|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Preparation and Electron Beam Welding of Hot Packed Rolled Powder Metallurgy γ-TiAl Sheets
||Zhengguan Lu, Lei Xu, Jie Wu, Ruipeng Guo, Rui Yang
|On-Site Speaker (Planned)
Atomized powder with a normal composition of Ti-47Al-2Cr-1.8Nb-0.15B (at. %) was used to prepare powder metallurgy (PM) γ-TiAl preforms through hot isostatic pressing. PM method can obtain a more uniform chemical composition and finer microstructure than traditional casting route. Considering the poor room-temperature ductility, hot packed rolling process was studied to prepare PM γ-TiAl sheets and electron beam welding (EBW) of gamma sheets was conducted. Experimental results show that the hot temperature deformation behavior of PM gamma alloy was sensitive to rolling parameters. A set of rolling parameters was optimized to prepare PM gamma sheets with 2.5mm thickness. The microstructure and microhardness of FZ, HAZ and BM is different after welding while no obvious element segregation was observed. The tensile strength of welding joint was also tested, and tensile testing specimens all fracture in the FZ.
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