Microstructure stability of γ-TiAl produced by selective laser melting

被引：51
|
作者：
Gussone, J. [1 ]
Garces, G. [2 ]
Haubrich, J. [1 ]
Stark, A. [3 ]
Hagedorn, Y. -C. [4 ]
Schell, N. [3 ]
Requena, G. [1 ,5 ]
机构：
[1] German Aerosp Ctr, Inst Mat Res, Dept Met & Hybrid Mat, D-51147 Cologne, Germany
[2] CSIC, Natl Ctr Met Res, CENIM, Dept Met Phys, Avda Gregorio del Amo 8, Madrid 28040, Spain
[3] Helmholtz Zentrum Geesthacht, Inst Mat Res, Max Planck Str 1, D-21502 Geesthacht, Germany
[4] Fraunhofer Inst Laser Technol, Steinbachstr 15, D-52074 Aachen, Germany
[5] Rhein Westfal TH Aachen, D-52062 Aachen, Germany
来源：
SCRIPTA MATERIALIA | 2017年 / 130卷
关键词：
Selective laser melting; X-ray diffraction; Titanium aluminides; Phase transformation; MECHANICAL-PROPERTIES; ALPHA-PHASE; IN-SITU; ALLOYS; TRANSFORMATIONS; EVOLUTION;
D O I：
10.1016/j.scriptamat.2016.11.028
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effects of intrinsic heat-treatment during selective laser melting of Ti-44.8A1-6Nb-1.0Mo-0.1B are studied and compared to extrinsic post-annealing. Phase evolution during heat-treatment of as-built samples studied by in situ synchrotron radiation diffraction showed pronounced intensity changes and peak shifts below the eutectoid temperature, which are explained by stabilization of alpha(2) as well as transformations to gamma and beta/beta(o). These observations contrast the marginal intensity changes found for the microstructure thermodynamically stabilized by hot isostatic pressing. The intrinsic heat-treatment of the as-built state leads to graded microstructures characterized by an increase of globular gamma and beta/beta(o) at the alpha(2)/gamma colony boundaries. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：110 / 113
页数：4
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