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Method for determining nickel-based single crystal high-temperature alloy residual segregation

A nickel-based single crystal, superalloy technology, applied in the analysis of materials, material analysis by optical means, material analysis by measuring secondary emission, etc., can solve the large difference in segregation, does not explain the residual segregation determination method, does not describe Residual segregation determination method, etc.

Active Publication Date: 2016-06-29
苏州高晶新材料科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] "JablonskiPD et al. published the document Homogenizing a Nickel-Based Superalloy: Thermodynamic and Kinetic Simulation and Experimental Results on Metallurgical & Materials Transactions B, 2009, 40 (2)" using Thermo-Calc and Dictra simulation to calculate the residual segregation of a Nimonic105 alloy, but its initial segregation is using Thermo-Calc software The Scheil model in , but the segregation obtained by this model is very different from the actual segregation, which will cause deviations in subsequent residual segregation calculations
[0004] "LiuG et al published the article Effects of Reand Ruonthesolidification characteristics of nickel-based single crystal superalloys in Metallurgical and Materials Transactions A, 2011, 42 (9), in which the lattice method was used to measure the residual segregation of a single crystal superalloy after heat treatment, but compared with the pure experimental method of simulation method will consume a lot of time and money
[0005] Chinese patent CN103276333A mentions the significance of reducing segregation in superalloys and a method for reducing residual segregation in superalloys, but does not describe the measurement method of residual segregation
[0006] U.S. Patent US20050217426A1 describes the influence of residual segregation on superalloys, but does not describe the determination method of residual segregation
[0007] U.S. Patent US20060016527A1 describes the influence of residual segregation on the incipient melting during heat treatment of superalloys, but does not describe the method of measuring residual segregation

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  • Method for determining nickel-based single crystal high-temperature alloy residual segregation
  • Method for determining nickel-based single crystal high-temperature alloy residual segregation
  • Method for determining nickel-based single crystal high-temperature alloy residual segregation

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Embodiment 1

[0044] This embodiment is a method for determining the residual segregation of nickel-based single crystal superalloy elements. The determination of residual segregation of nickel-based single crystal superalloy elements refers to the four most important segregation elements Al, Ta, W and Re in nickel-based single crystal superalloy.

[0045] In this embodiment, the residual segregation ratios of Al, Ta, W and Re are calculated.

[0046] The nickel-based single crystal superalloy is in cast state, composed of Cr, Mo, Al, Co, W, Re, Ta, Hf, C, B and Ni, and its nominal composition is: the content of Cr is 3.6%, the content of Mo The content of Al is 1.8%, the content of Al is 5.7%, the content of Co is 9%, the content of W is 6%, the content of Re is 4%, the content of Ta is 8%, and the balance is Ni. The stated percentages are all mass percentages.

[0047] The specific implementation steps of this embodiment are:

[0048] Step 1, preparing a metallographic sample: sampling...

Embodiment 2

[0075] This embodiment is a method for determining the residual segregation of nickel-based single crystal superalloy elements. The determination of residual segregation of nickel-based single crystal superalloy elements refers to the four most important segregation elements Al, Ta, W and Re in nickel-based single crystal superalloy.

[0076] In this embodiment, the residual segregation ratios of Al, Ta, W and Re are calculated.

[0077] The nickel-based single crystal superalloy is in cast state, composed of Cr, Mo, Al, Co, W, Re, Ta, Hf, C, B and Ni, and its nominal composition is: the content of Cr is 3.5%, the content of Mo The content of Al is 1.7%, the content of Al is 5.75%, the content of Co is 9.1%, the content of W is 6%, the content of Re is 4%, the content of Ta is 8%, and the balance is Ni. The stated percentages are all mass percentages.

[0078] The specific implementation steps of this embodiment are:

[0079] Step 1, preparing a metallographic sample: sampl...

Embodiment 3

[0106] This embodiment is a method for determining the residual segregation of nickel-based single crystal superalloy elements. The determination of residual segregation of nickel-based single crystal superalloy elements refers to the four most important segregation elements Al, Ta, W and Re in nickel-based single crystal superalloy.

[0107] In this embodiment, the residual segregation ratios of Al, Ta, W and Re are calculated.

[0108] The nickel-based single crystal superalloy is in cast state, composed of Cr, Mo, Al, Co, W, Re, Ta, Hf, C, B and Ni, and its nominal composition is: the content of Cr is 3.62%, the content of Mo The content of Al is 1.83%, the content of Al is 5.7%, the content of Co is 9%, the content of W is 6%, the content of Re is 4.1%, the content of Ta is 8%, and the balance is Ni. The stated percentages are all mass percentages.

[0109] The specific implementation steps of this embodiment are:

[0110] Step 1, preparing a metallographic sample: samp...

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Abstract

The invention provides a method for determining nickel-based single crystal high-temperature alloy residual segregation. By means of a manufactured metallographic specimen, primary dendrite distance of nickel-based single crystal high-temperature alloy is measured, and mass fraction distribution of all elements on all points of the nickel-based single crystal high-temperature alloy are measured on the manufactured metallographic specimen through a dot matrix method. The segregation directions of the elements are determined according to obtained mass fractions of the elements on the measurement points. A computer simulates solution treatment to obtain distribution of the elements after solution treatment, and accordingly the residual segregation ratios of Al, Ta, W and Re elements are obtained respectively. According to the method, experiments and simulation are combined so that residual segregation of the high-temperature alloy can be accurately and quickly predicted after solution treatment, cost of solution treatment research is reduced, and the period of solution treatment research is shortened. The mode that the mass fraction distribution of the elements on the points is obtained through the dot matrix method has the advantage of being large in specimen number, and result deviation caused by large errors in common representing methods is prevented.

Description

technical field [0001] The invention relates to the field of nickel-based superalloys, in particular to a method for simulating and calculating residual segregation of nickel-based superalloys. Background technique [0002] Nickel-based superalloys (hereinafter referred to as superalloys) are superalloys with good strength, creep resistance, oxidation resistance, and corrosion resistance at temperatures exceeding 650°C with nickel as the matrix (generally greater than 50%). In order to improve the temperature bearing capacity of the superalloy, the weak link of the grain boundary is eliminated, and a single crystal superalloy is developed. With the development of single crystal superalloys, refractory elements are gradually added to increase the solid solution strengthening effect and creep diffusion rate of the alloy to improve the high temperature mechanical properties of the alloy. During the solidification process of superalloys, due to the different segregation coeffic...

Claims

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Application Information

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IPC IPC(8): G01N21/84G01N23/22
CPCG01N21/84G01N23/22
Inventor 刘林张琰斌黄太文张军苏海军郭敏杨文超
Owner 苏州高晶新材料科技有限公司
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