Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 110, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2022.105970
Keywords
Tungsten; Selective laser melting; Hydrogen atmosphere; Tungsten oxide
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Additively manufactured tungsten in atmospheres of pure argon and argon-3% hydrogen was compared and analyzed based on microstructure, chemical composition, and three-point bend tests. It was found that the argon-3% hydrogen atmosphere resulted in a refined microstructure and significantly increased flexural strength. The presence of tungsten oxides in the argon-3% hydrogen parts likely contributed to grain refinement through grain boundary pinning, leading to higher strength transgranular fracture.
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
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