A large-size high-niobium high-temperature 706 alloy ingot and its smelting process

A technology of alloy ingot and superalloy, which is applied in the field of large-size, high-niobium, high-temperature 706 alloy ingot and its smelting process, and can solve the problems of fluctuation of smelting parameters, injection, and inability to completely eliminate quality defects in a consumable remelting process. To achieve the effect of improving melting stability

Active Publication Date: 2022-05-24
BEIJING CISRI GAONA TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of large-sized electroslag ingots by double-arm exchange electrode remelting method is easy to form a series of quality defects such as injection, flow steel, composition fluctuations and inclusions during the electrode exchange process, even after subsequent high-temperature diffusion annealing And electrode forging can not completely eliminate the above quality defects
In the subsequent vacuum consumable remelting process, when smelting to the electrode joint, the above-mentioned quality defects will cause fluctuations in the smelting parameters of the consumable remelting process, and the 706 alloy with a high degree of alloying has a great influence on the consumable remelting process parameters. Very sensitive, parameter fluctuations can easily produce smelting defects such as black spots and white spots, which will affect the metallurgical quality of consumable ingots

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This example is used to illustrate the method for preparing 706 alloy (1050mm diameter consumable ingot).

[0043] Target 706 alloy composition (by mass percent):

[0044] 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.

[0045] The specific preparation method is as follows:

[0046] Vacuum induction melting: According to the designed alloy composition requirements, 50% of the returned material is weighed according to the required elements of the alloy per unit weight, 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 composition of the molten steel is detected. By adding new metal, the Ni content in the molten steel is controlled to be about 42.0wt%, the Nb content is about 3.02wt%, and the Ti content is about 1.80 wt%, the Al c...

Embodiment 2

[0056] This example is used to illustrate the method for preparing 706 alloy (1050mm diameter consumable ingot).

[0057] Target 706 alloy composition (by mass percent):

[0058] C 0.011%, Cr 16.2%, Ni 42.2%, Nb 2.88%, Ti 1.60%, Al 0.18%, Si 0.02%, Mn 0.02%, P 0.008%, S 0.0004%, Co 0.01%, Mo 0.02% , B 0.003%, Cu 0.05%, Ca 0.001%, N0.0045%, O 0.0025%, Fe balance.

[0059] The specific preparation method is as follows:

[0060] Vacuum induction melting: According to the designed alloy composition requirements, 50% of the returned material is weighed according to the required elements of the alloy per unit weight, 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 composition of the molten steel is detected. By adding new metal, the Ni content in the molten steel is controlled to be about 42.5wt%, the Nb content is about 2.92wt%, and the Ti content is about 1.6...

Embodiment 3

[0070] This example is used to illustrate the method for preparing 706 alloy (1050mm diameter consumable ingot).

[0071] Target 706 alloy composition (by mass percent):

[0072] C 0.015%, Cr 16.6%, Ni 40.0%, Nb 3.18%, Ti 1.51%, Al 0.10%, Si 0.01%, Mn 0.15%, P 0.007%, S 0.0005%, Co 0.03%, Mo 0.03% , B 0.005%, Cu0 0.04%, Ca 0.002%, N0.004%, O 0.003%, Fe balance.

[0073] The specific preparation method is as follows:

[0074] Vacuum induction melting: According to the designed alloy composition requirements, 60% of the returned material is weighed according to the required elements of the alloy per unit weight, 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 1350 °C. After melting, the composition of the molten steel is detected. By adding new metal, the Ni content in the molten steel is controlled to be about 40.5wt%, the Nb content is about 3.2wt%, and the Ti content is about 1.57 ...

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Abstract

The invention discloses a large-size high-niobium high-temperature 706 alloy ingot and its smelting process, which are used to solve the problem of serious burning loss of Al and Ti elements in the existing smelting process and the high-niobium high-temperature 706 alloy ingot easily produced Metallurgical defects of black and white spots. The smelting process includes: vacuum induction smelting, making multiple vacuum induction ingots with the same composition, and then making the same number of electroslag electrodes, using (CaF 2 ‑CaO‑Al 2 o 3 ‑TiO 2 ) quaternary slag, exchange electroslag remelting, and then use the obtained electroslag ingot to make a consumable electrode, and then use the consumable electrode as the starting material to carry out two vacuum consumable remelting. This process can realize the preparation of large-size ingots of high-niobium high-temperature 706 alloys with an ingot weight of more than 15 tons and a diameter of more than 800mm, which can minimize the formation of black spots and white spots and reduce the burning rate of Al and Ti elements.

Description

technical field [0001] The invention relates to the technical field of large-sized high-niobium alloys, and more particularly, to a large-sized high-niobium high-temperature 706 alloy ingot and its smelting process. Background technique [0002] 706 superalloy is a special alloy. By adding elements (chromium, tungsten, molybdenum, etc.) different in size from the base metal atom (such as nickel) in the raw material, the distortion of the matrix metal lattice is caused. Alloy matrix stacking fault energy elements (such as cobalt) and elements that can slow down the diffusion rate of matrix elements (tungsten, molybdenum, etc.) are added to strengthen the matrix. Through aging treatment, the second phase (γ', γ", carbide, etc.) can be precipitated from the supersaturated solid solution to strengthen the alloy. The structure of the γ' phase is the same as that of the matrix, which is a face-centered cubic structure, and the lattice constant is the same as The matrix is ​​close...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02C22C1/02C22B9/18C22F1/00
CPCC22C33/02C22C30/00C22C30/02C22C19/058C22C19/056C22C1/023C22B9/18C22F1/10Y02P10/25
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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