About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Additive Manufacturing: Processing, Microstructure and Material Properties of Titanium-based Materials
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Presentation Title |
Influence of Thermal Treatments on the Microstructure and Mechanical Properties of Ti-6Al-4V Built by Electron Beam Melting (EBM) |
Author(s) |
K.S.N. Sesha, Kenta Yamanaka, Kenta Aoyagi, Akihiko Chiba |
On-Site Speaker (Planned) |
K.S.N. Sesha |
Abstract Scope |
Effect of thermal treatments on the microstructure and mechanical properties of Ti-6Al-4V parts built by electron beam melting (EBM) additive manufacturing were investigated. As-built specimens were heat-treated at 800-980 °C for 2hrs followed by water quenching. As-built specimens showed acicular α phase with a small amount of β phase microstructure. The martensitic transformation from the β phase to α' phase at temperatures above 900 °C, while the retained β phase was observed after quenching from 800 °C and 850 °C. The improved yield strength and tensile strength were observed in specimens heat-treated above 900 ℃, while the lower yield strength and significant work-hardening and enhanced elongation-to-failure were attained in specimens heat-treated at 800 ℃ and 850 ℃. Formation of soft athermal α'' martensite and athermal ω phase was observed in specimen heat-treated at 850 ℃. The Correlation between phase formation and mechanical properties was studied in detail. |