Achieving fully-equiaxed fine β-grains in titanium alloy produced by additive manufacturing. Issue 1 (2nd January 2023)

• Record Type: Journal Article
• Authors: Xue, Aitang; Lin, Xin; Wang, Lilin; Lu, Xufei; Yuan, Lukai; Ding, Hanlin; Huang, Weidong
• Is Part Of: Materials research letters. Volume 11:Issue 1(2023)
• Page Start: 60
• Page End: 68
• Publication Date: 2023-01-02
• Subjects: Additive manufacturing -- titanium alloy -- grain refinement -- fully-equiaxed β-grains -- microstructure; 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: 10.1080/21663831.2022.2115323
• Languages: English
• ISSNs: 2166-3831

Abstract

Abstract : The achievement of fine equiaxed β grain with conventional intragranular (α-Ti+β-Ti) microstructure in additive manufacturing titanium alloy remains a big challenge. We conquer this challenge by synergistically controlling β-grains during both solidification and subsequent thermal-cycles of laser directed energy deposition (DED), and a solution + quenching heat-treatment. Both the strength and plasticity of heat-treated Ti6Al4V3Ni0.05B are superior to those reported new DED titanium alloy and comparable to that of DED Ti6Al4V, because of the fine-equiaxed β-grains with intragranular (α-Ti+β-Ti) microstructure. These findings provide new insight into the grain structure control and the composition design of AM titanium alloy. GRAPHICAL ABSTRACT: UF0001 IMPACT STATEMENT: The synergetic control of β-grain during both solidification and subsequent thermal-cycling is essential for achieving fully-equiaxed fine β-grains in additively manufactured titanium alloys.