Preparation process of nickel-based high temperature alloy with high-content refractory elements

A technology of nickel-based superalloy and preparation process, applied in the direction of improving process efficiency, improving energy efficiency, etc., can solve the problems of component segregation, abnormal tissue heredity, etc. The effect of secondary shrinkage

Active Publication Date: 2019-06-21
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The purpose of the present invention is to provide a process for preparing nickel-based superalloys with high content of refractory elements, which effectively solves the problems of composition segregation and abnormal tissue inheritance of nickel-based superalloys with high content of refractory elements, and prepares Superalloys with good mechanical properties

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  • Preparation process of nickel-based high temperature alloy with high-content refractory elements
  • Preparation process of nickel-based high temperature alloy with high-content refractory elements
  • Preparation process of nickel-based high temperature alloy with high-content refractory elements

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Embodiment 1

[0044] In this example, a high-W alloyed nickel-based superalloy was prepared by the VIM+ESR process. The composition of the alloy ingredients is shown in Table 1, wherein the W element is a refractory element with a content of 16wt.%. In this embodiment, an alloy material ingot (master alloy ingot) is firstly prepared by a vacuum induction melting process, and then electroslag remelting (ESR) is performed on the master alloy ingot to obtain the nickel-based superalloy with a high content of refractory elements; the The process specifically includes the following steps:

[0045] (1) Feeding to ensure stable carbon alloying and preliminary deoxidation:

[0046] Clean the inside of the crucible, add carbon element raw materials to the bottom of the crucible, then add all other element raw materials (cobalt, chromium, nickel, niobium, hafnium) except aluminum, titanium and W, and finally add refractory element W to the upper part of the crucible It is added in the form of master...

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Abstract

The invention discloses a preparation process of a nickel-based high temperature alloy with high-content refractory elements, and belongs to the technical field of alloy preparation. According to theprocess, a vacuum induction melting (VIM) and electroslag remelting (ESR) process is adopted for preparing the alloy containing the high-content refractory elements. During the vacuum induction melting stage, by controlling the feeding mode, increasing the refining temperature, prolonging the refining time, accelerating the solidification rate and the like, the segregation phenomena of refractorymetal and low-density alloy elements are effectively suppressed, and the composition uniformity of upper and lower parts of a parent alloy ingot is improved. Through electroslag remelting, secondary shrinkage in the alloy ingot is eliminated, the impurity content is reduced, and the metallurgical quality is improved. The preparation process can significantly reduce the microsegregation and macrosegregation phenomena of the high-content refractory elements and can effectively reduce the content of harmful gas elements such as O and N in the high-temperature alloy, the purity of the alloy is improved, the degree of segregation of the high-specific gravity elements is reduced, the heredity of alloy anomalous tissues is improved, and the overall mechanical properties of the alloy are improved.

Description

technical field [0001] The invention relates to the technical field of alloy preparation, in particular to a preparation process of a nickel-based superalloy with high content of refractory elements. Background technique [0002] Nickel-based superalloys have been widely used in key hot-end components of aero-engines and gas turbines. As the service conditions become increasingly harsh, service materials are required to have higher temperature bearing capacity. High alloying (including W, Ta and other elements) is An effective way to improve the thermal strength of materials has been widely accepted by metallurgists. With the increase of alloying degree and refractory metal elements, the segregation of elements in the alloy will be aggravated, which will affect the uniformity of the composition and structure of the master alloy. At present, the smelting method of casting superalloys in my country is mainly based on vacuum induction melting. The equipment is a vacuum smeltin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C1/03C22B9/18
CPCY02P10/25
Inventor 谢君侯桂臣仉凤江王振江荀淑玲周亦胄孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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