CN-121830733-B - Method for generating radiation hardening coefficient and method for evaluating radiation hardening

CN121830733BCN 121830733 BCN121830733 BCN 121830733BCN-121830733-B

Abstract

The invention discloses a method for generating an irradiation hardening coefficient and a method for evaluating irradiation hardening, and relates to the technical field of irradiation hardening. The coefficient generation method comprises the steps of performing ion irradiation on a test sample, simulating according to ion irradiation parameters to obtain an irradiation damage depth distribution map, performing nanoindentation test on the test sample subjected to the ion irradiation and a control sample of the test sample to obtain a first load displacement curve of the test sample and a second load displacement curve of the control sample, obtaining a first simulated load displacement curve and a second simulated load displacement curve according to the first load displacement curve and the second load displacement curve, obtaining a first elastoplastic transformation point and a second elastoplastic transformation point according to the first load displacement curve, the first simulated load displacement curve and the second simulated load displacement curve, and obtaining an irradiation hardening coefficient according to the first elastoplastic transformation point, the second elastoplastic transformation point and the irradiation damage depth distribution map. Thus, the radiation hardening can be quantitatively evaluated.

Inventors

ZHOU HAISHAN
LI YANGYANG
LI YU
LUO GUANGNAN

Assignees

中国科学院合肥物质科学研究院
聚变新能(安徽)有限公司

Dates

Publication Date: 20260508
Application Date: 20260310

Claims (9)

1. A method of generating an irradiation hardening coefficient, the method comprising: performing ion irradiation on a test sample, and simulating according to ion irradiation parameters to obtain an irradiation damage depth distribution map of the test sample; Respectively carrying out nanoindentation test on the test sample subjected to the ion irradiation and a control sample of the test sample to obtain a first load displacement curve of the test sample and a second load displacement curve of the control sample; obtaining a first simulated load displacement curve according to the first load displacement curve, and obtaining a second simulated load displacement curve according to the second load displacement curve; obtaining a first elastoplastic transformation point according to the first load displacement curve and the first simulated load displacement curve, and obtaining a second elastoplastic transformation point according to the second load displacement curve and the second simulated load displacement curve; Obtaining an irradiation hardening coefficient according to the first elastoplastic transformation point, the second elastoplastic transformation point and the irradiation damage depth distribution map; The obtaining a first simulated load displacement curve according to the first load displacement curve includes: selecting a first preset number of first data points from the elastic part of the first load displacement curve, and obtaining a third load and a first indentation depth according to the first data points; obtaining a first effective Young's modulus according to the third load and the first indentation depth; obtaining the first simulated load displacement curve according to the first effective Young's modulus; The obtaining a second simulated load displacement curve according to the second load displacement curve includes: selecting a second preset number of second data points from the elastic part of the second load displacement curve, and obtaining a fourth load and a second indentation depth according to the second data points; obtaining a second effective Young's modulus according to the fourth load and the second indentation depth; and obtaining the second simulated load displacement curve according to the second effective Young modulus.
2. The method of generating an irradiation hardening coefficient according to claim 1, wherein the obtaining a first elastoplastic transformation point from the first load displacement curve and the first simulated load displacement curve comprises: Acquiring a first target point with the largest abscissa among points with equal abscissas and ordinates on the first load displacement curve and the first simulated load displacement curve, and taking the first target point as the first elastoplastic transformation point; and obtaining a second elastoplastic transformation point according to the second load displacement curve and the second simulated load displacement curve, wherein the method comprises the following steps: and acquiring a second target point with the largest abscissa among points with equal abscissas and ordinates on the second load displacement curve and the second simulated load displacement curve, and taking the second target point as the second elastoplastic transformation point.
3. The method of generating an irradiation hardening coefficient according to claim 1, wherein the obtaining an irradiation hardening coefficient from the first elastoplastic transformation point, the second elastoplastic transformation point, and the irradiation damage depth distribution map includes: Acquiring a first load corresponding to the first elastoplastic transformation point and a first elastic penetration depth of a pressure head, and acquiring a second load corresponding to the second elastoplastic transformation point and a second elastic penetration depth of the pressure head; Obtaining a first critical shear stress according to the first load and the first elastic penetration depth, and obtaining a second critical shear stress according to the second load and the second elastic penetration depth; and obtaining the radiation hardening coefficient according to the first critical shear stress, the second critical shear stress and the radiation damage depth distribution map.
4. The method of generating a radiation hardening coefficient according to claim 3, wherein the obtaining the radiation hardening coefficient from the first critical shear stress, the second critical shear stress, and the radiation damage depth distribution map includes: obtaining critical shear stress variation according to the first critical shear stress and the second critical shear stress, and obtaining first irradiation damage of the test sample according to the irradiation damage depth distribution map; and obtaining an irradiation hardening coefficient according to the critical shear stress variation and the first irradiation damage.
5. The method of generating an irradiation hardening coefficient according to claim 3, wherein the first critical shear stress and the second critical shear stress are obtained according to the following formula: , , Wherein, the For the first critical shear stress described above, For the second critical shear stress, P1 is the first load, P2 is the second load, For the first elastic penetration depth, For the second elastic penetration depth, For a first effective radius of the portion of the indenter in contact with the test sample, A second effective radius of the portion of the ram in contact with the control sample.
6. The method of generating an irradiation hardening coefficient according to claim 4, wherein the obtaining the first irradiation damage of the test sample according to the irradiation damage depth distribution map includes: acquiring the occurrence depth of elastoplastic transformation of the test sample after the ion irradiation; substituting the elastoplastic transformation occurrence depth into the irradiation damage depth distribution map to obtain the first irradiation damage.
7. The method of generating an irradiation hardening coefficient according to claim 3, wherein the first effective young's modulus and the second effective young's modulus are obtained according to the following formula: , , Wherein, the For the purpose of the third load to be applied, For a third elastic penetration depth, For said first effective young's modulus, For a first effective radius of the portion of the indenter in contact with the test sample, , For the first depth of the indentation to be described, In order to perform the nanoindentation test using a nanoindenter that is displaced due to the load frame compliance, For the fourth load to be applied, For said second effective young's modulus, For a second effective radius of the portion of the ram in contact with the control sample, For a fourth elastic penetration depth, , Is the second indentation depth.
8. The method of generating an irradiation hardening coefficient according to claim 4, wherein the irradiation hardening coefficient is obtained according to the following formula: , Wherein, the For the said radiation hardening coefficient(s), For the purpose of the first irradiation damage, In order to change the amount of hardness, , For the critical shear stress variation, i.e = 。
9. A method of evaluating radiation hardening, the method comprising: acquiring a second irradiation damage of the object to be evaluated; Obtaining an evaluation result of the radiation hardening of the object to be evaluated according to the second radiation damage and the radiation hardening coefficient, wherein the radiation hardening coefficient is a coefficient generated according to the radiation hardening coefficient generation method of any one of claims 1 to 8.

