Polozov Igor, Kantyukov Artem, Goncharov Ivan, Razumov Nikolay, Silin Alexey, Popovich Vera, Zhu Jia-Ning, Popovich Anatoly
Peter the Great St. Petersburg Polytechnic University, Polytechnicheskaya 29, 195251 St. Petersburg, Russia.
Department of Materials Science and Engineering, Delft University of Technology, 2628 Delft, The Netherlands.
Materials (Basel). 2020 Sep 7;13(18):3952. doi: 10.3390/ma13183952.
In this paper, laser powder-bed fusion (L-PBF) additive manufacturing (AM) with a high-temperature inductive platform preheating was used to fabricate intermetallic TiAl-alloy samples. The gas atomized (GA) and mechanically alloyed plasma spheroidized (MAPS) powders of the Ti-48Al-2Cr-2Nb (at. %) alloy were used as the feedstock material. The effects of L-PBF process parameters-platform preheating temperature-on the relative density, microstructure, phase composition, and mechanical properties of printed material were evaluated. Crack-free intermetallic samples with a high relative density of 99.9% were fabricated using 900 °C preheating temperature. Scanning electron microscopy and X-Ray diffraction analyses revealed a very fine microstructure consisting of lamellar α/γ colonies, equiaxed γ grains, and retained β phase. Compressive tests showed superior properties of AM material as compared to the conventional TiAl-alloy. However, increased oxygen content was detected in MAPS powder compared to GA powder (~1.1 wt. % and ~0.1 wt. %, respectively), which resulted in lower compressive strength and strain, but higher microhardness compared to the samples produced from GA powder.
在本文中，采用带有高温感应平台预热的激光粉末床熔融（L-PBF）增材制造（AM）技术制备金属间化合物TiAl合金样品。Ti-48Al-2Cr-2Nb（原子百分比）合金的气雾化（GA）粉末和机械合金化等离子体球化（MAPS）粉末用作原料。评估了L-PBF工艺参数——平台预热温度——对打印材料的相对密度、微观结构、相组成和力学性能的影响。使用900°C预热温度制备出了相对密度高达99.9%的无裂纹金属间化合物样品。扫描电子显微镜和X射线衍射分析表明，其微观结构非常精细，由层片状α/γ晶团、等轴γ晶粒和残留β相组成。压缩试验表明，与传统TiAl合金相比，增材制造材料具有优异的性能。然而，与GA粉末相比，MAPS粉末中的氧含量有所增加（分别约为1.1 wt.%和0.1 wt.%），这导致与由GA粉末制成的样品相比，其压缩强度和应变较低，但显微硬度较高。
