|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Characterization of a High Nb-TiAl Alloy Components Fabricated by Additive Manufacturing Using Electron Beam Melting
||Wenbin Kan, Junpin Lin, Yongfeng Liang, Hui Peng, Hongbo Guy
|On-Site Speaker (Planned)
A high Nb-TiAl alloy(Ti–45Al–8Nb, in at%) were processed by electron beam melting (EBM). This near-net-shape additive manufacturing process produces complex parts according to a CAD design. The formation of various types of microstructural defects, including banded structures caused by the vaporization of aluminum, was investigated with respect to different processing parameters and processing strategy. The microstructure, residual porosity and the chemical composition of the samples have been investigated both immediately after EBM and after high temperature insostatic pressing(HIP) or heat treatments(HT). To avoid both micro- and macro-cracks, the use of higher preheating temperatures and an intermediate reheating process (to reheat each solidified layer during EBM) was assessed in detail. In addition, the processing conditions for the production of a fine full lamellar microstructure were identified.
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