Method for representing single-crystal Ni-base alloy creep resistance

A technology for creep properties and base alloys, which is applied in the field of research on the mechanical properties of superalloys, and can solve the problems that there is no simple and effective method for describing the creep curve of single crystal Ni-based alloys.

Inactive Publication Date: 2016-07-20
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Judging from the literature reported at home and abroad, there is no simple and effective method to describe the creep curve of single crystal Ni-based alloys.

Method used

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  • Method for representing single-crystal Ni-base alloy creep resistance
  • Method for representing single-crystal Ni-base alloy creep resistance
  • Method for representing single-crystal Ni-base alloy creep resistance

Examples

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Comparison scheme
Effect test

example 1

[0108] Example 1. Characterization of the creep properties of DD3 single crystal Ni-based alloys with different orientations

[0109] DD3 single crystal Ni-based alloy is a cost-effective single-crystal Ni-based alloy independently developed by my country. As shown in Table 1, the creep curve model ε=β is used 0 +β 1 ln(t+1)+β 2 exp(β 3 t) Obtain [001] orientation DD3 single crystal Ni-based alloy at 1040°C / 137MPa, 1040°C / 180MPa and [111] orientation alloy at 1040°C / 137MPa, 1070°C / 137MPa, 1040°C / 180MPa and [011] orientation alloy Creep parameter β at 1040℃ / 137MPa i (i=0,1,2,3) value, calculated creep rate, measured creep rate, maximum strain and creep life. Among them, the creep fitting curves of [001] orientation alloy at 1040°C / 137MPa, 1040°C / 180MPa and [111] orientation alloy at 1040°C / 180MPa are as follows figure 1 As shown, the comparison between the corresponding calculated creep rate curve and the measured creep rate curve is as follows figure 2 shown. visible:...

example 2

[0118] Example 2. Characterization of creep properties of a [001] orientation rhenium-free single crystal Ni-based alloy

[0119] Using this creep curve model, the parameters of the creep curve of a [001]-oriented rhenium-free single crystal Ni-based alloy at 1040°C / 80MPa for 3000h are obtained: β 0 = 0.0615, β 1 = 0.1017, β 2 =0.0206,β 3 =-0.0091. ie beta 3 -5 % / h; at 3100h, the creep strain is only 0.75%, and the creep rate is only 3.28065×10 -5 % / h. The calculation results show that the strains at the early stage of creep and at the late stage of creep respectively meet: ε=0.1017ln(t+1)-0.0206exp(-0.0091t) and ε=0.1017ln(t+1); due to β 2 and |β 3 |The value is very small, therefore, the strain is basically dominated by ε=0.1017ln(t+1), and the creep rate variation trend is ε'=0.1017 / (t+1), β 1 Basically represents the creep performance of the alloy.

[0120] like Figure 4 (a) and (b) respectively show the creep fitting curve of the alloy creeping at 1040℃ / 80MPa f...

example 3

[0121] Example 3. Characterization of creep properties of a [001] orientation containing 4.5% Re single crystal Ni-based alloy under high temperature medium stress and medium temperature high stress conditions

[0122] The single crystal Ni base alloy containing 4.5% Re is a representative single crystal Ni base alloy. Table 2 shows the strain and creep life of the alloy at 1100oC / 137MPa and 830oC / 820MPa, as well as the creep parameter values ​​obtained by using this creep curve model, the calculated creep rate and its comparison with the measured creep rate. The corresponding creep fitting curve and creep rate curve are as follows: Figure 5 , 6 shown. visible:

[0123] (1) This model also describes the whole creep process of the alloy relatively completely, and the calculated creep rate is in good agreement with the measured creep rate, indicating that this model is still suitable for expressing the creep of single crystal Ni-based alloy containing 4.5% Re curve.

[012...

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Abstract

A method for representing single-crystal Ni-base alloy creep resistance comprises the steps of building a creep curve model suitable for single-crystal Ni-base alloy creep characteristics; determining model parameters to obtain a creep curve equation; performing creep data regression to obtain a fitting creep curve for describing a creep process; obtaining a creep rate equation, obtaining the minimum calculation creep rate and calculating a creep rate curve; combining specific requirements for representing the single-crystal Ni-base alloy creep resistance.Various single-crystal Ni-base alloy creep curves under constant temperature and constant stress except the extremely-high temperature or extremely-high stress and creep rate distribution can be accurately expressed; the corresponding relations of various creep curve equation items and creep parameters and alloy creep curves is revealed; the problem that some alloy cannot represent creep characteristics easily through the creep activated energy and stress indexes is solved; and the method is of great importance in further knowing the creep characteristics and rules of single-crystal Ni-base alloy.

Description

technical field [0001] The invention belongs to the field of research on the mechanical properties of high-temperature alloys, and relates to a method for characterizing the creep characteristics and rules of single-crystal Ni-based alloys. Background technique [0002] The research on the creep properties of single crystal Ni-based alloys has always been an important part of the strategy of strengthening the country. Establishing a model that conforms to the creep curve of single crystal Ni-based alloys and creating a mechanism and method to characterize the creep properties of single crystal Ni-based alloys are very important for the study of single crystal Ni-based alloys. The creep law of Ni-based alloys is very important, and it also meets the needs of big data and digital age. Over the years, people have been trying to find a method to accurately describe the creep curve, and expect to predict the creep properties of alloys through limited experimental data. So far, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/28
CPCG01N3/28
Inventor 尚丽娟鲍识同于兴福
Owner SHENYANG POLYTECHNIC UNIV
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