proportioning of NS111 nickel base superalloy in the present embodiment is as follows:

[0027] Ni: 35%; Cr: 23%; Fe: 40%; Cu: 0.5%; Mn: 1%; C: 0.05%; Si: 0.5%;

[0028] ①Material preparation: According to the proportion of NS111 alloy, add the alloying element metal raw materials Cr and Ti into the feeding funnel, and the rest of the elemental metal raw materials are placed in the water-cooled copper crucible of the electron beam melting furnace according to the proportion. During the whole preparation process, keep water-cooled The temperature of the copper crucible was 200°C.

[0029] ② Preheating: Close the door of the electron beam melting furnace, turn on the mechanical pump, Roots pump, and diffusion pump in sequence, so that the vacuum degree in the electron beam melting furnace is less than 5×10 -2 Pa, the vacuum degree of the electron gun chamber is le...

Embodiment 2

[0035] The preparation method of NS142 nickel base superalloy comprises the following process steps:

[0036] The proportioning of NS142 nickel base superalloy in the present embodiment is as follows:

[0037] Ni: 46%; Cr: 23.5%; Fe: 0.05%; C: 1%; Mn: 0.5%; Si: 3%; Cu: 3.5%; Mo: 0.2%; Al: 1.2%; Ti: 1.2%; P: 0.02%; S: 0.03%;.

[0038] ①Material preparation: according to the proportion of NS142 alloy, add the alloying element metal raw materials Cr, Mo, Ti into the feeding funnel, and put the rest of the elemental metal raw materials in the water-cooled copper crucible of the electron beam melting furnace according to the proportion. During the whole preparation process, Keep the water-cooled copper crucible at 200°C

[0039] ② Preheating: Close the door of the electron beam melting furnace, turn on the mechanical pump, Roots pump, and diffusion pump in sequence, so that the vacuum degree in the electron beam melting furnace is less than 5×10 -2 Pa, the vacuum degree of the e...

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PUM

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Abstract

The invention relates to a method for preparing nickel-based high-temperature alloy, belonging to the field of alloy preparation. The method for preparing the nickel-based high-temperature alloy is an electron-beam melting process and comprises the steps of placing metal raw materials, which play a role in alloying, in a feeding device of an electron-beam melting furnace; placing other metal raw materials in a water-cooled copper crucible of the electron-beam melting furnace. The alloy raw materials are placed in the water-cooled copper crucible and are melted by using an electron-beam melting technology; different from the conventional vacuum induction melting, a metal melt is in contact with water-cooled copper directly, so that other impurities can not be introduced during electron-beam melting.

Description

technical field [0001] The invention relates to a method for preparing a nickel-based superalloy, belonging to the field of alloy preparation. Background technique [0002] Nickel-based superalloys refer to austenitic superalloys with a nickel content of 40-65%. The alloy has certain high temperature strength, good thermal corrosion resistance and oxidation resistance under the condition of 730-1100 ℃, and is suitable for making guide vanes and nozzle guide vanes of aviation jet engines, industrial gas turbines, ship gas turbines and diesel engine nozzles. [0003] Unlike other superalloys, nickel-based superalloys are not strengthened by ordered precipitated phases firmly combined with the matrix, but are composed of an austenitic fcc matrix that has been solid-solution strengthened and a small amount of carbides distributed in the matrix. The pure nickel crystal is a close-packed hexagonal hcp crystal structure below 417 degrees, and transforms into an fcc crystal structu...

Claims

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Application Information

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IPC IPC(8): C22B9/22C22C1/02C22C19/03
CPCY02P10/25
Inventor 谭毅姜大川王登科石爽
Owner DALIAN UNIV OF TECH
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