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Method for judging surface segregation state of alloy and method for manufacturing alloy

A technology of alloy and state, applied in the direction of computer combined chemistry, chemical process analysis/design, etc., can solve the problems of inaccurate calculation, large difference, and whether segregation occurs on the surface of the material, and achieve high accuracy, small amount of calculation, and fast and accurately determine the effect of

Active Publication Date: 2019-01-25
BEIJING COMPO ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, at home and abroad, most of the control of material surface segregation through the design of alloy systems relies on empirical judgments, and it is impossible to ensure whether segregation occurs on the surface of materials through accurate calculation of alloy system design.
Only relying on empirical judgments has certain predictability for conventional steel, non-ferrous metals and other materials, but for the segregation control of new material systems, there are often problems with large differences between empirical judgments and actual results

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  • Method for judging surface segregation state of alloy and method for manufacturing alloy
  • Method for judging surface segregation state of alloy and method for manufacturing alloy

Examples

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Embodiment 1

[0033] A method for judging the surface segregation state of stainless steel Fe-Cr alloy and manufacturing stainless steel Fe-Cr alloy material. First, if figure 1 As shown, it is determined whether the surface segregation of the Fe-Cr alloy occurs and the elemental composition of the alloy is selected.

[0034] The design calculation method for determining whether surface segregation occurs in Fe-Cr alloy is:

[0035] W=E(Fe-Cr)-1 / 2[E(Fe-Fe)+E(Cr-Cr)], wherein, E(Fe-Cr)=75kJ / mol, E(Fe-Fe)=118kJ / mol mol, E(Cr-Cr)=152kJ / mol, calculated according to the formula: W=-60kJ / mol, that is, W<0, so it can be determined that element surface segregation will occur in Fe-Cr alloy. According to the comparison of the surface tension values ​​of the two elements, it can be seen that the surface tension of the Fe element is greater than that of the Cr element, so it can be determined that the surface segregation of the Fe element will occur in the Fe-Cr alloy.

[0036] In order to suppress...

Embodiment 2

[0040] A method for judging the surface segregation state of a silicon steel Fe-Si alloy and manufacturing a silicon steel Fe-Si alloy material. First, if figure 1 As shown, determine whether the surface segregation of Fe-Si alloy occurs and select the elemental composition of the alloy.

[0041] The design calculation method for determining whether surface segregation occurs in Fe-Si alloy is:

[0042] W=E(Fe-Si)-1 / 2[E(Fe-Fe)+E(Si-Si)], wherein, E(Fe-Si)=297kJ / mol, E(Fe-Fe)=118kJ / mol mol, E(Si-Si)=310kJ / mol, calculated according to the formula: W=83kJ / mol, that is, W>0, so it can be judged that the Fe-Si alloy will not segregate on the surface of elements.

[0043] Considering that in the Fe-Si silicon steel alloy, the surface tension of Fe is much greater than that of Si, and the iron oxide film formed at high temperature is poor in compactness, which easily leads to the problem of oxide film peeling off, it is necessary to add a third component to realize that this compon...

Embodiment 3

[0047] A method for judging the surface segregation state of Sn-Bi-Ag lead-free solder alloy used in the field of low-temperature soldering and manufacturing Sn-Bi-Ag lead-free solder alloy material. First, if figure 2 As shown, it is determined whether the surface segregation of the Sn-Bi-Ag alloy occurs and the elemental composition of the alloy is selected.

[0048] The design calculation method to determine whether the alloy has surface segregation is to calculate the following parameter values ​​respectively:

[0049] W1=E(Sn-Bi)-1 / 2[E(Sn-Sn)+E(Bi-Bi)],

[0050] W2=E(Sn-Ag)-1 / 2[E(Sn-Sn)+E(Ag-Ag)],

[0051] W3=E(Bi-Ag)-1 / 2[E(Bi-Bi)+E(Ag-Ag)], wherein, E(Sn-Bi)=180kJ / mol, E(Sn-Sn)=187kJ / mol, E(Bi-Bi)=196.6kJ / mol, E(Sn-Ag)=157kJ / mol, E(Ag-Ag)=162.9kJ / mol, E(Bi-Ag)=192kJ / mol, according to the formula Calculations can be obtained: W1=-11.8, W2=-17.95, W3=12.25. At this time, W3>0, W2<W1<0, so it can be judged that the surface segregation of Ag element in this alloy will...

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Abstract

The invention relates to a method for judging the surface segregation state of an alloy and a method for manufacturing an alloy material. According to the method for judging the surface segregation state of the alloy and the method for manufacturing the alloy material, aiming at a specific material system, the surface segregation state of the alloy is judged, the element composition of the alloy is selected for manufacturing, aiming at the alloy required to realize material surface segregation modification, the proper element addition types can be screened and calculated for manufacturing, andaiming at an alloy system required to inhibit surface segregation, an element type combination capable of inhibiting surface segregation can be screened for manufacturing. The method for judging thesurface segregation state of the alloy and the method for manufacturing the alloy material have the advantages that the surface segregation state of the alloy can be conveniently and accurately judged, and the specific system alloy capable of regulating and controlling the material surface segregation state can be manufactured.

Description

technical field [0001] The invention belongs to the technical field of material surface modification engineering, and in particular relates to a method for determining and regulating the alloy system of material surface segregation. Background technique [0002] Segregation is the main reason affecting the uniformity of material composition. Material segregation generally manifests as grain boundary segregation, surface segregation, etc. The segregation phenomenon in the material has advantages and disadvantages during the use of its processed products. For example, severe grain boundary segregation will cause brittle materials to fracture along the grain boundary. If it occurs in aircraft bodies, automobile engines, pressure vessels, nuclear reactors and other components, It will cause great harm; but in some special applications, the use of material segregation can be used to modify the material, such as using surface segregation to change the oxidation resistance and cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/10G16C20/60C22C1/02
CPCC22C1/02
Inventor 张少明贺会军刘希学朱捷徐蕾王志刚赵朝辉张江松安宁温余苗林刚张富文师静琳
Owner BEIJING COMPO ADVANCED TECH
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