Electron beam melting of Ti-48Al-2Cr-2Nb alloy: Microstructure and mechanical properties investigation
Electron beam melting of Ti-48Al-2Cr-2Nb alloy: Microstructure and mechanical properties investigation
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DOI：
10.1016/j.intermet.2010.11.017
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发表时间：
2011-06-01
期刊：
影响因子：
4.4
通讯作者：
Badini, C.
中科院分区：
文献类型：
--
作者：
Biamino, S.;Penna, A.;Badini, C.
气体雾化Ti-48 Al-2Cr-2Nb粉末已被用作前体材料，以评估用于生产航空发动机领域中使用的近净形γ-TiAl试样的增材制造。特别地，电子束熔化（EBM）用于通过按照CAD设计以分层方式熔化金属粉末来实现金属粉末的选择性致密化。研究了EBM后和热处理后试样的显微组织、残余孔隙率和化学成分。已经观察到样品的高均匀性，相对于起始粉末的杂质（氧和氮）的非常低的拾取，并且由于EBM工艺固有的极低水平的内部缺陷，EBM γ-TiAl的拉伸性能看起来非常一致，具有小的分散。(C)2010爱思唯尔有限公司保留所有权利。
Gas atomized Ti-48Al-2Cr-2Nb powders have been used as precursor material in order to evaluate additive manufacturing for the production of near-net-shape gamma-TiAl specimens to be employed in the field of aero-engines. In particular electron beam melting (EBM) is used to realize a selective densification of metal powder by melting it in a layerwise manner following a CAD design. The microstructure, the residual porosity and the chemical composition of the samples have been investigated both immediately after EBM and after heat treatments. High homogeneity of the samples, very low pickup of impurities (oxygen and nitrogen) with respect to the starting powders have been observed and due to an extremely low level of internal defects, intrinsic to EBM process, the tensile properties of the EBM gamma-TiAl appear very consistent with a small scatter. (C) 2010 Elsevier Ltd. All rights reserved.