Pańcikiewicz Krzysztof
Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, A. Mickiewicza 30, 30-059 Kraków, Poland.
Materials (Basel). 2021 Nov 8;14(21):6725. doi: 10.3390/ma14216725.
The production of large-size elements using additive manufacturing is a constantly evolving field that includes technological and material solutions. There is a need for a detailed analysis of the process and the products thus manufactured. In line with this trend, the flux-cored wire arc additive manufactured process and the part made of 18Ni-12Co-4Mo-Ti maraging steel were examined. The interpass temperature below 150 °C, the variation of the starting point and the gas flow of 12 L/min with a pre-flow of 2 s ensure the correct shape of the layers. The manufactured part underwent chemical composition analysis, macro- and microscopic examination and hardness measurements; in addition thermodynamic calculations were performed. The part is divided into a light-etched area (bottom part of the sample) with a hardness of 375 ± 12 HV10 and a dark-etched area (top part of the sample) with a hardness of 525 ± 11 HV10. Microscopic observations in the last layers showed supersaturated martensite with primary precipitates of μ-phase intermetallic compounds in intercellular spaces. In the earlier layers aging martensite with austenite and primary precipitates of intermetallic compounds were revealed. The share of austenite was 11.435 ± 1.313%.
使用增材制造生产大型部件是一个不断发展的领域，其中包括技术和材料解决方案。因此，需要对该工艺以及由此制造的产品进行详细分析。顺应这一趋势，对药芯焊丝电弧增材制造工艺以及由18Ni-12Co-4Mo-Ti马氏体时效钢制成的部件进行了研究。层间温度低于150°C、起始点的变化以及12L/min的气体流量和2s的预吹气确保了各层的正确形状。对制造的部件进行了化学成分分析、宏观和微观检查以及硬度测量；此外还进行了热力学计算。该部件分为一个硬度为375±12 HV10的轻蚀刻区域（样品底部）和一个硬度为525±11 HV10的暗蚀刻区域（样品顶部）。最后几层的微观观察显示，胞间空间存在过饱和马氏体以及μ相金属间化合物的初生析出物。在较早的层中，发现了含有奥氏体和金属间化合物初生析出物的时效马氏体。奥氏体的占比为11.435±1.313%。
