A method for rapid determination of incipient melting temperature of single crystal superalloys

A high-temperature alloy, rapid measurement technology, applied in the direction of measuring device, material thermal analysis, suspension and porous material analysis, etc., can solve the problems of low efficiency, long experimental period, difficult distinction, etc. Effect

Active Publication Date: 2021-07-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the heat treatment temperature control of the quenching metallographic method itself is single, and only one heat treatment temperature can be selected for the experiment each time, and the heat treated sample and the corresponding metallographic results at the fixed temperature are obtained, which leads to a long test period and low efficiency of the method
Moreover, the initial melting structure of superalloys is similar to the structure formed in the later stage of solidification. It is difficult to distinguish the two through metallographic results, and misjudgment is prone to occur.
However, the simulation calculation method requires a complete thermodynamic database to ensure the accuracy of the calculation results, which is currently difficult to meet the requirements for other high-temperature alloys except nickel-based

Method used

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  • A method for rapid determination of incipient melting temperature of single crystal superalloys
  • A method for rapid determination of incipient melting temperature of single crystal superalloys
  • A method for rapid determination of incipient melting temperature of single crystal superalloys

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Embodiment 1

[0056] The test object of this embodiment is a seven-element Co-Al-W-based single-crystal superalloy, and the seven-element Co-Al-W-based single-crystal superalloy is composed of Al, W, Ni, Ta, Ti, Cr and Co Composition, its composition is: the content of Al is 11%, the content of W is 4%, the content of Ni is 30%, the content of Ta is 1%, the content of Ti is 4%, the content of Cr is 5%, the balance For Co. The stated percentages are atomic percentages.

[0057] The concrete steps of the method for measuring the initial melting temperature of single crystal superalloy are:

[0058] Step 1, preparing alloy single crystal rod-shaped samples: firstly, use a vacuum induction melting furnace to prepare a master alloy with a composition that meets the requirements, and then use a seed crystal method and a directional solidification rapid solidification method to prepare a long single crystal rod-shaped sample, and the casting temperature is 1550 ° C. The pulling rate was 100 mm / s...

Embodiment 2

[0065] The alloy selected in this embodiment is the second-generation nickel-based single-crystal superalloy DD6. The document "Shi Zhenxue et al. published in the Chinese Journal of Nonferrous Metals, 2015.25 (11): 3077-3083 on the microstructure of DD6 single-crystal superalloys at different service temperatures The initial melting temperature of DD6 indicated in "Evolution Behavior" is 1325°C, so the temperature at the heating end is set to 1345°C, and the rest of the experimental process is consistent with that of Example 1.

[0066] The temperature of DD6 measured in Example 2 of the present invention is 1326.14°C, corresponding to the position X=24.5454, which is very close to the theoretical initial melting temperature in the literature.

[0067] The specific experimental parameters and data of Embodiment 1 and Embodiment 2 are shown in Table 1.

[0068] Concrete experimental parameters and data of table 1 embodiment 1 and embodiment 2

[0069]

[0070] It can be se...

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Abstract

The invention relates to the technical field of heat treatment of superalloys, in particular to a method for quickly measuring the initial melting temperature of single crystal superalloys. In the present invention, the microstructure at different heat treatment temperatures can be quickly obtained by performing continuous temperature gradient heat treatment on the single crystal superalloy sample to be tested, and the change of the porosity on the sample with the axial position can be analyzed after the temperature is measured at the temperature measuring point Curve and change curve of temperature with axial position, and then obtain the corresponding relationship between porosity and temperature, so as to determine the initial melting temperature of the alloy. The measurement method of the present invention has higher experimental efficiency and shorter experimental period.

Description

technical field [0001] The invention relates to the technical field of heat treatment of superalloys, in particular to a method for quickly measuring the initial melting temperature of single crystal superalloys. Background technique [0002] Single crystal superalloys are mainly used to manufacture aero-engines and gas turbine hot-end turbine blades, and their temperature-bearing capacity is a key technical indicator for improving engine performance, efficiency and reliability. Single crystal superalloys require heat treatment before use. However, with the continuous improvement of the performance requirements of single crystal superalloys, the degree of alloying is also getting higher and higher, which brings difficulties to the heat treatment process. The heat treatment process is mainly divided into solution treatment and subsequent aging treatment. The main purpose of solid solution treatment is to eliminate segregation and dissolve the main strengthening phase and eu...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01N15/08G01N25/00
CPCG01N15/088G01N25/00
Inventor郭敏王涛黄太文昌花婷张军刘林杨文超苏海军
OwnerNORTHWESTERN POLYTECHNICAL UNIV