|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Environmental Degradation of Additively Manufactured Alloys
||Evaluation of Hydrogen Diffusivity, Uptake, and Trapping in Additively Manufactured 17-4 PH Stainless Steel and Possible Consequences Towards Stress Corrosion Cracking
||Lauren Singer, Zachary D. Harris, John R. Scully
|On-Site Speaker (Planned)
Hydrogen-metal interactions, such as production, uptake, diffusion, and trapping, can greatly influence the degree of stress corrosion cracking of a material; therefore, evaluation of H interactions in additively manufactured stainless steels is critical in corrosion performance and failure analysis. This work aims to quantify bulk hydrogen behavior of selectively laser melted 17-4 PH stainless steels compared to their wrought counterparts. Electrochemical permeation was used to assess effective hydrogen diffusivity and hydrogen concentration for each condition; the impact of surface effects was examined through specimen thickness variation. Microstructural trapping was investigated through thermal desorption spectroscopy. The barnacle electrode technique and LECO hydrogen testing were used to evaluate diffusible H concentration and total hydrogen uptake, respectively. Results indicate a four- to fivefold increase in global effective diffusivity in additively manufactured versus wrought material, with the usual relationship between temper and hydrogen interactions preserved; possible impacts on stress corrosion cracking are addressed.
||Additive Manufacturing, Environmental Effects,