Journal
NONDESTRUCTIVE TESTING AND EVALUATION
Volume 38, Issue 4, Pages 683-699Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10589759.2023.2195647
Keywords
Hydrogen damage; hydrogen embrittlement; eddy current testing
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In this paper, a characterization method for the degradation degree of hydrogen-induced properties of materials based on eddy current response signal is proposed. An improved hydrogen diffusion and distribution analysis model was established, and an early hydrogen damage eddy current detection model for multilayer conductive structure materials was constructed. The relationship between the eddy current response signal and hydrogen embrittlement performance index is established.
Hydrogen diffuses in the material and accumulates in dislocations, holes, etc. which will lead to deterioration of the mechanical properties of the material and affect the health state of the structural parts of hydrogen service. In this paper, a characterisation method for the degradation degree of hydrogen-induced properties of materials based on eddy current response signal is proposed. Based on the semi-infinite planar source diffusion model and hydrogen permeation model, an improved hydrogen diffusion and distribution analysis model was established, and an early hydrogen damage eddy current detection model for multilayer conductive structure materials was constructed. The evolution of material properties under the action of hydrogen was analysed, and a linear relationship between hydrogen content and conductivity was obtained. The loss of elongation was selected as the damage index and the relationship between the eddy current response signal and hydrogen embrittlement performance index is established. Experiments verify that the eddy current response signal is sensitive to the performance index and increases with the intensification of hydrogen-induced performance degradation.
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