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Method for preparing cobalt-based high-temperature alloy

A superalloy and cobalt-based technology, applied in the field of preparation of cobalt-based superalloys, can solve the problems of difficulty in melting W-based alloys in a short time, alone, and low thermal processing properties of alloys, and achieves easy control of melting parameters and reduction in average size. , the effect of improving longevity

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

[0027] The preparation method of GH159 cobalt-based superalloy comprises the following process steps:

[0028] The ratio of GH159 cobalt-based superalloy in the present embodiment is as follows:

[0029] C: 0.02%; Cr: 20%; Ni: balance; Co: 34%; Mo: 7%; Fe: 8%; Ti: 3%; Al: 0.3%; Nb: 0.6%; B: 0.02%; Mn: 0.1%; Si: 0.1%; P: 0.01%; S: 0.01%.

[0030] ①Material preparation: According to the ratio of GH159 alloy, add the alloying element metal raw materials Mo 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 ratio. During the whole preparation process, keep water-cooled The temperature of the copper crucible was 200°C.

[0031] 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 P...

Embodiment 2

[0037] The preparation method of GH605 cobalt-based superalloy comprises the following process steps:

[0038] GH605 cobalt-based superalloy proportioning in the present embodiment is as follows:

[0039] C: 0.1%; Cr: 19%; Ni: 10%; W: 15%; Co: balance; Mn: 1%; Fe: 2%; Si: 2%; P: 0.01%; S: 0.01%.

[0040] ①Material preparation: According to the proportion of GH605 alloy, add the alloying element metal raw materials W and Cr 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 is 200°C

[0041] 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...

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PUM

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Abstract

The invention relates to a method for preparing cobalt-based high-temperature alloy, belonging to the field of alloy preparation. The method for preparing the cobalt-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 cobalt-based superalloy, belonging to the field of alloy preparation. Background technique [0002] Cobalt-based superalloys refer to austenitic superalloys with a cobalt 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, cobalt-based superalloys are not strengthened by ordered precipitated phases firmly combined with the matrix, but are composed of an austenite fcc matrix that has been solid-solution strengthened and a small amount of carbides distributed in the matrix. The pure cobalt crystal has 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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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C19/07
Inventor 姜大川王登科谭毅石爽
Owner DALIAN UNIV OF TECH
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