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Method and system for rapidly predicting tensile strength of Ni3Al reinforced alloy in long-term thermal exposure state

A technology of tensile strength and heat exposure, applied in the direction of applying stable tension/pressure to test material strength, strength characteristics, measuring devices, etc., can solve the problems of prolonging the cycle of material development, increasing the time cost of new materials, and time constraints

Active Publication Date: 2021-07-06
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the heat exposure test and tensile test are not complicated, they need a long time to obtain the relevant properties due to time constraints, which greatly increases the time cost of new material development
At present, the determination of the tensile strength of samples after long-term heat exposure relies on a large number of long-term tests, which greatly prolongs the cycle of material development

Method used

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  • Method and system for rapidly predicting tensile strength of Ni3Al reinforced alloy in long-term thermal exposure state
  • Method and system for rapidly predicting tensile strength of Ni3Al reinforced alloy in long-term thermal exposure state
  • Method and system for rapidly predicting tensile strength of Ni3Al reinforced alloy in long-term thermal exposure state

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Experimental program
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Effect test

Embodiment 1

[0049] The alloy used in this implementation is a Fe-Ni based alloy, the content of the main strengthening phase Ni3Al in the grain is about 15%, and the precipitation temperature is about 930°C. Carry out 500, 1000, 3000, 5000 and 10000h heat exposure experiments on the alloy at 700 and 750°C respectively, and carry out 500, 1000, 3000, 5000h heat exposure experiments at 800°C, and establish the heat exposure time t, temperature T and Ni3Al phase average diameter The relationship between the three image 3 shown. Using this formula to calculate, it is found that when the alloy is subjected to a heat exposure test at 820°C for 72h, the scanning photo of its Ni3Al phase is as follows figure 1 As shown, the average diameter of the Ni3Al phase and the scanning photo of the Ni3Al phase after a long-term heat exposure experiment at 700°C / 10000h are as follows figure 2 As shown, the average diameter of the Ni3Al phase of the two is equivalent. Accordingly, tensile samples unde...

Embodiment 2

[0051] The alloy used in this implementation is a Fe-Ni based alloy, the content of the main strengthening phase Ni3Al in the grain is about 20%, and the precipitation temperature is about 950°C. The alloy was subjected to 1000 and 3000h thermal exposure experiments at 700 and 750°C, respectively, and 10, 30, and 100h thermal exposure experiments were carried out at 820°C, respectively, and the thermal exposure time t, temperature T and average diameter of Ni3Al phase were established The relationship between the three Figure 4 shown. Using this formula to calculate, it is found that the average diameter of Ni3Al phase is equivalent to the average diameter of Ni3Al phase after 750 °C / 1000h long-term heat exposure test when the alloy is subjected to 46h heat exposure test at 820 °C. Accordingly, tensile samples under the conditions of 820°C / 46h and 750°C / 1000h were prepared respectively, and their tensile properties at 700°C were tested. The results showed that the tensile s...

Embodiment 3

[0053] The alloy used in this implementation is a Fe-Ni based alloy, the content of the main strengthening phase Ni3Al in the grain is about 20%, and the precipitation temperature is about 950°C. The alloy was subjected to 1000 and 3000h thermal exposure experiments at 700 and 750°C, respectively, and 10, 30, and 100h thermal exposure experiments were carried out at 820°C, respectively, and the thermal exposure time t, temperature T and average diameter of Ni3Al phase were established The relationship between the three Figure 4 shown. Using this formula to calculate, it is found that the average diameter of Ni3Al phase after 16h heat exposure test at 820°C is equivalent to the average diameter of Ni3Al phase after 700°C / 100h long-term heat exposure test. Accordingly, tensile samples under the conditions of 820°C / 16h and 700°C / 1000h were prepared respectively, and the tensile properties at room temperature were tested. The room temperature tensile strength corresponding to ...

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Abstract

The invention provides a method and a system for rapidly predicting the tensile strength of the Ni3Al reinforced alloy in the long-term thermal exposure state, which are reasonable in design, convenient to implement, rapid and efficient in detection and capable of meeting the current test requirements. The method comprises the following steps: selecting a substitute sample with the same Ni3Al phase average diameter as a target sample according to a pre-established intrinsic relationship among thermal exposure temperature, time, Ni3Al phase average diameter and tensile strength, and carrying out a room-temperature or high-temperature tensile test to obtain the tensile strength of the substitute sample as the tensile strength of the target sample, the tensile strength of the long-term thermal exposure state can be quickly predicted, wherein the target sample is a sample thermally exposed for a long time at a relatively low temperature, the thermal exposure temperature of the substitute sample is higher than the temperature of the target sample, and the thermal exposure time is short.

Description

technical field [0001] The invention relates to the technical field of heat treatment and mechanical properties of metal materials, in particular to a method and system for quickly predicting the tensile strength of a Ni3Al reinforced alloy in a long-term heat exposure state. Background technique [0002] Tensile strength is the critical value for the transition of metal from uniform plastic deformation to local concentrated plastic deformation, and it is also the maximum bearing capacity of metal under static tensile conditions. Since the tensile strength represents the maximum bearing capacity of an actual machine part under static tensile conditions, and is easy to measure and has good reproducibility, it is one of the important mechanical performance signs of metal materials in engineering and is widely used as a product specification or quality indicator. control indicators. For metal materials used in power stations, the tensile strength after long-term heat exposure ...

Claims

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Application Information

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IPC IPC(8): G01N3/18
CPCG01N3/18G01N2203/0003G01N2203/0017G01N2203/0075G01N2203/0226
Inventor 党莹樱杨征张醒兴尹宏飞袁勇谷月峰鲁金涛严靖博张鹏
Owner HUANENG POWER INTERNATIONAL
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