Strengthening of Additively Manufactured Tungsten by Use of Hydrogen in Argon Shielding Gas
Document Type
Article
Publication Date
1-2023
Abstract
Additively manufactured tungsten was printed in atmospheres of pure argon and argon-3% hydrogen and compared on the basis of microstructure, chemical composition, and three point bend tests. The argon-3% hydrogen atmosphere refined microstructure and markedly increased flexural strength, achieving a maximum of 985 MPa. Chemical composition analysis revealed high levels of oxygen in argon-3% hydrogen parts compared to pure argon. It is proposed that the argon-3% hydrogen atmosphere aided the formation of tungsten oxides and slowed their sublimation. These oxides likely led to grain refinement by grain boundary pinning. The grain refinement produced a ribbon-like microstructure which resulted in higher strength transgranular fracture.
Source Publication
International Journal of Refractory Metals and Hard Materials (ISSN 0263-4368)
Recommended Citation
Kemnitz, R. A., Eckley, C. C., Sexton, B. M., & LeSieur, A. R. (2023). Strengthening of additively manufactured tungsten by use of hydrogen in argon shielding gas. International Journal of Refractory Metals and Hard Materials, 110, 105970. https://doi.org/10.1016/j.ijrmhm.2022.105970
Comments
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Funding note: This research was supported by the Materials and Manufacturing and Aerospace Systems directorates of the Air Force Research Laboratories.