A kind of preparation method of casting superalloy spectroscopic analysis internal control standard

Abstract

The invention belongs to the technical field of chemical analysis of superalloys, and particularly relates to a preparation method of an internal control standard sample for spectroscopic analysis of cast superalloys. The method mainly includes the following steps: (1) determining the batching point of the alloy according to the element mass percentage range of the superalloy, and preparing a master alloy ingot by using a vacuum furnace for high temperature melt treatment; (2) using a directional solidification furnace to make the master alloy ingot A directional solidification sample is prepared by secondary remelting, and processed into a sample of a certain size; (3) The sample is subjected to a homogenization heat treatment to improve the uniformity of the composition. The invention obtains a sample with uniform and stable composition by controlling the temperature gradient G, casting temperature, drawing speed and other parameters at the front of the solidification interface during the directional solidification process, and processes the surface of the sample to obtain an internal control standard sample. The method of the invention has the advantages of simple and easy realization, short cycle, uniform and stable components, high product qualification rate, and greatly reduces the component segregation degree of the samples prepared by the traditional method.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis of superalloys, and particularly relates to a preparation method of an internal control standard sample for spectroscopic analysis of cast superalloys. Background technique [0002] Superalloys have high temperature strength, good plasticity and fracture toughness, excellent creep resistance and fatigue properties, and good oxidation hot corrosion resistance, and become indispensable materials for aero-engine and gas turbine blades. The element composition and content of superalloys are one of the key factors that determine their properties. At present, spectroscopic analysis is an important means to detect the chemical composition of superalloys. The most commonly used spectrometers are X-ray fluorescence spectrometers, photoelectric direct-reading spectrometers, etc. Spectrometers rely heavily on spectral analysis standard samples or internal control standard samples in the process of...

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Problems solved by technology

[0003] At present, most of the methods for preparing superalloy spectroscopic analysis standard samples or internal control standard samples are: using a vacuum furnace to prepare master alloy ingots, directly cutting materials on the master alloy ingots for processing, and obtaining samples with appropriate sizes as internal control standard samples. This method is simple and easy to operate, but for high-temperature alloys with high alloying degree, it is difficult to control the composition uniformity, the product qualification rate is low, and the accuracy and reliability of the test results cannot be guaranteed.

[0004] Powdery and crumb standard samples can be obtained by grinding, screening, mixing and other steps to obtain standard samples with uniform composition, but the standard samples of superalloy spectral analysis, especially X-ray fluorescence spectral analysis and photoelectric direct reading spectral analysis The size has certain requirements, so it is difficult to use this method to prepare superalloy spectroscopic analysis standard samples or internal control standard samples

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