A kind of master alloy and its preparation method and application

An intermediate alloy and alloy technology, applied in the field of metallurgy, can solve problems such as difficult operation, high alloy impurity content, and inability to meet the requirements of high-temperature alloy smelting raw materials, so as to improve production efficiency, uniform alloying, and improve defects such as segregation and inclusions Effect

Active Publication Date: 2020-01-17
BHN SPECIAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many kinds of raw materials in the batching process of this method, which is not easy to operate
The current master alloy is mostly prepared by one-step method (aluminothermic reduction reaction). Since this method is an out-of-furnace method, the prepared alloy has a relatively high impurity content, which cannot meet the requirements as a raw material for high-temperature alloy smelting.

Method used

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  • A kind of master alloy and its preparation method and application
  • A kind of master alloy and its preparation method and application
  • A kind of master alloy and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Concrete preparation process is as follows:

[0046] (1) Furnace making - sintering: using Al 2 o 3 Make the furnace material to make the crucible, and sinter in the sintering furnace at 850°C for 3 hours;

[0047] (2) Ingredients: mainly Fe or Fe 2 o 3 , Cr or Cr 2 o 3 , MoO x , Nb 2 o 5 , Al as raw material;

[0048] (3) Mixing: Put the raw materials into the V-shaped mixer and mix evenly;

[0049] (4) Furnace loading: put the mixed raw materials into the sintered crucible;

[0050] (5) Reaction: Calcium peroxide (CaO 2 ), fine aluminum (Al) and magnesium powder (Mg) are uniformly mixed, wrapped in paper as an igniter and placed on the top of the raw material, and the ignition starts a spontaneous reaction;

[0051] (6) cooling: natural cooling in the air for 5 hours;

[0052] (7) Furnace removal-weighing: the crucible is disassembled, the alloy ingot is taken out therefrom, and weighed;

[0053] (8) Finishing: use a grinder to remove the slag layer and ...

Embodiment 2～8

[0057] According to the method operation of embodiment 1, difference with embodiment 1 is: embodiment 2 adds K 2 Cr 2 o 7 To improve the heat of the overall reaction, the reaction is fully carried out; Embodiment 3~5 except using K 2 Cr 2 o 7 In addition to increasing the heat of reaction, part of Mg was used to replace Al to reduce metal oxides to increase the yield of oxides; in addition, the expected value of the content of each element and the expected value of the yield of each metal oxide were adjusted when designing the formula. Embodiment 6~8 adds TiO 2 . The details of each reaction system are shown in Table 1, and the analysis results are shown in Table 2.

[0058] Table 1. FeAlCrMoNbTi alloy reaction system

[0059]

[0060] Table 2. The main component list (wt.%) of the multi-element alloy of embodiment

[0061]

[0062] The second step adopts the vacuum induction melting method: batching, furnace loading, exhaust, argon filling, smelting, refining, c...

Embodiment 9

[0064] Concrete preparation process is as follows:

[0065] (1) Ingredients: the primary alloy produced by the first step of aluminothermic reduction reaction is used as the raw material for the second step of smelting, and 2wt% LaCe mixed metal is added as a desulfurizer;

[0066] (2) Furnace loading: first put half of the iron-aluminum-chromium-molybdenum-niobium-titanium (FeAlCrMoNbTi) alloy into the crucible, then put the mixed metal of lanthanum and cerium into the crucible, and finally put the rest of the alloy into the crucible;

[0067] (3) Exhaust: evacuate the vacuum induction furnace to 7.8 Pa, and use a small power of 5kw to bake the crucible to remove the attached gas;

[0068] (4) Argon filling-smelting: fill the vacuum induction furnace with argon to 10 kPa, slowly increase the power to 40kw to melt the alloy;

[0069] (5) Refining: Refining at 1700°C for 10 minutes, vacuuming again to remove the gas in the melt, and turning off the induction current after reac...

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Abstract

The invention belongs to the field of metallurgy, and relates to an intermediate alloy and a preparation method and application thereof. The alloy comprises Fe, Al, Mo, Nb, Cr and Ti. By reasonably designing the alloy components and contents, the proportions of the alloy elements in the final product can be better controlled, and alloying is improved. Smelting is carried out with a two-step method, and an alloy ingot with more accurate chemical components and high purity can be obtained. By the adoption of the method, the intermediate alloy which is low in cost, low in density and low in melting point, and has uniform components and low impurity element contents can be obtained, the material performance of prepared high-temperature alloy can be effectively improved, and the problems such as segregation and inclusion, generated during smelting, of the high-temperature alloy IN718 are solved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to an iron-aluminum-chromium-molybdenum-niobium-titanium (FeAlCrMoNbTi) master alloy and a preparation method and application thereof. Background technique [0002] Superalloys refer to a class of metal materials based on iron, nickel, and cobalt, which can resist oxidation or corrosion in a high temperature environment above 600°C, and can work for a long time under a certain stress. In the early 1950s, the International Nickel Corporation successfully developed the Inconel718 (IN718 for short) alloy. my country began to develop and form a similar brand GH4169 alloy in 1968. The alloy has good comprehensive properties in the temperature range of -253 ° C to 650 ° C. The yield strength below ℃ ranks first in the deformed superalloy, and it has fatigue, radiation resistance, oxidation resistance, corrosion resistance, good processing performance, welding performance and long-term organizationa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C30/00C22C27/06C22C19/05
CPCC22C1/023C22C1/03C22C19/051C22C27/06C22C30/00
Inventor 奥斯卡·罗伊德尔李庆莲杜剑雄姚武世刘志国
Owner BHN SPECIAL MATERIALS
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