Švec Martin, Solfronk Pavel, Nováková Iva, Sobotka Jiří, Moravec Jaromír
Department of Engineering Technology, Faculty of Mechanical Engineering, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic.
Materials (Basel). 2023 Jul 31;16(15):5382. doi: 10.3390/ma16155382.
The nickel-iron-based alloy Inconel 718 is a progressive material with very good mechanical properties at elevated and lower temperatures. It is used both as wrought and cast alloys as well as material for additive manufacturing technologies. This is the reason why it has received so much attention, as supported by numerous publications. However, these are almost exclusively focused on a specific type of production and processing, and thus only report differences in the mechanical properties between samples prepared by different technologies. Therefore, the major aim of this research was to show how the structure and mechanical properties differ between samples produced by conventional production (wrought alloy) and additively manufactured SLM (Selective Laser Melting). It is shown that by applying appropriate heat treatment, similar strength properties at room and elevated temperatures can be achieved for SLM samples as for wrought samples. In addition, the mechanical properties are also tested up to a temperature of 900 °C, in contrast to the results published so far. Furthermore, it is proven that the microstructures of the wrought (here rolled) and SLM alloys differ significantly both in terms of grain shape and the size and distribution of precipitates.
镍铁基合金因科镍合金718是一种先进材料，在高温和低温下均具有非常良好的机械性能。它既用作锻造和铸造合金，也用作增材制造技术的材料。这就是它受到如此多关注的原因，众多出版物都支持这一点。然而，这些几乎都只专注于特定类型的生产和加工，因此只报告了不同技术制备的样品之间机械性能的差异。因此，本研究的主要目的是展示传统生产（锻造合金）和增材制造的选择性激光熔化（SLM）所生产的样品在结构和机械性能上有何不同。结果表明，通过进行适当的热处理，SLM样品在室温和高温下可以获得与锻造样品相似的强度性能。此外，与迄今为止发表的结果不同，还对高达900℃的温度下的机械性能进行了测试。此外，还证明了锻造（此处为轧制）合金和SLM合金的微观结构在晶粒形状以及析出物的尺寸和分布方面存在显著差异。
