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A Differential Thermal Analysis Method for Measuring the Initial Melting Temperature of Single Crystal Superalloy

A high-temperature alloy and differential thermal analysis technology, applied in the investigation stage/state change, etc., can solve the time-consuming, laborious and inaccurate problems of the initial melting temperature of the alloy, and achieve good repeatability

Active Publication Date: 2021-10-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the fluctuation of furnace temperature and the false appearance of initial melting in the structure, the determination of the initial melting temperature of the alloy is time-consuming, laborious and inaccurate.

Method used

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  • A Differential Thermal Analysis Method for Measuring the Initial Melting Temperature of Single Crystal Superalloy
  • A Differential Thermal Analysis Method for Measuring the Initial Melting Temperature of Single Crystal Superalloy
  • A Differential Thermal Analysis Method for Measuring the Initial Melting Temperature of Single Crystal Superalloy

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Experimental program
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Embodiment 1

[0028] This embodiment is the mensuration of the initial melting temperature of DD414 single crystal alloy, and the process is as follows:

[0029] (1) Use standard materials to calibrate the temperature and sensitivity of the DSC instrument;

[0030] (2) Cut a cast disc sample with a diameter of 5mm and a thickness of 2.5mm, and clean it with ultrasonic waves for 20 minutes after the surface is polished. Before the sample test, do a baseline test. The experimental program is set as follows: a heating rate of 20°C / min Heating to 1100°C, heating to 1460°C at a heating rate of 10°C / min, holding for 5 minutes, cooling to 1100°C at a cooling rate of 10°C / min, and finally cooling to 200°C at a cooling rate of 20°C / min, the experiment is over. During the whole experiment process, high-purity Ar gas was used for protection, and the gas flow rate was 60ml / min. After weighing the sample, put it into the sample crucible, evacuate it for 3 times, use the sample and baseline test mode, a...

Embodiment 2

[0035] Present embodiment is the mensuration of DD425 alloy initial melting temperature, and process is as follows:

[0036] (1) Use standard materials to calibrate the temperature and sensitivity of the DSC instrument;

[0037](2) Cut out a disc sample with a diameter of 5 mm and a thickness of 2.5 mm, and clean the surface with ultrasonic waves for 20 minutes after the surface is polished. The baseline procedure is the same as that in Step 2 of Example 1. After weighing the sample, put it into the sample crucible, evacuate it for 3 times, use the sample and baseline test mode, and call the baseline test program to test the sample. The measured DD425 alloy cooling curve is as follows Figure 5 As shown, the measured alloy γ / γ′ eutectic solidification end temperature is 1260°C.

[0038] (3) Take a piece of as-cast sample and put it into a box-type resistance furnace for high-temperature heat treatment. The heat treatment temperature is 1280°C, and the holding time is 4 hours...

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Abstract

The invention discloses a differential thermal analysis method for measuring the initial melting temperature of a single crystal superalloy, and belongs to the technical field of single crystal superalloy analysis and detection. The method is to put a high-temperature heat-treated sample (reference sample without γ / γ′ eutectic) in the reference crucible, and put the as-cast sample (containing γ / γ′ eutectic) in the sample crucible. , use the DSC instrument to measure the compensation power-temperature curve between the reference sample and the as-cast sample in the sample heating process, and analyze the eutectic melting peak to accurately obtain the eutectic melting temperature of the single crystal alloy (that is, the initial melting temperature of the single crystal alloy temperature). The present invention adopts the DSC method to compare and measure the phase transformation of the reference sample and the as-cast sample when heated, which offsets the influence of the γ′ phase dissolution with a volume fraction of up to 60% in the single crystal superalloy on the γ / γ′ eutectic dissolution It overcomes the shortcomings of the traditional DSC test method that cannot obtain obvious eutectic melting peaks in the heating curve, and has the advantages of rapidity, accuracy and good repeatability.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection of single crystal superalloys, and in particular relates to a differential thermal analysis method for measuring the initial melting temperature of single crystal superalloys, which can quickly and accurately measure the initial melting temperature of single crystal superalloys. Background technique [0002] Single crystal superalloys are widely used as turbine blade materials for aero-engines and gas turbines due to their excellent high-temperature mechanical properties. Compared with the composition of polycrystalline superalloys, single crystal superalloys remove or reduce the addition of grain boundary strengthening elements, such as C, B, Zr, Hf, etc., and increase the initial melting temperature of single crystal superalloys. In crystallized superalloys, high-temperature solution heat treatment can be carried out to completely eliminate the γ / γ′ eutectic, thereby improving the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/04
CPCG01N25/04
Inventor 张少华谢光张功董加胜张健楼琅洪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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