University of Science & Technology Beijing, Beijing 100083, China
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DOI:
10.7502/j.issn.1674-3962.2015.02.02
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Abstract:
Additive manufacturing (3D printing) holds strong potential for the production of a new class of TiAl alloys. In the present paper, recent research progress on the processing TiAl alloys by electron beam melting was reviewed. The EBM parameters such as layer thickness, melting temperature, scanning speed, line energy, or building strategy were set up to minimize porosity and achieve a homogeneous specimen with less Al loss. The very fine microstructure resulting after EBM can be then set up by HIP and heat treatment(HT). According to the HT temperature in particular, an equiaxed microstructure, a duplex microstructure with different lamellar radio and a fully lamellar microstructure were obtained. Summary remarks were presented on the advantageous aspects of EBM and the prospect of this technique also.