Electron Beam Melting of Ti-48Al-2Nb-0.7Cr-0.3Si: Feasibility investigation
Electron Beam Melting of Ti-48Al-2Nb-0.7Cr-0.3Si: Feasibility investigation
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DOI：
10.1016/j.intermet.2016.03.001
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发表时间：
2016-06-01
期刊：
影响因子：
4.4
通讯作者：
Badini, Claudio
中科院分区：
文献类型：
--
作者：
Baudana, Giorgio;Biamino, Sara;Badini, Claudio
在这项工作中，在欧洲项目TIALCHARGER中进行，Ti-48Al-2Nb-0.7Cr-0.3Si的钛基粉末被用于电子束熔化（EBM）制造空心涡轮增压器涡轮的样品和原型。这种增材制造技术使用电子束，根据CAD数据有选择地逐层熔化粉末来生成零件。用这些粉末生产的部件在残余缺陷方面进行了表征，并在总体残余孔隙率和最大缺陷尺寸方面得到了适当的结果。进一步研究了材料的显微组织，并进行了热处理以获得理想的显微组织。这是这些材料的关键，因为它们的机械性能对微观结构非常敏感。分析了粉末和块状物料的化学成分。观察到铝的损失，而杂质水平非常低，粉末和零件相似。对热处理后的样品进行了力学测试，结果与文献数据非常吻合，该TiAl合金适用于所需的汽车应用。(C) 2016 Elsevier Ltd.版权所有。
In this work, carried out within the European project TIALCHARGER, TiAl-based powders of Ti-48Al-2Nb-0.7Cr-0.3Si, were used to fabricate specimens and prototypes of hollow turbocharger turbines by Electron Beam Melting (EBM). This additive manufacturing technology uses an electron beam to generate parts by selectively melting the powders layer by layer according to CAD data. Components produced with these powders were characterized in terms of residual defects and resulted appropriate both in terms of overall residual porosity and maximum defect size. Furthermore the microstructure of the as produced material was investigated and heat treatments were set up in order to obtain the desired microstructure. This is an essential point for these materials because their mechanical properties are extremely sensitive to microstructure. Chemical composition of powders and massive materials were analysed. Loss of Al was observed, while the levels of impurities were very low and similar for both the powder and the part. Mechanical tests were performed on the heat treated samples and the results are in well agreement with literature data for this TiAl alloy for the desired automotive application. (C) 2016 Elsevier Ltd. All rights reserved.