Description

Method for generating radiation hardening coefficient and method for evaluating radiation hardening Technical Field The invention relates to the technical field of radiation hardening, in particular to a radiation hardening coefficient generation method and a radiation hardening evaluation method. Background With the development of fission and fusion stacks, there is an increasing demand for research into structural materials capable of withstanding high-dose neutron irradiation (> 100 dpa). In order to simulate the neutron irradiation environment of a reactor, ion irradiation has become a common means for simulating neutron irradiation damage due to its high efficiency, low cost and no residual radioactivity. Since the damaged layer caused by ion irradiation is shallow, nanoindentation technology is often used to evaluate hardening behavior, however, the stress field penetrates through multiple irradiation level damaged areas during indentation, and quantitative evaluation of irradiation hardening is difficult to realize. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. For this purpose, the radiation hardening coefficient generation method of the present invention supports quantitative evaluation of radiation hardening. A second object of the present invention is to propose a method for evaluation of radiation hardening. In order to achieve the above purpose, an embodiment of the first aspect of the present invention provides an irradiation hardening coefficient generation method, which includes performing ion irradiation on a test sample, simulating according to ion irradiation parameters to obtain an irradiation damage depth distribution map of the test sample, performing nanoindentation test on the test sample after the ion irradiation and a control sample of the test sample respectively to obtain a first load displacement curve of the test sample and a second load displacement curve of the control sample, obtaining a first simulated load displacement curve according to the first load displacement curve, obtaining a second simulated load displacement curve according to the second load displacement curve, obtaining a first elastoplastic transformation point according to the first load displacement curve and the first simulated load displacement curve, obtaining a second elastoplastic transformation point according to the second load displacement curve and the second simulated load displacement curve, and obtaining an irradiation hardening coefficient according to the first elastoplastic transformation point, the second elastoplastic transformation point and the irradiation damage depth distribution map. According to the method for generating the radiation hardening coefficient, the radiation hardening is quantitatively evaluated through generating the radiation hardening coefficient. In addition, the method for generating the radiation hardening coefficient according to the embodiment of the invention can also have the following additional technical characteristics: According to one embodiment of the invention, the method for obtaining the first elastoplastic transformation point according to the first load displacement curve and the first simulated load displacement curve comprises the steps of obtaining a first target point with the largest abscissa among points with the same abscissa and the same ordinate on the first load displacement curve and taking the first target point as the first elastoplastic transformation point, and obtaining a second elastoplastic transformation point according to the second load displacement curve and the second simulated load displacement curve comprises the steps of obtaining a second target point with the largest abscissa among points with the same abscissa and the same ordinate on the second load displacement curve and taking the second target point as the second elastoplastic transformation point. According to one embodiment of the invention, the obtaining the irradiation hardening coefficient according to the first elastoplastic transformation point, the second elastoplastic transformation point and the irradiation damage depth distribution map comprises the steps of obtaining a first load corresponding to the first elastoplastic transformation point and a first elastic penetration depth of a pressure head, and obtaining a second load corresponding to the second elastoplastic transformation point and a second elastic penetration depth of the pressure head; obtaining a first critical shear stress according to the first load and the first elastic penetration depth, obtaining a second critical shear stress according to the second load and the second elastic penetration depth, and obtaining the irradiation hardening coefficient according to the first critical shear stress, the second critical shear stress and the irradiation damage depth distribution map. According to one embodiment of