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Selective Electron Beam Melting of TiAl Alloy: Metallurgical Defects, Tensile Property, and Determination of Process Window
Author(s) -
Yue Hangyu,
Peng Hui,
Li Ruifeng,
Su Yongjun,
Zhao Yong,
Qi Kai,
Chen Yuyong
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202000194
Subject(s) - materials science , alloy , porosity , titanium aluminide , metallurgy , ultimate tensile strength , titanium alloy , scanning electron microscope , cathode ray , titanium , composite material , intermetallic , electron , physics , quantum mechanics
Selective electron beam melting (SEBM) is a promising method to manufacture complex titanium aluminide (TiAl) alloy parts. Herein, the effects of beam current, scanning speed and energy density on surface appearance, porosity, and Al loss of Ti–47Al–2Cr–2Nb alloy samples fabricated by SEBM are investigated systematically. The porosity decreased initially and then increased, and Al loss increased gradually with an increase in beam current. The porosity increased continuously and the Al loss decreased gradually with an increase in scanning velocity. The tensile strength decreased when the porosity of SEBM‐produced TiAl alloy increased. The processing window for Ti–47Al–2Cr–2Nb alloy fabricated by SEBM is determined from the energy density and scanning speed, and the formation mechanisms of small pores and B2 phase precipitation around partially melted powder are explained in detail. The findings provide a valuable reference for fabricating Ti–47Al–2Cr–2Nb alloy by SEBM with a desired surface appearance, porosity and Al loss.