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The Effect of Oxygen on Phase Equilibria in the Ti-V System: Impacts on the AM Processing of Ti Alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Materials Science and Engineering Division National Institute of Standards and Technology Gaithersburg, USA.ORCID iD: 0000-0003-4221-8510
2018 (English)In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, Vol. 70, no 9, p. 1692-1705Article in journal (Refereed) Published
Abstract [en]

Oxygen is always a constituent in “real” titanium alloys including titanium alloy powders used for powder-based additive manufacturing (AM). In addition, oxygen uptake during powder handling and printing is hard to control and, hence, it is important to understand and predict how oxygen is affecting the microstructure. Therefore, oxygen is included in the evaluation of the thermodynamic properties of the titanium-vanadium system employing the CALculation of PHAse Diagrams method and a complete model of the O-Ti-V system is presented. The β-transus temperature is calculated to increase with increasing oxygen content whereas the extension of the α-Ti phase field into the binary is calculated to decrease, which explains the low vanadium solubilities measured in some experimental works. In addition, the critical temperature of the metastable miscibility gap of the β-phase is calculated to increase to above room temperature when oxygen is added. The effects of oxygen additions on phase fractions, martensite and ω formation temperatures are discussed, along with the impacts these changes may have on AM of titanium alloys. 

Place, publisher, year, edition, pages
Minerals, Metals and Materials Society , 2018. Vol. 70, no 9, p. 1692-1705
Keywords [en]
Oxygen, Phase equilibria, Solubility, Temperature, Titanium compounds, Vanadium, Calculation of phase diagrams methods, Critical temperatures, Effect of oxygen, Formation temperature, Metastable miscibility gap, Powder handlings, Titanium alloy powders, Titanium-vanadium system, Titanium alloys
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236708DOI: 10.1007/s11837-018-3008-8ISI: 000441868700011Scopus ID: 2-s2.0-85049686045OAI: oai:DiVA.org:kth-236708DiVA, id: diva2:1259321
Note

Export Date: 22 October 2018; Article; CODEN: JOMME; Correspondence Address: Lindwall, G.; Department of Materials Science and Engineering, KTH Royal Institute of Technology, Brinellv. 23, Sweden; email: gretal@kth.se. QC 20181029

Available from: 2018-10-29 Created: 2018-10-29 Last updated: 2018-10-29Bibliographically approved

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