Operando X-ray diffraction during laser 3D printing

被引：0
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作者：
Hocine, Samy [1 ,2 ]
Van Swygenhoven, Helena [1 ,2 ]
Van Petegem, Steven [1 ]
Chang, Cynthia Sin Ting [1 ]
Maimaitiyili, Tuerdi [1 ]
Tinti, Gemma [3 ]
Ferreira Sanchez, Dario [4 ]
Grolimund, Daniel [4 ]
Casati, Nicola [5 ]
机构：
[1] Photons for Engineering and Manufacturing, Paul Scherrer Institut, Forschungsstrasse 111, Villigen PSI,5232, Switzerland
[2] Neutrons and X-rays for Mechanics of Materials, IMX, École Polytechnique Fédérale de Lausanne, Route Cantonale, Lausanne,1015, Switzerland
[3] SLS Detectors Group, Paul Scherrer Institut, Forschungsstrasse 111, Villigen PSI,5232, Switzerland
[4] MicroXAS Beamline, Paul Scherrer Institut, Forschungsstrasse 111, Villigen PSI,5232, Switzerland
[5] Materials Science Beamline, Paul Scherrer Institut, Forschungsstrasse 111, Villigen PSI,5232, Switzerland
来源：
Materials Today | 2020年 / 34卷
关键词：
Laser based additive manufacturing allows to build a designed shape layer-by-layer; offering versatility and flexibility to many metallurgical sectors. The fast cooling rates and repeated heat cycles depending on the laser and scanning parameters are not easily measurable with conventional methods. Thus; advanced predictive computational simulations; required to reduce trial and error lead time; are difficult to validate. A newly developed in operando X-ray diffraction device implemented at a synchrotron beamline; taking advantage of the high brilliance and the fast detectors available; brings the missing link with numerical methods. By performing operando experiments on Ti-6Al-4V with different printing parameters; the temporal evolution of the low and high temperature phases are followed; the heating and cooling rates are measured for the powder and the solid material; and the formation of residual stresses in the β phase is demonstrated. Moreover it is shown that the parameter that has the largest influence on the evolving microstructure is the scanning strategy; introducing a size effect related to the scanning length. © 2019 The Authors;
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