A kind of nickel base casting alloy and preparation method thereof

A casting alloy and nickel-based technology, which is applied in the fields of nickel-based casting superalloy, nickel-based casting alloy and its preparation, high-temperature load-bearing structural parts, and air intake structural parts, and can solve the problem of not fully meeting the requirements of high-temperature structural parts of ramjet engines and other issues, to achieve high-temperature oxidation resistance and room temperature tensile properties, high temperature-bearing capacity and durability, and to improve work reliability and performance levels

Active Publication Date: 2021-04-09
BEIJING CISRI GAONA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, due to the difference between the working conditions and structure and the aircraft engine, the existing Mar-M002 alloy composition, casting process, and heat treatment process do not fully meet the requirements for the use of high-temperature structural parts of ramjet engines. More than 1200℃, service time more than 2000s"

Method used

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  • A kind of nickel base casting alloy and preparation method thereof
  • A kind of nickel base casting alloy and preparation method thereof
  • A kind of nickel base casting alloy and preparation method thereof

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preparation example Construction

[0027] The method for preparing the above-mentioned nickel-based casting alloy provided by the present invention comprises: sequentially mixing and melting alloy raw materials, refining and pouring molding under vacuum conditions.

[0028] In the method of the present invention, the vacuum condition may be a condition with a vacuum degree of 10Pa or less (such as 5-10Pa).

[0029] In the method of the present invention, the mixed melting and refining can be carried out in a conventional manner, but preferably, the mixed melting and refining method is as follows: when the vacuum degree is lower than 10Pa, the power transmission starts, the power transmission power is 25-35KW, and the alloy raw material After full melting, reduce the power to 15-25KW for refining until the molten steel surface is clean and free of film. When the molten steel temperature is about 20-30°C higher than the alloy pouring temperature, power off and measure the temperature. Mixed melting and refining c...

Embodiment 1-3

[0036] (1) prepare alloy raw material according to the composition shown in table 1;

[0037] (2) Put the alloy raw material prepared above into the crucible of the vacuum induction furnace, pump the vacuum to below 10Pa and start power transmission, the power transmission power is 30KW, after the alloy raw material is fully melted, reduce the power to 20KW and refine until the molten steel surface is clean and free of film , When the temperature of the molten steel is about 25°C higher than the pouring temperature of the alloy, the power is cut off to measure the temperature, and the power transmission power is 10KW for pouring molding. The pouring molding temperature is 1480°C, and the mold shell temperature is 900°C; heat treatment at 870°C for 16 hours, and nickel can be obtained. base cast alloy ingots. figure 1 Typical low-magnification (×200 times) microstructure of the alloy obtained in Example 1, figure 2 It is a typical structure of the dendritic stem γ′-strengthen...

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Abstract

The invention belongs to the technical field of new materials, and provides a nickel-based casting alloy and a preparation method thereof, which are mainly applied to high-temperature load-bearing structural parts of ramjet engines whose wall surface temperature reaches 1200°C, such as air intake structural parts. The alloy composition contains C: 0.1‑0.25%, Cr: 7.5‑10.7%, Co: 8‑12%, W: 8‑12%, Al: more than 6.25%, Ti: 0.75‑2%, Ta: 2‑3%, Hf: 0.8‑2.5%, Zr: 0.01‑0.15%, B: 0‑0.2%, and the remainder is matrix element Ni and impurity elements. The nickel-based casting alloy of the invention is produced by investment casting method, and after being subjected to standard heat treatment at 870°C / 16h, it has higher temperature bearing capacity and durability than similar casting superalloys.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a nickel-based cast alloy and a preparation method thereof, in particular to a nickel-based cast superalloy with excellent ultra-high temperature mechanical properties, which is mainly used in the high-temperature load-bearing structure of a ramjet whose wall surface temperature reaches 1200°C Components, such as intake duct structures. Background technique [0002] Since the concept of hypersonic flight was proposed in the 1960s, countries all over the world have been competing to develop hypersonic technology, and their focus has always been on high-temperature components with complex structures, mainly hypersonic ramjet engines. In order to meet the needs of continuous upgrading of engine thrust-to-weight ratio, the structure and materials of key high-temperature alloy parts have undergone tremendous changes, and the structure has developed towards the overall and hollow d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10
CPCC22C1/023C22C19/056C22F1/10
Inventor 袁晓飞尹三强吴剑涛陈兴福李维
Owner BEIJING CISRI GAONA TECH
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