Smelting process of high-niobium high-temperature alloy large-size ingot and high-niobium high-temperature alloy large-size ingot

A high-temperature alloy, large-size technology, applied in the field of large-size ingots of high-niobium superalloys, can solve the problems of reducing the degree of element segregation, the ingot weight cannot be increased, and the ingot bursting, etc., to avoid thermal stress and structural stress.

Active Publication Date: 2020-11-03
BEIJING CISRI GAONA TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the deficiencies in the prior art, the first object of the present invention is to provide a smelting process for large-size ingots of high-niobium superalloys, which can effectively solve the problems caused by the expansion of the diameter or weight of large-size ingots of high-niobium superalloys. Segregation intensifies to form metallurgical defects of black spots and white spots, steel ingots burst due to high thermal stress, and the weight of st

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This example is used to illustrate the method for preparing 706 alloy (consumable ingot with a diameter of 1050mm).

[0049] Target 706 alloy composition (by mass percentage):

[0050] C 0.018%, Cr 15.8%, Ni 41.5%, Nb3.01%, Ti1.72%, Al 0.25%, Si0.02%, Mn0.01%, P0.006%, S0.0006%, Co0.02% , Mo0.01%, B0.004%, Cu0.02%, Ca0.004%, N0.005%, O0.002%, Fe balance.

[0051] The specific preparation method is as follows:

[0052]Vacuum induction smelting: According to the design alloy composition requirements, 50% of the elements required for the alloy per unit weight are weighed to return the material, and the rest is made of new metal raw materials. A 12-ton vacuum induction furnace is used, and the upper limit of the melting temperature is 1550°C. After melting, the molten steel composition is detected, and new metals are added to control the Nb content in the molten steel to about 3.02wt.%, the Ti content to about 1.80wt.%, and the Al content. About 0.30wt.%, according to th...

Embodiment 2

[0062] This example is used to illustrate the method for preparing 706 alloy (consumable ingot with a diameter of 1050 mm).

[0063] Target 706 alloy composition (by mass percentage):

[0064] C 0.011%, Cr 16.2%, Ni 42.5%, Nb2.80%, Ti1.57%, Al 0.15%, Si0.02%, Mn0.02%, P0.008%, S0.0004%, Co0.01% , Mo0.02%, B0.003%, Cu0.05%, Ca0.001%, N0.0045%, O0.0025%, Fe balance.

[0065] The specific preparation method is as follows:

[0066] Vacuum induction smelting: According to the design alloy composition requirements, 50% of the elements required for the alloy per unit weight are weighed to return the material, and the rest is made of new metal raw materials. A 12-ton vacuum induction furnace is used, and the upper limit of the melting temperature is 1550°C. After melting, the molten steel composition is detected, and new metals are added to control the Nb content in the molten steel to about 2.90wt.%, the Ti content to about 1.62wt.%, and the Al content. About 0.20wt.%, refined und...

Embodiment 3

[0080] This example is used to illustrate the method for preparing 718 alloy (diameter 1050mm consumable ingot).

[0081] The target 718 alloy composition is (by mass percentage):

[0082] C 0.015%, Cr 18.5%, Ni 53.5%, Nb5.05%, Ti0.92%, Al 0.55%, Si0.04%, Mn0.05%, P0.006%, S0.0008%, Co0.02% , Mo 2.95%, B0.004%, Cu0.05%, Ca0.001%, N0.0048%, O0.0024%, Fe balance.

[0083] The specific preparation method is as follows:

[0084] Vacuum induction smelting: According to the design alloy composition requirements, 40% of the elements required for the alloy per unit weight are weighed to return the material, and the rest is made of new metal raw materials. A 12-ton vacuum induction furnace is used, and the upper limit of the melting temperature is 1550°C. After melting, the molten steel composition is detected, and new metals are added to control the Nb content in the molten steel to about 5.08wt.%, the Ti content to about 0.97wt.%, and the Al content. About 0.60wt.%, refined for 40...

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Abstract

The invention discloses a smelting process of a high-niobium high-temperature alloy large-size ingot and the high-niobium high-temperature alloy large-size ingot. The problems that metallurgical defects of black spots and white spots are formed by anabatic segregation due to expansion of diameter or weight of the high-niobium high-temperature alloy large-size ingot, steel ingots are exploded due to large heat stress and the weight of the steel ingots cannot be increased due to the tonnage restriction of vacuum induction melting equipment are solved. The smelting process comprises the steps that that vacuum induction melting is carried out, a plurality of vacuum induction ingots with the same component are prepared, then electroslag electrodes with the same number are prepared, exchanging electroslag remelting is carried out, then prepared electroslag ingots are used for preparing consumable electrodes, and then the consumable electrodes are used as initial raw materials to perform multiple vacuum consumable remelting. By adopting the smelting process, the high-niobium high-temperature 706 alloy large-size ingot with the ingot weight of more than 15 tons and the diameter of more than 800mm can be prepared, the formation of the metallurgical defects of the black spots and the white spots is restrained to the utmost extent, the element segregation degree is reduced, and the steelingots are effectively prevented from being exploded.

Description

technical field [0001] The present invention relates to the technical field of high-niobium superalloy large-size ingot casting, more specifically, it relates to a high-niobium superalloy large-size ingot smelting process and the high-niobium superalloy large-size ingot produced by the smelting process . Background technique [0002] With the improvement of thermal efficiency and power of industrial gas turbines, the turbine disc material of advanced heavy-duty gas turbines above 200MW is gradually upgraded from alloy steel to superalloy. Compared with alloy steel, the yield strength of high-temperature alloys at 500°C is increased by more than 40%, and the durability strength at 550°C for 100,000h is increased by more than 300%, which can significantly improve the high-temperature strength and long-term durability of heavy-duty gas turbine wheels, which is conducive to simplifying the structure Designed to improve reliability and thermal efficiency of gas turbines. [000...

Claims

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Application Information

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IPC IPC(8): C22C30/02C22C19/05C22C1/02C22B9/18C22F1/10
CPCC22C30/02C22C19/056C22C1/023C22B9/18C22F1/10C22F1/002Y02P10/25
Inventor 黄烁赵光普张北江段然秦鹤勇李连鹏丑英玉齐超
Owner BEIJING CISRI GAONA TECH
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