Preparation process of a nickel-based superalloy with high content of refractory elements

A nickel-based superalloy and preparation process technology, applied in the direction of improving process efficiency, improving energy efficiency, etc., can solve problems such as abnormal compositional segregation, tissue heritability, etc. The effect of the uniform problem

Active Publication Date: 2021-01-26
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 a nickel-based superalloy with high content of refractory elements
  • Preparation process of a nickel-based superalloy with high content of refractory elements
  • Preparation process of a nickel-based superalloy with high content of 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 superalloy with high content of refractory elements, and belongs to the technical field of alloy preparation. The process adopts vacuum induction melting (VIM) + electroslag remelting (ESR) process to prepare alloys with high content of refractory elements. During vacuum induction melting, by controlling the feeding method, increasing the refining temperature and prolonging the refining time, and accelerating the solidification rate, etc., the segregation of refractory metals and low-density alloy elements can be effectively suppressed, and the composition uniformity of the upper and lower parts of the master alloy ingot can be improved. Electroslag remelting eliminates secondary shrinkage cavities in alloy ingots and reduces impurity content to improve metallurgical quality. The invention can not only significantly reduce the micro-segregation and macro-segregation of high-content refractory elements, but also effectively reduce the content of harmful gas elements such as O and N in superalloys, thereby improving the purity of the alloy and reducing the degree of segregation of high-density elements. Improve the heredity of the abnormal structure of the alloy and improve the comprehensive mechanical properties of the alloy.

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 Patents(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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