Oxidation difference of microstructural bands in additive manufactured titanium alloy. Issue 1 (2nd January 2022)

• Record Type: Journal Article
• Authors: Fu, L. Q.; Yang, Z. W.; Wang, Y.; Ma, Z. Q.; Wang, Z. J.; Wang, D. P.
• Is Part Of: Materials research letters. Volume 10:Issue 1(2022)
• Page Start: 6
• Page End: 13
• Publication Date: 2022-01-02
• Subjects: Additive manufacturing -- titanium alloys -- oxidation -- heat-affected bands; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2021.2000515
• Languages: English
• ISSNs: 2166-3831

Abstract

Abstract : In this study, Ti6Al7Nb alloy produced by twin-wire arc additive manufacturing was oxidized at 800°C to identify the oxidation difference induced by heat-affected bands (HABs), which have been widely reported in additive manufactured titanium alloys. The oxidation kinetics proved that HABs with compact β laths have stronger oxidation resistance compared with that of the non-HAB zone. Nb element enriched in β phase promoted Ti3 Al to precipitate at the original position of β laths after oxidation, having a similar spacing to the β laths. The formation of compact Ti3 Al on HAB beneficially inhibits oxygen diffusion across the oxide scale/matrix interface. GRAPHICAL ABSTRACT: UF0001 IMPACT STATEMENT: Oxidation difference induced by microstructural bands in additive manufactured titanium alloy was identified, and the stronger oxidation resistance of heat-affected bands was attributed to the more compact β laths.